diff --git a/.travis.yml b/.travis.yml
index 8595c67..2f2c6cd 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,10 +11,7 @@ node_js:
 branches:
   only:
     - master
-    - assertron
     - /^greenkeeper.*$/
-  # except:
-  #   - /^v\d+\.\d+\.\d+$/
 before_install:
   - npm install -g greenkeeper-lockfile@1
 
@@ -26,5 +23,5 @@ script:
 after_script: greenkeeper-lockfile-upload
 
 after_success:
-  - npm install coveralls && npm run coveralls
-  - npm run semantic-release
+  - npm run travis-deploy-once "npm run semantic-release"
+  - npm install --no-save coveralls && npm run coveralls
diff --git a/README.md b/README.md
index dfe0f65..a49f022 100644
--- a/README.md
+++ b/README.md
@@ -9,13 +9,13 @@
 
 Manage and generate artifacts to test data across boundaries.
 
-## createSatisfier(expecter)
+## createSatisfier(expectation)
 
-Each property in `expecter` can be a value, a `RegExp`, or a predicate function.
+Each property in `expectation` can be a value, a `RegExp`, or a predicate function.
 
 ### test(actual)
 
-test `actual` against `expecter`.
+test `actual` against `expectation`.
 
 ```ts
 import { createSatisfier } from 'satisfier'
@@ -32,44 +32,32 @@ createSatisfier({ a: /boo/ }).test({ a: 'foo' })
 createSatisfier({ a: () => false }).test({ a: 1 })
 ```
 
-## exec(actual)
+### exec(actual)
 
-check `actual` against `expecter` and returns the checking result.
+check `actual` against `expectation` and returns the checking result.
 If `actual` meets the criteria, returns `null`.
 
 ```ts
 import { createSatisfier } from 'satisfier'
 
-// these returns null
+// returns undefined
 createSatisfier({ a: 1 }).exec({ a: 1, b: 2 })
 createSatisfier({ a: /foo/ }).exec({ a: 'foo', b: 'boo' })
 createSatisfier({ a: n => n === 1 }).exec({ a: 1, b, 2 })
 
-// [{ path: ['a'], expected: 1, actual: 2}]
+// returns [{ path: ['a'], expected: 1, actual: 2}]
 createSatisfier({ a: 1 }).exec({ a: 2 })
 
-// [{ path: ['b'], expected: 2, actual: undefined}]
+// returns [{ path: ['b'], expected: 2, actual: undefined}]
 createSatisfier({ a: 1, b: 2 }).exec({ a: 1 })
 
-// [{ path: ['a'], expected: /boo/, actual: 'foo'}]
+// returns [{ path: ['a'], expected: /boo/, actual: 'foo'}]
 createSatisfier({ a: /boo/ }).exec({ a: 'foo' })
 
-// [{ path: ['a'], expected: 'a => a === 1', actual: 2}]
+// returns [{ path: ['a'], expected: 'a => a === 1', actual: 2}]
 createSatisfier({ a: a => a === 1 }).exec({ a: 2 })
 ```
 
-## Satisfier
-
-This is identical to `createSatisfier()`, but as a class.
-
-```ts
-import { Satisfier } from 'satisfier'
-
-const s = new Satisfier({...})
-s.test(...)
-s.exec(...)
-```
-
 ## Build in predicates
 
 There are a few predicates shipped in the package for convenience.
@@ -87,6 +75,24 @@ results[0].expected.tersify()
 tersify(results[0])
 ```
 
+## spy(fn)
+
+You can use `spy(fn)` to spy on function and record the calls.
+It support 3 main case of async functions.
+They are all converted to Promise syntax so you can get the result using `call[n].then(...)`
+
+```ts
+import { spy } from 'satisfier'
+
+spy((a, b, cb) => { cb(a + 1, b - 1) })
+spy((options) => { options.success() })
+const spied = spy((a) => Promise.resolve(a + 1))
+await spied.fn(1)
+const callRecord = spied.calls[0]
+t.is(callRecord.arguments[0], 1)
+callRecord.then(result => t.is(result, 2))
+```
+
 ## Contribute
 
 ```sh
diff --git a/package-lock.json b/package-lock.json
index 2e799cb..8745d6e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -100,7 +100,7 @@
       "dev": true,
       "requires": {
         "@semantic-release/error": "2.1.0",
-        "github": "13.0.1",
+        "github": "13.1.0",
         "parse-github-url": "1.0.2",
         "travis-deploy-once": "4.3.0"
       }
@@ -112,18 +112,18 @@
       "dev": true
     },
     "@semantic-release/github": {
-      "version": "2.2.3",
-      "resolved": "https://registry.npmjs.org/@semantic-release/github/-/github-2.2.3.tgz",
-      "integrity": "sha512-tmZLX1hiTpe3Osfkn4qYEdx3zz9TIeM3SoE40lN9588ay1GODzfyjt5sCOnD0t10iLA/+T/GxDwuKCi3VzdbGA==",
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/@semantic-release/github/-/github-3.0.1.tgz",
+      "integrity": "sha512-g1Bw02uc+tICeOw7Dkbu9lTmphf1TFmFyGV28GC6H3rap9cvAPR1ceaUNJLUCHG6C/X0quD+SyZ5drAzaTzTzw==",
       "dev": true,
       "requires": {
         "@semantic-release/error": "2.1.0",
         "debug": "3.1.0",
         "fs-extra": "5.0.0",
-        "github": "13.0.1",
+        "github": "13.1.0",
         "globby": "7.1.1",
         "lodash": "4.17.4",
-        "mime": "2.1.0",
+        "mime": "2.2.0",
         "p-reduce": "1.0.0",
         "parse-github-url": "1.0.2",
         "url-join": "2.0.2"
@@ -258,9 +258,9 @@
       "dev": true
     },
     "@types/node": {
-      "version": "8.0.47",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-8.0.47.tgz",
-      "integrity": "sha512-kOwL746WVvt/9Phf6/JgX/bsGQvbrK5iUgzyfwZNcKVFcjAUVSpF9HxevLTld2SG9aywYHOILj38arDdY1r/iQ==",
+      "version": "8.5.8",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-8.5.8.tgz",
+      "integrity": "sha512-8KmlRxwbKZfjUHFIt3q8TF5S2B+/E5BaAoo/3mgc5h6FJzqxXkCK/VMetO+IRDtwtU6HUvovHMBn+XRj7SV9Qg==",
       "dev": true
     },
     "JSONStream": {
@@ -274,9 +274,9 @@
       }
     },
     "acorn": {
-      "version": "5.1.2",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.1.2.tgz",
-      "integrity": "sha512-o96FZLJBPY1lvTuJylGA9Bk3t/GKPPJG8H0ydQQl01crzwJgspa4AEIq/pVTXigmK0PHVQhiAtn8WMBLL9D2WA==",
+      "version": "5.3.0",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.3.0.tgz",
+      "integrity": "sha512-Yej+zOJ1Dm/IMZzzj78OntP/r3zHEaKcyNoU2lAaxPtrseM6rF0xwqoz5Q5ysAiED9hTjI2hgtvLXitlCN1/Ug==",
       "dev": true
     },
     "acorn-jsx": {
@@ -306,9 +306,9 @@
       }
     },
     "ajv": {
-      "version": "5.3.0",
-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-5.3.0.tgz",
-      "integrity": "sha1-RBT/dKUIecII7l/cgm4ywwNUnto=",
+      "version": "5.5.2",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-5.5.2.tgz",
+      "integrity": "sha1-c7Xuyj+rZT49P5Qis0GtQiBdyWU=",
       "dev": true,
       "requires": {
         "co": "4.6.0",
@@ -318,9 +318,9 @@
       }
     },
     "ajv-keywords": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-2.1.0.tgz",
-      "integrity": "sha1-opbhf3v658HOT34N5T0pyzIWLfA=",
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-2.1.1.tgz",
+      "integrity": "sha1-YXmX/F9gV2iUxDX5QNgZ4TW4B2I=",
       "dev": true
     },
     "align-text": {
@@ -498,10 +498,13 @@
       "dev": true
     },
     "async": {
-      "version": "1.5.2",
-      "resolved": "https://registry.npmjs.org/async/-/async-1.5.2.tgz",
-      "integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=",
-      "dev": true
+      "version": "2.6.0",
+      "resolved": "https://registry.npmjs.org/async/-/async-2.6.0.tgz",
+      "integrity": "sha512-xAfGg1/NTLBBKlHFmnd7PlmUW9KhVQIUuSrYem9xzFUZy13ScvtyGGejaae9iAVRiRq9+Cx7DPFaAAhCpyxyPw==",
+      "dev": true,
+      "requires": {
+        "lodash": "4.17.4"
+      }
     },
     "async-each": {
       "version": "1.0.1",
@@ -1482,10 +1485,13 @@
       "dev": true
     },
     "builtins": {
-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/builtins/-/builtins-1.0.3.tgz",
-      "integrity": "sha1-y5T662HIaWRR2zZTThQi+U8K7og=",
-      "dev": true
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/builtins/-/builtins-2.0.0.tgz",
+      "integrity": "sha512-8srrxpDx3a950BHYcbse+xMjupHHECvQYnShkoPz2ZLhTBrk/HQO6nWMh4o4ui8YYp2ourGVYXlGqFm+UYQwmA==",
+      "dev": true,
+      "requires": {
+        "semver": "5.4.1"
+      }
     },
     "cacheable-request": {
       "version": "2.1.4",
@@ -1634,6 +1640,12 @@
         "supports-color": "4.5.0"
       }
     },
+    "chardet": {
+      "version": "0.4.2",
+      "resolved": "https://registry.npmjs.org/chardet/-/chardet-0.4.2.tgz",
+      "integrity": "sha1-tUc7M9yXxCTl2Y3IfVXU2KKci/I=",
+      "dev": true
+    },
     "chokidar": {
       "version": "1.7.0",
       "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-1.7.0.tgz",
@@ -2178,6 +2190,12 @@
       "integrity": "sha1-s2nW+128E+7PUk+RsHD+7cNXzzQ=",
       "dev": true
     },
+    "defined": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/defined/-/defined-1.0.0.tgz",
+      "integrity": "sha1-yY2bzvdWdBiOEQlpFRGZ45sfppM=",
+      "dev": true
+    },
     "del": {
       "version": "2.2.2",
       "resolved": "https://registry.npmjs.org/del/-/del-2.2.2.tgz",
@@ -2238,70 +2256,21 @@
       "optional": true
     },
     "dependency-check": {
-      "version": "2.9.1",
-      "resolved": "https://registry.npmjs.org/dependency-check/-/dependency-check-2.9.1.tgz",
-      "integrity": "sha1-Iovbp2jjv4GaKmjDbz9qdzxCbr8=",
+      "version": "2.9.2",
+      "resolved": "https://registry.npmjs.org/dependency-check/-/dependency-check-2.9.2.tgz",
+      "integrity": "sha1-U3aI20osUpxJ8YPMKY+00X0e9DM=",
       "dev": true,
       "requires": {
-        "async": "2.5.0",
-        "builtins": "1.0.3",
+        "async": "2.6.0",
+        "builtins": "2.0.0",
         "debug": "2.6.9",
-        "detective": "4.5.0",
+        "detective": "4.7.1",
         "is-relative": "0.2.1",
         "minimist": "1.2.0",
-        "read-package-json": "2.0.12",
-        "resolve": "1.4.0"
+        "read-package-json": "2.0.10",
+        "resolve": "1.5.0"
       },
       "dependencies": {
-        "acorn": {
-          "version": "4.0.13",
-          "resolved": "https://registry.npmjs.org/acorn/-/acorn-4.0.13.tgz",
-          "integrity": "sha1-EFSVrlNh1pe9GVyCUZLhrX8lN4c=",
-          "dev": true
-        },
-        "async": {
-          "version": "2.5.0",
-          "resolved": "https://registry.npmjs.org/async/-/async-2.5.0.tgz",
-          "integrity": "sha512-e+lJAJeNWuPCNyxZKOBdaJGyLGHugXVQtrAwtuAe2vhxTYxFTKE73p8JuTmdH0qdQZtDvI4dhJwjZc5zsfIsYw==",
-          "dev": true,
-          "requires": {
-            "lodash": "4.17.4"
-          }
-        },
-        "balanced-match": {
-          "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
-          "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
-          "dev": true
-        },
-        "brace-expansion": {
-          "version": "1.1.8",
-          "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.8.tgz",
-          "integrity": "sha1-wHshHHyVLsH479Uad+8NHTmQopI=",
-          "dev": true,
-          "requires": {
-            "balanced-match": "1.0.0",
-            "concat-map": "0.0.1"
-          }
-        },
-        "builtin-modules": {
-          "version": "1.1.1",
-          "resolved": "https://registry.npmjs.org/builtin-modules/-/builtin-modules-1.1.1.tgz",
-          "integrity": "sha1-Jw8HbFpywC9bZaR9+Uxf46J4iS8=",
-          "dev": true
-        },
-        "builtins": {
-          "version": "1.0.3",
-          "resolved": "https://registry.npmjs.org/builtins/-/builtins-1.0.3.tgz",
-          "integrity": "sha1-y5T662HIaWRR2zZTThQi+U8K7og=",
-          "dev": true
-        },
-        "concat-map": {
-          "version": "0.0.1",
-          "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
-          "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
-          "dev": true
-        },
         "debug": {
           "version": "2.6.9",
           "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
@@ -2311,228 +2280,11 @@
             "ms": "2.0.0"
           }
         },
-        "defined": {
-          "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/defined/-/defined-1.0.0.tgz",
-          "integrity": "sha1-yY2bzvdWdBiOEQlpFRGZ45sfppM=",
-          "dev": true
-        },
-        "detective": {
-          "version": "4.5.0",
-          "resolved": "https://registry.npmjs.org/detective/-/detective-4.5.0.tgz",
-          "integrity": "sha1-blqMaybmx6JUsca210kNmOyR7dE=",
-          "dev": true,
-          "requires": {
-            "acorn": "4.0.13",
-            "defined": "1.0.0"
-          }
-        },
-        "fs.realpath": {
-          "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/fs.realpath/-/fs.realpath-1.0.0.tgz",
-          "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8=",
-          "dev": true
-        },
-        "glob": {
-          "version": "7.1.2",
-          "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.2.tgz",
-          "integrity": "sha512-MJTUg1kjuLeQCJ+ccE4Vpa6kKVXkPYJ2mOCQyUuKLcLQsdrMCpBPUi8qVE6+YuaJkozeA9NusTAw3hLr8Xe5EQ==",
-          "dev": true,
-          "requires": {
-            "fs.realpath": "1.0.0",
-            "inflight": "1.0.6",
-            "inherits": "2.0.3",
-            "minimatch": "3.0.4",
-            "once": "1.4.0",
-            "path-is-absolute": "1.0.1"
-          }
-        },
-        "graceful-fs": {
-          "version": "4.1.11",
-          "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.1.11.tgz",
-          "integrity": "sha1-Dovf5NHduIVNZOBOp8AOKgJuVlg=",
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               "dev": true
             },
             "strip-ansi": {
               "version": "4.0.0",
-              "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
-              "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
+              "bundled": true,
               "dev": true,
               "requires": {
                 "ansi-regex": "3.0.0"
@@ -7295,8 +6903,7 @@
         },
         "strip-ansi": {
           "version": "3.0.1",
-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
-          "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
+          "bundled": true,
           "dev": true,
           "requires": {
             "ansi-regex": "2.1.1"
@@ -7304,8 +6911,7 @@
         },
         "strip-bom": {
           "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/strip-bom/-/strip-bom-2.0.0.tgz",
-          "integrity": "sha1-YhmoVhZSBJHzV4i9vxRHqZx+aw4=",
+          "bundled": true,
           "dev": true,
           "requires": {
             "is-utf8": "0.2.1"
@@ -7313,20 +6919,17 @@
         },
         "strip-eof": {
           "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/strip-eof/-/strip-eof-1.0.0.tgz",
-          "integrity": "sha1-u0P/VZim6wXYm1n80SnJgzE2Br8=",
+          "bundled": true,
           "dev": true
         },
         "supports-color": {
           "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
-          "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc=",
+          "bundled": true,
           "dev": true
         },
         "test-exclude": {
           "version": "4.1.1",
-          "resolved": "https://registry.npmjs.org/test-exclude/-/test-exclude-4.1.1.tgz",
-          "integrity": "sha512-35+Asrsk3XHJDBgf/VRFexPgh3UyETv8IAn/LRTiZjVy6rjPVqdEk8dJcJYBzl1w0XCJM48lvTy8SfEsCWS4nA==",
+          "bundled": true,
           "dev": true,
           "requires": {
             "arrify": "1.0.1",
@@ -7338,20 +6941,17 @@
         },
         "to-fast-properties": {
           "version": "1.0.3",
-          "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-1.0.3.tgz",
-          "integrity": "sha1-uDVx+k2MJbguIxsG46MFXeTKGkc=",
+          "bundled": true,
           "dev": true
         },
         "trim-right": {
           "version": "1.0.1",
-          "resolved": "https://registry.npmjs.org/trim-right/-/trim-right-1.0.1.tgz",
-          "integrity": "sha1-yy4SAwZ+DI3h9hQJS5/kVwTqYAM=",
+          "bundled": true,
           "dev": true
         },
         "uglify-js": {
           "version": "2.8.29",
-          "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-2.8.29.tgz",
-          "integrity": "sha1-KcVzMUgFe7Th913zW3qcty5qWd0=",
+          "bundled": true,
           "dev": true,
           "optional": true,
           "requires": {
@@ -7362,8 +6962,7 @@
           "dependencies": {
             "yargs": {
               "version": "3.10.0",
-              "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.10.0.tgz",
-              "integrity": "sha1-9+572FfdfB0tOMDnTvvWgdFDH9E=",
+              "bundled": true,
               "dev": true,
               "optional": true,
               "requires": {
@@ -7377,15 +6976,13 @@
         },
         "uglify-to-browserify": {
           "version": "1.0.2",
-          "resolved": "https://registry.npmjs.org/uglify-to-browserify/-/uglify-to-browserify-1.0.2.tgz",
-          "integrity": "sha1-bgkk1r2mta/jSeOabWMoUKD4grc=",
+          "bundled": true,
           "dev": true,
           "optional": true
         },
         "validate-npm-package-license": {
           "version": "3.0.1",
-          "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.1.tgz",
-          "integrity": "sha1-KAS6vnEq0zeUWaz74kdGqywwP7w=",
+          "bundled": true,
           "dev": true,
           "requires": {
             "spdx-correct": "1.0.2",
@@ -7394,8 +6991,7 @@
         },
         "which": {
           "version": "1.3.0",
-          "resolved": "https://registry.npmjs.org/which/-/which-1.3.0.tgz",
-          "integrity": "sha512-xcJpopdamTuY5duC/KnTTNBraPK54YwpenP4lzxU8H91GudWpFv38u0CKjclE1Wi2EH2EDz5LRcHcKbCIzqGyg==",
+          "bundled": true,
           "dev": true,
           "requires": {
             "isexe": "2.0.0"
@@ -7403,27 +6999,23 @@
         },
         "which-module": {
           "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
-          "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
+          "bundled": true,
           "dev": true
         },
         "window-size": {
           "version": "0.1.0",
-          "resolved": "https://registry.npmjs.org/window-size/-/window-size-0.1.0.tgz",
-          "integrity": "sha1-VDjNLqk7IC76Ohn+iIeu58lPnJ0=",
+          "bundled": true,
           "dev": true,
           "optional": true
         },
         "wordwrap": {
           "version": "0.0.3",
-          "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.3.tgz",
-          "integrity": "sha1-o9XabNXAvAAI03I0u68b7WMFkQc=",
+          "bundled": true,
           "dev": true
         },
         "wrap-ansi": {
           "version": "2.1.0",
-          "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
-          "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
+          "bundled": true,
           "dev": true,
           "requires": {
             "string-width": "1.0.2",
@@ -7432,8 +7024,7 @@
           "dependencies": {
             "string-width": {
               "version": "1.0.2",
-              "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
-              "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
+              "bundled": true,
               "dev": true,
               "requires": {
                 "code-point-at": "1.1.0",
@@ -7445,14 +7036,12 @@
         },
         "wrappy": {
           "version": "1.0.2",
-          "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
-          "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+          "bundled": true,
           "dev": true
         },
         "write-file-atomic": {
           "version": "1.3.4",
-          "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-1.3.4.tgz",
-          "integrity": "sha1-+Aek8LHZ6ROuekgRLmzDrxmRtF8=",
+          "bundled": true,
           "dev": true,
           "requires": {
             "graceful-fs": "4.1.11",
@@ -7462,20 +7051,17 @@
         },
         "y18n": {
           "version": "3.2.1",
-          "resolved": "https://registry.npmjs.org/y18n/-/y18n-3.2.1.tgz",
-          "integrity": "sha1-bRX7qITAhnnA136I53WegR4H+kE=",
+          "bundled": true,
           "dev": true
         },
         "yallist": {
           "version": "2.1.2",
-          "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
-          "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
+          "bundled": true,
           "dev": true
         },
         "yargs": {
           "version": "10.0.3",
-          "resolved": "https://registry.npmjs.org/yargs/-/yargs-10.0.3.tgz",
-          "integrity": "sha512-DqBpQ8NAUX4GyPP/ijDGHsJya4tYqLQrjPr95HNsr1YwL3+daCfvBwg7+gIC6IdJhR2kATh3hb61vjzMWEtjdw==",
+          "bundled": true,
           "dev": true,
           "requires": {
             "cliui": "3.2.0",
@@ -7494,8 +7080,7 @@
           "dependencies": {
             "cliui": {
               "version": "3.2.0",
-              "resolved": "https://registry.npmjs.org/cliui/-/cliui-3.2.0.tgz",
-              "integrity": "sha1-EgYBU3qRbSmUD5NNo7SNWFo5IT0=",
+              "bundled": true,
               "dev": true,
               "requires": {
                 "string-width": "1.0.2",
@@ -7505,8 +7090,7 @@
               "dependencies": {
                 "string-width": {
                   "version": "1.0.2",
-                  "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
-                  "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
+                  "bundled": true,
                   "dev": true,
                   "requires": {
                     "code-point-at": "1.1.0",
@@ -7520,8 +7104,7 @@
         },
         "yargs-parser": {
           "version": "8.0.0",
-          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-8.0.0.tgz",
-          "integrity": "sha1-IdR2Mw5agieaS4gTRb8GYQLiGcY=",
+          "bundled": true,
           "dev": true,
           "requires": {
             "camelcase": "4.1.0"
@@ -7529,8 +7112,7 @@
           "dependencies": {
             "camelcase": {
               "version": "4.1.0",
-              "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-4.1.0.tgz",
-              "integrity": "sha1-1UVjW+HjPFQmScaRc+Xeas+uNN0=",
+              "bundled": true,
               "dev": true
             }
           }
@@ -8061,6 +7643,18 @@
         }
       }
     },
+    "read-package-json": {
+      "version": "2.0.10",
+      "resolved": "https://registry.npmjs.org/read-package-json/-/read-package-json-2.0.10.tgz",
+      "integrity": "sha512-iNWaEs9hW9nviu5rHADmkm/Ob5dvah5zajtTS1XbyERSzkWgSwWZ6Z12bION7bEAzVc2YRFWnAz8k/tAr+5/eg==",
+      "dev": true,
+      "requires": {
+        "glob": "7.1.2",
+        "graceful-fs": "4.1.11",
+        "json-parse-helpfulerror": "1.0.3",
+        "normalize-package-data": "2.4.0"
+      }
+    },
     "read-pkg": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/read-pkg/-/read-pkg-2.0.0.tgz",
@@ -8521,15 +8115,15 @@
       "dev": true
     },
     "semantic-release": {
-      "version": "11.0.2",
-      "resolved": "https://registry.npmjs.org/semantic-release/-/semantic-release-11.0.2.tgz",
-      "integrity": "sha512-WL1drB52yPYUFIVlS2RvKu4FE3tuBM0LcKifn+RAkJ63N4ScYHbW09Vy6CWKVJ39B/Excatn3sRMnTd2jIyI3Q==",
+      "version": "11.2.0",
+      "resolved": "https://registry.npmjs.org/semantic-release/-/semantic-release-11.2.0.tgz",
+      "integrity": "sha512-gi2LGiZ2RrI+LTJt6zRMisSqbfFyxyoDdqItgwCqSG0OqANuTxnroW1ygmV1tdDMB0DKstUanPhukVMU0yUO2A==",
       "dev": true,
       "requires": {
         "@semantic-release/commit-analyzer": "5.0.0",
         "@semantic-release/condition-travis": "7.1.4",
         "@semantic-release/error": "2.1.0",
-        "@semantic-release/github": "2.2.3",
+        "@semantic-release/github": "3.0.1",
         "@semantic-release/npm": "2.6.1",
         "@semantic-release/release-notes-generator": "6.0.3",
         "chalk": "2.3.0",
@@ -8539,12 +8133,12 @@
         "execa": "0.8.0",
         "get-stream": "3.0.0",
         "git-log-parser": "1.2.0",
-        "import-from": "2.1.0",
         "lodash": "4.17.4",
-        "marked": "0.3.9",
+        "marked": "0.3.12",
         "marked-terminal": "2.0.0",
         "p-reduce": "1.0.0",
         "read-pkg-up": "3.0.0",
+        "resolve-from": "4.0.0",
         "semver": "5.4.1"
       },
       "dependencies": {
@@ -8620,6 +8214,12 @@
             "find-up": "2.1.0",
             "read-pkg": "3.0.0"
           }
+        },
+        "resolve-from": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/resolve-from/-/resolve-from-4.0.0.tgz",
+          "integrity": "sha512-pb/MYmXstAkysRFx8piNI1tGFNQIFA3vkE3Gq4EuA1dF6gHp/+vgZqsCGJapvy8N3Q+4o7FwvquPJcnZ7RYy4g==",
+          "dev": true
         }
       }
     },
@@ -8940,8 +8540,8 @@
       "integrity": "sha512-UUkEAPdSGxtRpiV9ozJ5cMTtYiqz7Ni1OGqLXRCynrvzdtR1p+cfOWe2RJLwvUG8hNanaSRjecIqwOjqeatDsA==",
       "dev": true,
       "requires": {
-        "ajv": "5.3.0",
-        "ajv-keywords": "2.1.0",
+        "ajv": "5.5.2",
+        "ajv-keywords": "2.1.1",
         "chalk": "2.3.0",
         "lodash": "4.17.4",
         "slice-ansi": "1.0.0",
@@ -9193,12 +8793,6 @@
       "integrity": "sha1-yy4SAwZ+DI3h9hQJS5/kVwTqYAM=",
       "dev": true
     },
-    "tryit": {
-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/tryit/-/tryit-1.0.3.tgz",
-      "integrity": "sha1-OTvnMKlEb9Hq1tpZoBQwjzbCics=",
-      "dev": true
-    },
     "tslib": {
       "version": "1.8.0",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.8.0.tgz",
@@ -9325,9 +8919,9 @@
       "dev": true
     },
     "typescript": {
-      "version": "2.6.1",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-2.6.1.tgz",
-      "integrity": "sha1-7znN6ierrAtQAkLWcmq5DgyEZjE=",
+      "version": "2.6.2",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-2.6.2.tgz",
+      "integrity": "sha1-PFtv1/beCRQmkCfwPAlGdY92c6Q=",
       "dev": true
     },
     "uglify-js": {
@@ -9396,6 +8990,12 @@
       "integrity": "sha1-SDEm4Rd03y9xuLY53NeZw3YWK4I=",
       "dev": true
     },
+    "unc-path-regex": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/unc-path-regex/-/unc-path-regex-0.1.2.tgz",
+      "integrity": "sha1-5z3T17DXxe2G+6xrCufYxqadUPo=",
+      "dev": true
+    },
     "unique-string": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/unique-string/-/unique-string-1.0.0.tgz",
@@ -9501,6 +9101,14 @@
       "dev": true,
       "requires": {
         "builtins": "1.0.3"
+      },
+      "dependencies": {
+        "builtins": {
+          "version": "1.0.3",
+          "resolved": "https://registry.npmjs.org/builtins/-/builtins-1.0.3.tgz",
+          "integrity": "sha1-y5T662HIaWRR2zZTThQi+U8K7og=",
+          "dev": true
+        }
       }
     },
     "verror": {
diff --git a/package.json b/package.json
index cabbde7..4609bcc 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,7 @@
     "src"
   ],
   "scripts": {
-    "build": "npm run clean && npm run build-es5 && npm run build-es2015",
+    "build": "npm run clean && npm run build-es5",
     "build-es5": "tsc -p tsconfig.es5.json",
     "build-es2015": "tsc -p tsconfig.es2015.json",
     "clean": "rimraf dist dist-es5 && rimraf dist-es2015",
@@ -24,17 +24,18 @@
     "test": "npm run clean && tsc && ava",
     "verify": "npm run lint && npm run coverage && npm run build && npm run dependency-check",
     "watch": "npm run clean && node scripts/watch.js",
-    "semantic-release": "semantic-release"
+    "semantic-release": "semantic-release",
+    "travis-deploy-once": "travis-deploy-once"
   },
   "license": "MIT",
   "repository": {
     "type": "git",
-    "url": "https://github.com/unional/assertron.git"
+    "url": "https://github.com/unional/satisfier.git"
   },
   "bugs": {
-    "url": "https://github.com/unional/assertron/issues"
+    "url": "https://github.com/unional/satisfier/issues"
   },
-  "homepage": "https://github.com/unional/assertron",
+  "homepage": "https://github.com/unional/satisfier",
   "ava": {
     "files": [
       "dist-es5/**/*.spec.js"
@@ -57,17 +58,18 @@
     "email": "homawong@gmail.com"
   },
   "devDependencies": {
-    "@types/node": "^8.0.47",
+    "@types/node": "^8.5.8",
     "ava": "^0.24.0",
-    "dependency-check": "^2.9.1",
-    "eslint": "^4.10.0",
+    "dependency-check": "^2.9.2",
+    "eslint": "^4.15.0",
     "eslint-config-unional": "^0.2.3",
-    "nyc": "^11.3.0",
+    "nyc": "^11.4.1",
     "rimraf": "^2.6.2",
-    "semantic-release": "^11.0.2",
+    "semantic-release": "^11.2.0",
+    "travis-deploy-once": "^4.3.0",
     "tslint": "^5.8.0",
     "tslint-config-unional": "^0.9.0",
-    "typescript": "^2.6.1"
+    "typescript": "^2.6.2"
   },
   "dependencies": {
     "tersify": "^0.3.0"
diff --git a/src/Satisfier.exec.spec.ts b/src/Satisfier.exec.spec.ts
deleted file mode 100644
index 3f69c91..0000000
--- a/src/Satisfier.exec.spec.ts
+++ /dev/null
@@ -1,154 +0,0 @@
-import { test } from 'ava'
-
-import { Satisfier } from './index'
-import { assertExec, assertRegExp } from './testUtil';
-
-test('primitive types without specifing generic will work without issue.', t => {
-  t.is(new Satisfier(1).exec(1), null)
-  t.is(new Satisfier(true).exec(true), null)
-  t.is(new Satisfier('a').exec('a'), null)
-})
-
-test('can use generic to specify the data structure', t => {
-  t.is(new Satisfier<number>(1).exec(1), null)
-  t.is(new Satisfier<{ a: number }>({ a: /1/ }).exec({ a: 1 }), null)
-})
-
-test('empty object expecter passes all objects', t => {
-  t.is(new Satisfier({}).exec({}), null)
-  t.is(new Satisfier({}).exec({ a: 1 }), null)
-  t.is(new Satisfier({}).exec({ a: { b: 'a' } }), null)
-  t.is(new Satisfier({}).exec({ a: true }), null)
-  t.is(new Satisfier({}).exec({ a: [1] }), null)
-})
-
-test('empty object expecter fails primitive', t => {
-  assertExec(t, new Satisfier({}).exec(1)![0], [], {}, 1)
-  assertExec(t, new Satisfier({}).exec(true)![0], [], {}, true)
-  assertExec(t, new Satisfier({}).exec('a')![0], [], {}, 'a')
-})
-
-test('mismatch value gets path, expected, and actual', t => {
-  const actual = new Satisfier({ a: 1 }).exec({ a: 2 })!
-  t.is(actual.length, 1)
-  assertExec(t, actual[0], ['a'], 1, 2)
-})
-
-test('missing property get actual as undefined', t => {
-  const actual = new Satisfier({ a: 1 }).exec({})!
-  t.is(actual.length, 1)
-  assertExec(t, actual[0], ['a'], 1, undefined)
-})
-
-test('missing property get deeper level', t => {
-  const actual = new Satisfier({ a: { b: 1 } }).exec({ a: {} })!
-  t.is(actual.length, 1)
-  assertExec(t, actual[0], ['a', 'b'], 1, undefined)
-})
-
-test('passing regex gets null', t => {
-  t.is(new Satisfier({ foo: /foo/ }).exec({ foo: 'foo' }), null)
-})
-
-test('failed regex will be in expected property', t => {
-  const actual = new Satisfier({ foo: /foo/ }).exec({ foo: 'boo' })!
-  assertRegExp(t, actual, ['foo'], /foo/, 'boo')
-})
-
-test('regex on missing property gets actual as undefined', t => {
-  const actual = new Satisfier({ foo: /foo/ }).exec({})!
-  assertRegExp(t, actual, ['foo'], /foo/, undefined)
-})
-
-test('regex on non-string will fail as normal', t => {
-  let actual = new Satisfier({ foo: /foo/ }).exec({ foo: 1 })!
-  assertRegExp(t, actual, ['foo'], /foo/, 1)
-
-  actual = new Satisfier({ foo: /foo/ }).exec({ foo: true })!
-  assertRegExp(t, actual, ['foo'], /foo/, true)
-
-  actual = new Satisfier({ foo: /foo/ }).exec({ foo: [1, true, 'a'] })!
-  assertRegExp(t, actual, ['foo'], /foo/, [1, true, 'a'])
-
-  actual = new Satisfier({ foo: /foo/ }).exec({ foo: { a: 1 } })!
-  assertRegExp(t, actual, ['foo'], /foo/, { a: 1 })
-})
-
-test('predicate receives actual value', t => {
-  t.is(new Satisfier({ a: a => a === 1 }).exec({ a: 1 }), null)
-})
-
-test('passing predicate gets null', t => {
-  t.is(new Satisfier({ a: () => true }).exec({}), null)
-  t.is(new Satisfier({ a: () => true }).exec({ a: 1 }), null)
-})
-
-test('failing predicate', t => {
-  const actual = new Satisfier({ a: function () { return false } }).exec({ a: 1 })!
-  t.is(actual.length, 1)
-  assertExec(t, actual[0], ['a'], function () { return false; }, 1)
-})
-
-test('against each element in array', t => {
-  t.is(new Satisfier({ a: 1 }).exec([{ a: 1 }, { b: 1, a: 1 }]), null)
-})
-
-test('against each element in array in deep level', t => {
-  const actual = new Satisfier({ a: { b: { c: /foo/ } } }).exec([{ a: {} }, { a: { b: {} } }, { a: { b: { c: 'boo' } } }])!
-  t.is(actual.length, 3)
-  assertExec(t, actual[0], ['[0]', 'a', 'b'], { c: /foo/ }, undefined)
-  assertExec(t, actual[1], ['[1]', 'a', 'b', 'c'], /foo/, undefined)
-  assertExec(t, actual[2], ['[2]', 'a', 'b', 'c'], /foo/, 'boo')
-})
-
-test('when apply against array, will have indices in the path', t => {
-  const actual = new Satisfier({ a: 1 }).exec([{ a: 1 }, {}])!
-  t.is(actual.length, 1)
-  assertExec(t, actual[0], ['[1]', 'a'], 1, undefined)
-})
-
-test('when Expecter is an array, will apply to each entry in the actual array', t => {
-  t.is(new Satisfier([{ a: 1 }, { b: 2 }]).exec([{ a: 1 }, { b: 2 }, { c: 3 }]), null)
-  const actual = new Satisfier([{ a: 1 }, { b: 2 }]).exec([{ a: true }, { b: 'b' }, { c: 3 }])!
-  t.is(actual.length, 2)
-  assertExec(t, actual[0], ['[0]', 'a'], 1, true)
-  assertExec(t, actual[1], ['[1]', 'b'], 2, 'b')
-})
-
-test.skip('when Expecter is an array and actual is not, the behavior is not defined yet', t => {
-  const actual = new Satisfier([{ a: 1 }, { b: 2 }]).exec({ a: 1 })!
-  t.is(actual.length, 1)
-})
-
-test('deep object checking', t => {
-  const actual = new Satisfier({ a: { b: 1 } }).exec({ a: { b: 2 } })!
-  t.is(actual.length, 1)
-  assertExec(t, actual[0], ['a', 'b'], 1, 2)
-})
-
-test('can check parent property', t => {
-  class Foo {
-    foo = 'foo'
-  }
-  class Boo extends Foo {
-    boo = 'boo'
-  }
-  const boo = new Boo()
-  t.is(new Satisfier({ foo: 'foo' }).exec(boo), null)
-})
-
-test('actual of type any should not have type checking error', t => {
-  let actual: any = { a: 1 }
-  t.is(new Satisfier({ a: 1 }).exec(actual), null)
-})
-
-test('expect array in hash', t => {
-  t.is(new Satisfier({ a: [1, true, 'a'] }).exec({ a: [1, true, 'a'] }), null)
-})
-
-test('failing array in hash', t => {
-  // console.log(Object.keys(['a', 'b', 'c']))
-  const actual = new Satisfier({ a: [1, true, 'a'] }).exec({ a: [1, true, 'b'] })!
-  t.is(actual.length, 1)
-  assertExec(t, actual[0], ['a', '[2]'], 'a', 'b')
-})
diff --git a/src/Satisfier.test.spec.ts b/src/Satisfier.test.spec.ts
deleted file mode 100644
index 2effa07..0000000
--- a/src/Satisfier.test.spec.ts
+++ /dev/null
@@ -1,24 +0,0 @@
-import { test } from 'ava'
-
-import { Satisfier } from './index'
-
-test('empty expecter passes everything', t => {
-  t.true(new Satisfier({}).test({}))
-  t.true(new Satisfier({}).test({ a: 1 }))
-  t.true(new Satisfier({}).test({ a: true }))
-  t.true(new Satisfier({}).test({ a: 'a' }))
-  t.true(new Satisfier({}).test({ a: [1, true, 'a'] }))
-  t.true(new Satisfier({}).test({ a: { b: 'a' } }))
-  t.true(new Satisfier({}).test([{}, { a: 1 }]))
-})
-
-test('mismatch value fails', t => {
-  t.false(new Satisfier({ a: 1 }).test({ a: 2 }))
-  t.false(new Satisfier({ a: true }).test({ a: false }))
-  t.false(new Satisfier({ a: 'a' }).test({ a: 'b' }))
-  t.false(new Satisfier({ a: /foo/ }).test({ a: 'b' }))
-  t.false(new Satisfier({ a: () => false }).test({ a: 'b' }))
-  t.false(new Satisfier([{ a: 1 }, { b: 2 }]).test([{ a: true }, { b: 'b' }, { c: 3 }]))
-  t.false(new Satisfier({ a: [1, true, 'a'] }).test({ a: [1, true, 'b'] }))
-  t.false(new Satisfier({ a: { b: 1 } }).test({ a: { b: 2 } }))
-})
diff --git a/src/Satisfier.ts b/src/Satisfier.ts
deleted file mode 100644
index 79020f5..0000000
--- a/src/Satisfier.ts
+++ /dev/null
@@ -1,26 +0,0 @@
-import { createSatisfier } from './createSatisfier'
-import { Expecter, Struct, SatisfierExec } from './interfaces'
-
-export class Satisfier<T extends Struct> {
-  private satisfier: {
-    test: (actual: T) => boolean;
-    exec: (actual: T) => SatisfierExec[] | null;
-  }
-  /**
-   * creates a Satisfier instance
-   * @param expected All properties can be a value which will be compared to the same property in `actual`, RegExp, or a predicate function that will be used to check against the property.
-   */
-  constructor(expected: Expecter<T>) {
-    this.satisfier = createSatisfier(expected)
-  }
-
-  test(actual: T): boolean {
-    return this.satisfier.test(actual)
-  }
-  /**
-   * Check if `actual` satisfies the expected criteria.
-   */
-  exec(actual: T): SatisfierExec[] | null {
-    return this.satisfier.exec(actual)
-  }
-}
diff --git a/src/createCallRecordCreator.ts b/src/createCallRecordCreator.ts
new file mode 100644
index 0000000..2c8741e
--- /dev/null
+++ b/src/createCallRecordCreator.ts
@@ -0,0 +1,18 @@
+import { CallRecord } from './interfaces'
+
+export function createCallRecordCreator(args: any[]) {
+  let resolve
+  let reject
+  const p = new Promise((a, r) => {
+    resolve = a
+    reject = r
+  })
+
+  return {
+    resolve,
+    reject,
+    callRecord: Object.assign(p, {
+      arguments: args
+    }) as CallRecord
+  }
+}
diff --git a/src/createSatisfier.exec.spec.ts b/src/createSatisfier.exec.spec.ts
new file mode 100644
index 0000000..4319a82
--- /dev/null
+++ b/src/createSatisfier.exec.spec.ts
@@ -0,0 +1,154 @@
+import { test } from 'ava'
+
+import { createSatisfier } from './index'
+import { assertExec, assertRegExp } from './testUtil';
+
+test('primitive types without specifing generic will work without issue.', t => {
+  t.is(createSatisfier(1).exec(1), undefined)
+  t.is(createSatisfier(true).exec(true), undefined)
+  t.is(createSatisfier('a').exec('a'), undefined)
+})
+
+test('can use generic to specify the data structure', t => {
+  t.is(createSatisfier<number>(1).exec(1), undefined)
+  t.is(createSatisfier<{ a: number }>({ a: /1/ }).exec({ a: 1 }), undefined)
+})
+
+test('empty object expecter passes all objects', t => {
+  t.is(createSatisfier({}).exec({}), undefined)
+  t.is(createSatisfier({}).exec({ a: 1 }), undefined)
+  t.is(createSatisfier({}).exec({ a: { b: 'a' } }), undefined)
+  t.is(createSatisfier({}).exec({ a: true }), undefined)
+  t.is(createSatisfier({}).exec({ a: [1] }), undefined)
+})
+
+test('empty object expecter fails primitive', t => {
+  assertExec(t, createSatisfier({}).exec(1)![0], [], {}, 1)
+  assertExec(t, createSatisfier({}).exec(true)![0], [], {}, true)
+  assertExec(t, createSatisfier({}).exec('a')![0], [], {}, 'a')
+})
+
+test('mismatch value gets path, expected, and actual', t => {
+  const actual = createSatisfier({ a: 1 }).exec({ a: 2 })!
+  t.is(actual.length, 1)
+  assertExec(t, actual[0], ['a'], 1, 2)
+})
+
+test('missing property get actual as undefined', t => {
+  const actual = createSatisfier({ a: 1 }).exec({})!
+  t.is(actual.length, 1)
+  assertExec(t, actual[0], ['a'], 1, undefined)
+})
+
+test('missing property get deeper level', t => {
+  const actual = createSatisfier({ a: { b: 1 } }).exec({ a: {} })!
+  t.is(actual.length, 1)
+  assertExec(t, actual[0], ['a', 'b'], 1, undefined)
+})
+
+test('passing regex gets undefined', t => {
+  t.is(createSatisfier({ foo: /foo/ }).exec({ foo: 'foo' }), undefined)
+})
+
+test('failed regex will be in expected property', t => {
+  const actual = createSatisfier({ foo: /foo/ }).exec({ foo: 'boo' })!
+  assertRegExp(t, actual, ['foo'], /foo/, 'boo')
+})
+
+test('regex on missing property gets actual as undefined', t => {
+  const actual = createSatisfier({ foo: /foo/ }).exec({})!
+  assertRegExp(t, actual, ['foo'], /foo/, undefined)
+})
+
+test('regex on non-string will fail as normal', t => {
+  let actual = createSatisfier({ foo: /foo/ }).exec({ foo: 1 })!
+  assertRegExp(t, actual, ['foo'], /foo/, 1)
+
+  actual = createSatisfier({ foo: /foo/ }).exec({ foo: true })!
+  assertRegExp(t, actual, ['foo'], /foo/, true)
+
+  actual = createSatisfier({ foo: /foo/ }).exec({ foo: [1, true, 'a'] })!
+  assertRegExp(t, actual, ['foo'], /foo/, [1, true, 'a'])
+
+  actual = createSatisfier({ foo: /foo/ }).exec({ foo: { a: 1 } })!
+  assertRegExp(t, actual, ['foo'], /foo/, { a: 1 })
+})
+
+test('predicate receives actual value', t => {
+  t.is(createSatisfier({ a: a => a === 1 }).exec({ a: 1 }), undefined)
+})
+
+test('passing predicate gets undefined', t => {
+  t.is(createSatisfier({ a: () => true }).exec({}), undefined)
+  t.is(createSatisfier({ a: () => true }).exec({ a: 1 }), undefined)
+})
+
+test('failing predicate', t => {
+  const actual = createSatisfier({ a: /*istanbul ignore next*/function () { return false } }).exec({ a: 1 })!
+  t.is(actual.length, 1)
+  assertExec(t, actual[0], ['a'], /*istanbul ignore next*/function () { return false; }, 1)
+})
+
+test('against each element in array', t => {
+  t.is(createSatisfier({ a: 1 }).exec([{ a: 1 }, { b: 1, a: 1 }]), undefined)
+})
+
+test('against each element in array in deep level', t => {
+  const actual = createSatisfier({ a: { b: { c: /foo/ } } }).exec([{ a: {} }, { a: { b: {} } }, { a: { b: { c: 'boo' } } }])!
+  t.is(actual.length, 3)
+  assertExec(t, actual[0], ['[0]', 'a', 'b'], { c: /foo/ }, undefined)
+  assertExec(t, actual[1], ['[1]', 'a', 'b', 'c'], /foo/, undefined)
+  assertExec(t, actual[2], ['[2]', 'a', 'b', 'c'], /foo/, 'boo')
+})
+
+test('when apply against array, will have indices in the path', t => {
+  const actual = createSatisfier({ a: 1 }).exec([{ a: 1 }, {}])!
+  t.is(actual.length, 1)
+  assertExec(t, actual[0], ['[1]', 'a'], 1, undefined)
+})
+
+test('when Expecter is an array, will apply to each entry in the actual array', t => {
+  t.is(createSatisfier([{ a: 1 }, { b: 2 }]).exec([{ a: 1 }, { b: 2 }, { c: 3 }]), undefined)
+  const actual = createSatisfier([{ a: 1 }, { b: 2 }]).exec([{ a: true }, { b: 'b' }, { c: 3 }])!
+  t.is(actual.length, 2)
+  assertExec(t, actual[0], ['[0]', 'a'], 1, true)
+  assertExec(t, actual[1], ['[1]', 'b'], 2, 'b')
+})
+
+test.skip('when Expecter is an array and actual is not, the behavior is not defined yet', t => {
+  const actual = createSatisfier([{ a: 1 }, { b: 2 }]).exec({ a: 1 })!
+  t.is(actual.length, 1)
+})
+
+test('deep object checking', t => {
+  const actual = createSatisfier({ a: { b: 1 } }).exec({ a: { b: 2 } })!
+  t.is(actual.length, 1)
+  assertExec(t, actual[0], ['a', 'b'], 1, 2)
+})
+
+test('can check parent property', t => {
+  class Foo {
+    foo = 'foo'
+  }
+  class Boo extends Foo {
+    boo = 'boo'
+  }
+  const boo = new Boo()
+  t.is(createSatisfier({ foo: 'foo' }).exec(boo), undefined)
+})
+
+test('actual of type any should not have type checking error', t => {
+  let actual: any = { a: 1 }
+  t.is(createSatisfier({ a: 1 }).exec(actual), undefined)
+})
+
+test('expect array in hash', t => {
+  t.is(createSatisfier({ a: [1, true, 'a'] }).exec({ a: [1, true, 'a'] }), undefined)
+})
+
+test('failing array in hash', t => {
+  // console.log(Object.keys(['a', 'b', 'c']))
+  const actual = createSatisfier({ a: [1, true, 'a'] }).exec({ a: [1, true, 'b'] })!
+  t.is(actual.length, 1)
+  assertExec(t, actual[0], ['a', '[2]'], 'a', 'b')
+})
diff --git a/src/createSatisfier.test.spec.ts b/src/createSatisfier.test.spec.ts
new file mode 100644
index 0000000..ef070ea
--- /dev/null
+++ b/src/createSatisfier.test.spec.ts
@@ -0,0 +1,24 @@
+import { test } from 'ava'
+
+import { createSatisfier } from './index'
+
+test('empty expecter passes everything', t => {
+  t.true(createSatisfier({}).test({}))
+  t.true(createSatisfier({}).test({ a: 1 }))
+  t.true(createSatisfier({}).test({ a: true }))
+  t.true(createSatisfier({}).test({ a: 'a' }))
+  t.true(createSatisfier({}).test({ a: [1, true, 'a'] }))
+  t.true(createSatisfier({}).test({ a: { b: 'a' } }))
+  t.true(createSatisfier({}).test([{}, { a: 1 }]))
+})
+
+test('mismatch value fails', t => {
+  t.false(createSatisfier({ a: 1 }).test({ a: 2 }))
+  t.false(createSatisfier({ a: true }).test({ a: false }))
+  t.false(createSatisfier({ a: 'a' }).test({ a: 'b' }))
+  t.false(createSatisfier({ a: /foo/ }).test({ a: 'b' }))
+  t.false(createSatisfier({ a: () => false }).test({ a: 'b' }))
+  t.false(createSatisfier([{ a: 1 }, { b: 2 }]).test([{ a: true }, { b: 'b' }, { c: 3 }]))
+  t.false(createSatisfier({ a: [1, true, 'a'] }).test({ a: [1, true, 'b'] }))
+  t.false(createSatisfier({ a: { b: 1 } }).test({ a: { b: 2 } }))
+})
diff --git a/src/createSatisfier.ts b/src/createSatisfier.ts
index c601b7e..cb46215 100644
--- a/src/createSatisfier.ts
+++ b/src/createSatisfier.ts
@@ -1,15 +1,15 @@
-import { Struct, Expecter, SatisfierExec } from './interfaces'
+import { Struct, Expectation, SatisfierExec } from './interfaces'
 
 /**
  * creates a satisfier
- * @param expected All properties can be a value which will be compared to the same property in `actual`, RegExp, or a predicate function that will be used to check against the property.
+ * @param expectation All properties can be a value which will be compared to the same property in `actual`, RegExp, or a predicate function that will be used to check against the property.
  */
-export function createSatisfier<T extends Struct>(expected: Expecter<T>): {
+export function createSatisfier<T extends Struct>(expectation: Expectation<T>): {
   test: (actual: T) => boolean;
-  exec: (actual: T) => SatisfierExec[] | null;
+  exec: (actual: T) => SatisfierExec[] | undefined;
 } {
   function test(actual: T) {
-    return exec(actual) === null
+    return exec(actual) === undefined
   }
   /**
    * Check if `actual` satisfies the expected criteria.
@@ -17,20 +17,20 @@ export function createSatisfier<T extends Struct>(expected: Expecter<T>): {
   function exec(actual: T) {
     if (Array.isArray(actual)) {
       const diff: SatisfierExec[] = []
-      if (Array.isArray(expected)) {
-        expected.forEach((e, i) => {
+      if (Array.isArray(expectation)) {
+        expectation.forEach((e, i) => {
           diff.push(...detectDiff(actual[i], e, [`[${i}]`]))
         })
       }
       else {
         actual.forEach((a, i) => {
-          diff.push(...detectDiff(a, expected, [`[${i}]`]))
+          diff.push(...detectDiff(a, expectation, [`[${i}]`]))
         })
       }
-      return diff.length === 0 ? null : diff
+      return diff.length === 0 ? undefined : diff
     }
-    const diff = detectDiff(actual, expected)
-    return diff.length === 0 ? null : diff
+    const diff = detectDiff(actual, expectation)
+    return diff.length === 0 ? undefined : diff
   }
   return {
     test,
diff --git a/src/index.ts b/src/index.ts
index dbf3902..207aeb6 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -3,5 +3,4 @@ export * from './interfaces'
 export * from './isInRange'
 export * from './isInInterval'
 export * from './isTypeOf'
-export * from './Satisfier'
 export * from './spy'
diff --git a/src/interfaces.ts b/src/interfaces.ts
index f2dbb00..af05eec 100644
--- a/src/interfaces.ts
+++ b/src/interfaces.ts
@@ -1,13 +1,31 @@
 import { Tersible } from 'tersify'
 
+export interface CallRecord extends Promise<any> {
+  arguments: any[],
+  /**
+   * Synchronous result.
+   */
+  result: any,
+  /**
+   * Synchronous error got thrown.
+   */
+  error: any
+}
+
+export interface Spec<T extends Function> {
+  spiedFn: T,
+  calls: CallRecord[],
+  save(): void,
+}
+
 export type Predicate = (value: any) => boolean
 
 export type TersiblePredicate = Tersible<Predicate>
 
-export type Expecter<T extends Struct = Struct> = Partial<ExpecterHash<T>> | Partial<ExpecterHash<T>>[]
-export type ExpecterNode<T extends Struct = Struct> = undefined | boolean | number | string | RegExp | Predicate | Partial<ExpecterHash<T>>
-export type ExpecterHash<T extends Struct = Struct> = {
-  [P in keyof T]: ExpecterNode<T[P]> | ExpecterNode<T[P]>[];
+export type Expectation<T extends Struct = Struct> = Partial<ExpectationHash<T>> | Partial<ExpectationHash<T>>[]
+export type ExpectationNode<T extends Struct = Struct> = undefined | boolean | number | string | RegExp | Predicate | Partial<ExpectationHash<T>>
+export type ExpectationHash<T extends Struct = Struct> = {
+  [P in keyof T]: ExpectationNode<T[P]> | ExpectationNode<T[P]>[];
 }
 
 export type Struct = StructNode | StructHash | (StructNode | StructHash)[]
@@ -18,6 +36,6 @@ export type StructHash = { [i: string]: Struct }
 
 export interface SatisfierExec {
   path: string[],
-  expected: boolean | number | string | RegExp | Predicate | ExpecterHash,
+  expected: boolean | number | string | RegExp | Predicate | ExpectationHash,
   actual: any
 }
diff --git a/src/spy.spec.ts b/src/spy.spec.ts
index 754a2e9..344b0a9 100644
--- a/src/spy.spec.ts
+++ b/src/spy.spec.ts
@@ -1,22 +1,16 @@
 import { test } from 'ava'
 
-import { spy, spyAsync } from './index'
+import { spy } from './index'
 
 function increment(x: number) { return ++x }
 
-test('spy on function returns a working function', t => {
-  const spyFoo = spy(increment)
-
-  t.is(spyFoo(1), 2)
-})
-
 test('record argument and result', t => {
-  const actual = spy(increment)
+  const { fn, calls } = spy(increment)
 
-  actual(1)
+  t.is(fn(1), 2)
 
-  t.is(actual.calls.length, 1)
-  const cr = actual.calls[0]
+  t.is(calls.length, 1)
+  const cr = calls[0]
   t.is(cr.arguments[0], 1)
   t.is(cr.result, 2)
 })
@@ -24,66 +18,75 @@ test('record argument and result', t => {
 function throws() { throw new Error('thrown') }
 
 test('capture error', t => {
-  const actual = spy(throws)
+  const { fn, calls } = spy(throws)
 
-  t.throws(() => actual())
+  const err = t.throws(fn)
 
-  t.is(actual.calls.length, 1)
-  const cr = actual.calls[0]
-  t.truthy(cr.error)
+  t.is(calls.length, 1)
+  t.is(calls[0].error, err)
 })
 
 // this is not a valid test as the package is used for boundary testing.
 // Boundary function are not expected to make changes to the arguments
 test.skip('argument should be immutable', t => {
   function mutate(x) { x.a++ }
-  const actual = spy(mutate)
-  actual({ a: 1 })
-  const cr = actual.calls[0]
+  const { fn, calls } = spy(mutate)
+  fn({ a: 1 })
+  const cr = calls[0]
   t.is(cr.arguments[0].a, 1)
 })
 
 function invoke(x, cb) { cb(x) }
 
 test('callback are spied', t => {
-  const actual = spy(invoke)
-  actual(1, x => t.is(x, 1))
-  const cr = actual.calls[0]
+  const { fn, calls } = spy(invoke)
+  fn(1, x => t.is(x, 1))
+  const cr = calls[0]
   t.is(cr.arguments[0], 1)
-  t.is(cr.arguments[1].calls[0].arguments[0], 1)
+  return cr.then(r => t.deepEqual(r, [1]))
+})
+
+function callbackOnLiterial(options) {
+  options.success(++options.data)
+}
+test('spec on jquery style callback', t => {
+  const { fn, calls } = spy(callbackOnLiterial)
+  fn({
+    data: 1,
+    success: (result) => {
+      t.is(result, 2)
+    }
+  })
+
+  const call = calls[0]
+  return call.then(response => t.is(response[0], 2))
 })
 
+
 const resolve = x => Promise.resolve(x)
 
 test('then() will receive result from promise', t => {
-  const spied = spyAsync(resolve)
+  const { fn, calls } = spy(resolve)
   // tslint:disable-next-line
-  spied(1)
-  return spied.calls[0].then(x => t.is(x, 1))
+  fn(1)
+  return calls[0].then(x => t.is(x, 1))
 })
 
 test('result from promise can be retrieved from await on the call', async t => {
-  const spied = spyAsync(resolve)
+  const { fn, calls } = spy(resolve)
   // tslint:disable-next-line
-  spied(1)
-  t.is(await spied.calls[0], 1)
+  fn(1)
+  t.is(await calls[0], 1)
 })
 
-const reject = x => Promise.reject(x)
+const reject = x => Promise.reject(new Error(x))
 
-test('throws() will receive error thrown by promise', t => {
-  const spied = spyAsync(reject)
+test('catch() will receive error thrown by promise', async t => {
+  const { fn, calls } = spy(reject)
   // tslint:disable-next-line
-  spied(1)
-  return spied.calls[0].throws(x => t.is(x, 1))
-})
-
-test('error result is received on catch block', async t => {
-  const spied = spyAsync(reject)
-  try {
-    await spied(1)
-  }
-  catch (x) {
-    t.is(x, 1)
-  }
+  return fn(1).catch(actualError => {
+    return calls[0].catch(err => {
+      t.is(err, actualError)
+    })
+  })
 })
diff --git a/src/spy.ts b/src/spy.ts
index 460278a..eaeed27 100644
--- a/src/spy.ts
+++ b/src/spy.ts
@@ -1,66 +1,83 @@
-export interface CallRecord {
-  arguments: any[],
-  result: any,
-  error: Error
+import { createCallRecordCreator } from './createCallRecordCreator'
+import { CallRecord } from './interfaces'
+
+export interface Spy<T> {
+  calls: ReadonlyArray<CallRecord>,
+  /**
+   * the spied function.
+   */
+  fn: T
 }
 
-export interface Spy {
-  calls: ReadonlyArray<CallRecord>
+function spyOnCallback(fn) {
+  let callback
+  return Object.assign(
+    (...args) => {
+      // callback is always assigned as it is used internally.
+      callback(...args)
+      fn(...args)
+    }, {
+      called(cb) {
+        callback = cb
+      }
+    })
 }
 
 /**
  * Spy on function that uses callback.
  */
-export function spy<T extends Function>(fn: T): T & Spy {
+export function spy<T extends Function>(fn: T): Spy<T> {
   const calls: CallRecord[] = []
-  const spiedFn: T = function (...args) {
-    const spiedArgs = args.map(a => {
-      return typeof a === 'function' ? spy(a) : a
+  const spied: T = function (...args) {
+    const creator = createCallRecordCreator(args)
+    calls.push(creator.callRecord)
+
+    const spiedCallbacks: any[] = []
+    const spiedArgs = args.map(arg => {
+      if (typeof arg === 'function') {
+        const spied = spyOnCallback(arg)
+        spiedCallbacks.push(spied)
+        return spied
+      }
+      if (typeof arg === 'object') {
+        Object.keys(arg).forEach(key => {
+          if (typeof arg[key] === 'function') {
+            const spied = spyOnCallback(arg[key])
+            spiedCallbacks.push(spied)
+            arg[key] = spied
+          }
+        })
+      }
+      return arg
     })
-    const call = { arguments: spiedArgs } as CallRecord
-    calls.push(call)
-    try {
-      const result = fn(...spiedArgs)
-      call.result = result
-      return result
+    if (spiedCallbacks.length > 0) {
+      new Promise(a => {
+        spiedCallbacks.forEach(s => {
+          s.called((...results) => {
+            a(results)
+          })
+        })
+      }).then(creator.resolve, creator.reject)
+
+      return fn(...spiedArgs)
     }
-    catch (err) {
-      call.error = err
-      throw err
+    else {
+      try {
+        const result = fn(...args)
+        if (result && typeof result.then === 'function')
+          result.then(creator.resolve, creator.reject)
+        creator.callRecord.result = result
+        return result
+      }
+      catch (error) {
+        creator.callRecord.error = error
+        throw error
+      }
     }
   } as any
 
-  return Object.assign(spiedFn, {
-    calls
-  })
-}
-
-
-export interface AsyncCallRecord extends Promise<any> {
-  arguments: any[],
-  throws(errback: any): Promise<any>
-}
-
-export interface AsyncSpy {
-  calls: ReadonlyArray<AsyncCallRecord>
-}
-
-/**
- * Spy on function that returns a promise.
- */
-export function spyAsync<T extends Function>(fn: T): T & AsyncSpy {
-  const calls: AsyncCallRecord[] = []
-  const spiedFn: T = function (...args) {
-    const call = { arguments: args } as AsyncCallRecord
-    calls.push(call)
-    const result = fn(...args)
-    call.then = (cb, eb) => result.then(cb, eb)
-    call.catch = cb => (result.catch(cb))
-    call.throws = call.catch
-    return result
-  } as any
-
-  return Object.assign(spiedFn, {
-    calls
-  })
+  return {
+    calls,
+    fn: spied
+  }
 }
diff --git a/wallaby.js b/wallaby.js
index da9d0fe..89736de 100644
--- a/wallaby.js
+++ b/wallaby.js
@@ -14,6 +14,10 @@ module.exports = function (wallaby) {
     compilers: {
       'src/**/*.ts': wallaby.compilers.typeScript({ module: 'commonjs' }),
     },
+    hints: {
+      allowIgnoringCoverageInTests: true,
+      ignoreCoverage: /istanbul ignore next/
+    },
     testFramework: 'ava'
   }
 }