diff --git a/.vscode/tasks.json b/.vscode/tasks.json
new file mode 100644
index 0000000..4a0c45d
--- /dev/null
+++ b/.vscode/tasks.json
@@ -0,0 +1,14 @@
+{
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+}
diff --git a/resolver/package-lock.json b/resolver/package-lock.json
new file mode 100644
index 0000000..1a38f72
--- /dev/null
+++ b/resolver/package-lock.json
@@ -0,0 +1,1051 @@
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+          "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
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+            "ansi-regex": "^2.0.0"
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+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+      "dev": true
+    },
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+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
+      "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
+      "dev": true
+    },
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+      "version": "13.2.2",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.2.2.tgz",
+      "integrity": "sha512-WyEoxgyTD3w5XRpAQNYUB9ycVH/PQrToaTXdYXRdOXvEy1l19br+VJsc0vcO8PTGg5ro/l/GY7F/JMEBmI0BxA==",
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+      "requires": {
+        "cliui": "^4.0.0",
+        "find-up": "^3.0.0",
+        "get-caller-file": "^2.0.1",
+        "os-locale": "^3.1.0",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^2.0.0",
+        "set-blocking": "^2.0.0",
+        "string-width": "^3.0.0",
+        "which-module": "^2.0.0",
+        "y18n": "^4.0.0",
+        "yargs-parser": "^13.0.0"
+      },
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+        "ansi-regex": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
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+        },
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+          "dev": true,
+          "requires": {
+            "emoji-regex": "^7.0.1",
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^5.1.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^4.1.0"
+          }
+        }
+      }
+    },
+    "yargs-parser": {
+      "version": "13.0.0",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.0.0.tgz",
+      "integrity": "sha512-w2LXjoL8oRdRQN+hOyppuXs+V/fVAYtpcrRxZuF7Kt/Oc+Jr2uAcVntaUTNT6w5ihoWfFDpNY8CPx1QskxZ/pw==",
+      "dev": true,
+      "requires": {
+        "camelcase": "^5.0.0",
+        "decamelize": "^1.2.0"
+      }
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+    "yargs-unparser": {
+      "version": "1.5.0",
+      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.5.0.tgz",
+      "integrity": "sha512-HK25qidFTCVuj/D1VfNiEndpLIeJN78aqgR23nL3y4N0U/91cOAzqfHlF8n2BvoNDcZmJKin3ddNSvOxSr8flw==",
+      "dev": true,
+      "requires": {
+        "flat": "^4.1.0",
+        "lodash": "^4.17.11",
+        "yargs": "^12.0.5"
+      },
+      "dependencies": {
+        "get-caller-file": {
+          "version": "1.0.3",
+          "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-1.0.3.tgz",
+          "integrity": "sha512-3t6rVToeoZfYSGd8YoLFR2DJkiQrIiUrGcjvFX2mDw3bn6k2OtwHN0TNCLbBO+w8qTvimhDkv+LSscbJY1vE6w==",
+          "dev": true
+        },
+        "require-main-filename": {
+          "version": "1.0.1",
+          "resolved": "https://registry.npmjs.org/require-main-filename/-/require-main-filename-1.0.1.tgz",
+          "integrity": "sha1-l/cXtp1IeE9fUmpsWqj/3aBVpNE=",
+          "dev": true
+        },
+        "yargs": {
+          "version": "12.0.5",
+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-12.0.5.tgz",
+          "integrity": "sha512-Lhz8TLaYnxq/2ObqHDql8dX8CJi97oHxrjUcYtzKbbykPtVW9WB+poxI+NM2UIzsMgNCZTIf0AQwsjK5yMAqZw==",
+          "dev": true,
+          "requires": {
+            "cliui": "^4.0.0",
+            "decamelize": "^1.2.0",
+            "find-up": "^3.0.0",
+            "get-caller-file": "^1.0.1",
+            "os-locale": "^3.0.0",
+            "require-directory": "^2.1.1",
+            "require-main-filename": "^1.0.1",
+            "set-blocking": "^2.0.0",
+            "string-width": "^2.0.0",
+            "which-module": "^2.0.0",
+            "y18n": "^3.2.1 || ^4.0.0",
+            "yargs-parser": "^11.1.1"
+          }
+        },
+        "yargs-parser": {
+          "version": "11.1.1",
+          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-11.1.1.tgz",
+          "integrity": "sha512-C6kB/WJDiaxONLJQnF8ccx9SEeoTTLek8RVbaOIsrAUS8VrBEXfmeSnCZxygc+XC2sNMBIwOOnfcxiynjHsVSQ==",
+          "dev": true,
+          "requires": {
+            "camelcase": "^5.0.0",
+            "decamelize": "^1.2.0"
+          }
+        }
+      }
+    },
+    "yn": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.0.tgz",
+      "integrity": "sha512-kKfnnYkbTfrAdd0xICNFw7Atm8nKpLcLv9AZGEt+kczL/WQVai4e2V6ZN8U/O+iI6WrNuJjNNOyu4zfhl9D3Hg==",
+      "dev": true
+    }
+  }
+}
diff --git a/resolver/package.json b/resolver/package.json
new file mode 100644
index 0000000..0002ba2
--- /dev/null
+++ b/resolver/package.json
@@ -0,0 +1,19 @@
+{
+  "name": "fluent-reference-resolver",
+  "private": true,
+  "version": "0.0.1",
+  "description": "A reference resolver for Fluent AST",
+  "scripts": {
+    "watch": "tsc --watch",
+    "test": "mocha -u tdd -r ts-node/register test/**/*_test.ts"
+  },
+  "author": "Mozilla <l10n-drivers@mozilla.org>",
+  "license": "Apache-2.0",
+  "devDependencies": {
+    "@types/mocha": "^5.2.7",
+    "@types/node": "^12.0.4",
+    "mocha": "^6.1.4",
+    "ts-node": "^8.2.0",
+    "typescript": "^3.5.1"
+  }
+}
diff --git a/resolver/src/bundle.ts b/resolver/src/bundle.ts
index 67ddccc..d8cea87 100644
--- a/resolver/src/bundle.ts
+++ b/resolver/src/bundle.ts
@@ -2,7 +2,6 @@ import * as ast from "./ast";
 import {Scope} from "./scope";
 import {Value, NoneValue} from "./value";
 import {Message} from "./message";
-import {hello, exclamation, select} from "./fixtures";
 import {ScopeError} from "./error";
 
 export interface Formatted {
@@ -11,13 +10,13 @@ export interface Formatted {
 }
 
 export class Bundle {
-    messages = new Map(
-        Object.entries({
-            hello: new Message(hello as ast.Message),
-            exclamation: new Message(exclamation as ast.Message),
-            select: new Message(select as ast.Message),
-        })
-    );
+    public readonly messages: Map<string, Message> = new Map();
+
+    addResource(resource: Map<string, Message>) {
+        for (let [id, message] of resource) {
+            this.messages.set(id, message);
+        }
+    }
 
     getMessage(id: string) {
         return this.messages.get(id);
@@ -29,9 +28,10 @@ export class Bundle {
 
     formatValue(message: Message, variables: Map<string, Value>): Formatted {
         let scope = this.createScope(variables);
-        let result = message.resolveValue(scope);
-        console.log(result);
-        let value = result.unwrapOrElse(() => new NoneValue()).format(scope);
+        let value = message
+            .resolveValue(scope)
+            .unwrapOrElse(() => new NoneValue())
+            .format(scope);
         return {value, errors: scope.errors};
     }
 }
diff --git a/resolver/src/index.ts b/resolver/src/index.ts
index 08f3d65..01fad38 100644
--- a/resolver/src/index.ts
+++ b/resolver/src/index.ts
@@ -1,18 +1,4 @@
-import {Bundle} from "./bundle";
-import {StringValue} from "./value";
+import * as _ast from "./ast";
+export let ast = _ast;
 
-let variables = new Map(
-    Object.entries({
-        worl: new StringValue("World"),
-        selector: new StringValue("b"),
-    })
-);
-
-let bundle = new Bundle();
-
-let message = bundle.getMessage("select");
-if (message !== undefined) {
-    let {value, errors} = bundle.formatValue(message, variables);
-    console.log(value);
-    console.log(errors);
-}
+export {Bundle} from "./bundle";
diff --git a/resolver/src/scope.ts b/resolver/src/scope.ts
index ef525ed..78824a7 100644
--- a/resolver/src/scope.ts
+++ b/resolver/src/scope.ts
@@ -33,8 +33,9 @@ export class Scope {
         if (value !== undefined) {
             return new Success(value);
         } else {
-            this.errors.push(new ScopeError(ErrorKind.UnknownVariable, node.id.name));
-            return new Failure(new StringValue(`$${node.id.name}`));
+            let name = `$${node.id.name}`;
+            this.errors.push(new ScopeError(ErrorKind.UnknownVariable, name));
+            return new Failure(new StringValue(name));
         }
     }
 
diff --git a/resolver/src/fixtures.ts b/resolver/test/fixtures.ts
similarity index 97%
rename from resolver/src/fixtures.ts
rename to resolver/test/fixtures.ts
index 56be5da..775936d 100644
--- a/resolver/src/fixtures.ts
+++ b/resolver/test/fixtures.ts
@@ -1,3 +1,4 @@
+// hello = Hello, {$world}
 export let hello = {
     type: "Message",
     id: {
@@ -25,6 +26,7 @@ export let hello = {
     },
 };
 
+// exclamation = {hello}!
 export let exclamation = {
     type: "Message",
     id: {
@@ -53,6 +55,10 @@ export let exclamation = {
     },
 };
 
+// select = {$selector ->
+//    *[a] (a) {hello}
+//     [b] (b) {exclamation}
+// }
 export let select = {
     type: "Message",
     id: {
diff --git a/resolver/test/sample_test.ts b/resolver/test/sample_test.ts
new file mode 100644
index 0000000..12aedcb
--- /dev/null
+++ b/resolver/test/sample_test.ts
@@ -0,0 +1,170 @@
+import * as assert from "assert";
+import {hello, exclamation, select} from "./fixtures";
+import * as ast from "../src/ast";
+import {Message} from "../src/message";
+import {Bundle} from "../src/bundle";
+import {StringValue} from "../src/value";
+import {ScopeError, ErrorKind} from "../src/error";
+
+let resource = new Map(
+    Object.entries({
+        hello: new Message(hello as ast.Message),
+        exclamation: new Message(exclamation as ast.Message),
+        select: new Message(select as ast.Message),
+    })
+);
+
+suite("Sample suite", function() {
+    suiteSetup(function() {
+        this.bundle = new Bundle();
+        this.bundle.addResource(resource);
+    });
+
+    test("hello with a variable", function() {
+        let message = this.bundle.getMessage("hello");
+        if (message) {
+            let {value, errors} = this.bundle.formatValue(
+                message,
+                new Map(
+                    Object.entries({
+                        world: new StringValue("World"),
+                    })
+                )
+            );
+            assert.equal(value, "Hello, World");
+            assert.equal(errors.length, 0);
+        }
+    });
+
+    test("hello without a variable", function() {
+        let message = this.bundle.getMessage("hello");
+        if (message) {
+            let {value, errors} = this.bundle.formatValue(message, new Map());
+            assert.equal(value, "Hello, {$world}");
+            assert.equal(errors.length, 1);
+            assert.deepEqual(errors[0], new ScopeError(ErrorKind.UnknownVariable, "$world"));
+        }
+    });
+
+    test("exclamation with a variable", function() {
+        let message = this.bundle.getMessage("exclamation");
+        if (message) {
+            let {value, errors} = this.bundle.formatValue(
+                message,
+                new Map(
+                    Object.entries({
+                        world: new StringValue("World"),
+                    })
+                )
+            );
+            assert.equal(value, "Hello, World!");
+            assert.equal(errors.length, 0);
+        }
+    });
+
+    test("exclamation without a variable", function() {
+        let message = this.bundle.getMessage("exclamation");
+        if (message) {
+            let {value, errors} = this.bundle.formatValue(message, new Map());
+            assert.equal(value, "Hello, {$world}!");
+            assert.equal(errors.length, 1);
+            assert.deepEqual(errors[0], new ScopeError(ErrorKind.UnknownVariable, "$world"));
+        }
+    });
+
+    test("select [a] with a variable", function() {
+        let message = this.bundle.getMessage("select");
+        if (message) {
+            let {value, errors} = this.bundle.formatValue(
+                message,
+                new Map(
+                    Object.entries({
+                        world: new StringValue("World"),
+                        selector: new StringValue("a"),
+                    })
+                )
+            );
+            assert.equal(value, "(a) Hello, World");
+            assert.equal(errors.length, 0);
+        }
+    });
+
+    test("select [a] without a variable", function() {
+        let message = this.bundle.getMessage("select");
+        if (message) {
+            let {value, errors} = this.bundle.formatValue(
+                message,
+                new Map(
+                    Object.entries({
+                        selector: new StringValue("a"),
+                    })
+                )
+            );
+            assert.equal(value, "(a) Hello, {$world}");
+            assert.equal(errors.length, 1);
+            assert.deepEqual(errors[0], new ScopeError(ErrorKind.UnknownVariable, "$world"));
+        }
+    });
+
+    test("select [b] with a variable", function() {
+        let message = this.bundle.getMessage("select");
+        if (message) {
+            let {value, errors} = this.bundle.formatValue(
+                message,
+                new Map(
+                    Object.entries({
+                        world: new StringValue("World"),
+                        selector: new StringValue("b"),
+                    })
+                )
+            );
+            assert.equal(value, "(b) Hello, World!");
+            assert.equal(errors.length, 0);
+        }
+    });
+
+    test("select [b] without a variable", function() {
+        let message = this.bundle.getMessage("select");
+        if (message) {
+            let {value, errors} = this.bundle.formatValue(
+                message,
+                new Map(
+                    Object.entries({
+                        selector: new StringValue("b"),
+                    })
+                )
+            );
+            assert.equal(value, "(b) Hello, {$world}!");
+            assert.equal(errors.length, 1);
+            assert.deepEqual(errors[0], new ScopeError(ErrorKind.UnknownVariable, "$world"));
+        }
+    });
+
+    test("select default with a variable", function() {
+        let message = this.bundle.getMessage("select");
+        if (message) {
+            let {value, errors} = this.bundle.formatValue(
+                message,
+                new Map(
+                    Object.entries({
+                        world: new StringValue("World"),
+                    })
+                )
+            );
+            assert.equal(value, "(a) Hello, World");
+            assert.equal(errors.length, 1);
+            assert.deepEqual(errors[0], new ScopeError(ErrorKind.UnknownVariable, "$selector"));
+        }
+    });
+
+    test("select default without a variable", function() {
+        let message = this.bundle.getMessage("select");
+        if (message) {
+            let {value, errors} = this.bundle.formatValue(message, new Map());
+            assert.equal(value, "(a) Hello, {$world}");
+            assert.equal(errors.length, 2);
+            assert.deepEqual(errors[0], new ScopeError(ErrorKind.UnknownVariable, "$selector"));
+            assert.deepEqual(errors[1], new ScopeError(ErrorKind.UnknownVariable, "$world"));
+        }
+    });
+});