diff --git a/.github/workflows/node.js.yml b/.github/workflows/node.js.yml
index 3a5060d6..61fc9dfa 100644
--- a/.github/workflows/node.js.yml
+++ b/.github/workflows/node.js.yml
@@ -12,6 +12,7 @@ on:
 jobs:
   build:
     runs-on: ${{ matrix.os }}
+    timeout-minutes: 5
     strategy:
       matrix:
         node-version: [12.x, 16.x, 18.x]
@@ -24,6 +25,7 @@ jobs:
       uses: actions/setup-node@v2
       with:
         node-version: ${{ matrix.node-version }}
+    - run: npm install -g npm@latest
     - run: npm install
     - run: npm run build --if-present
     - run: npm run test-ci
diff --git a/package.json b/package.json
index 201204e4..f82a4641 100644
--- a/package.json
+++ b/package.json
@@ -54,16 +54,11 @@
   "dependencies": {
     "resolvewithplus": "^0.8.4"
   },
-  "devDependencies": {
-    "run-script-os": "^1.1.6"
-  },
   "scripts": {
-    "mini:default": "npx esbuild ./src/*js --minify --allow-overwrite --outdir=src",
-    "mini:win32": "cd src && forfiles /m \"*.js\" /c \"cmd /c npx esbuild @file --minify --allow-overwrite --outfile=@file\"",
-    "mini": "run-script-os",
-    "test-ci": "npm run mini && npm run test",
-    "prepublishOnly": "npm run test-ci; npm pkg delete scripts devDependencies",
+    "test": "cd tests && npm run test:all",
     "lint": "npx eslint . --ext .js,.mjs",
-    "test": "cd tests && npm install && npm test"
+    "test-ci": "cd tests && npm run install:all && npm run test:all-ci",
+    "mini:pkg": "npm pkg delete scripts devDependencies",
+    "prepublishOnly": "npm run lint && npm run test-ci && npm run mini:pkg"
   }
 }
diff --git a/src/esmock.js b/src/esmock.js
index 2ee77735..68fe328d 100644
--- a/src/esmock.js
+++ b/src/esmock.js
@@ -9,7 +9,7 @@ import {
 } from './esmockCache.js';
 
 const esmock = async (modulePath, mockDefs, globalDefs, opt = {}, err) => {
-  const calleePath = (err || new Error()).stack.split('\n')[2]
+  const calleePath = (err || new Error).stack.split('\n')[2]
     .replace(/^.*file:\/\//, '') // rm every before filepath
     .replace(/:[\d]*:[\d]*.*$/, '') // rm line and row number
     .replace(/^.*:/, '') // rm windows-style drive location
@@ -30,10 +30,10 @@ const esmock = async (modulePath, mockDefs, globalDefs, opt = {}, err) => {
 };
 
 esmock.px = async (modulePath, mockDefs, globalDefs) => (
-  esmock(modulePath, mockDefs, globalDefs, { partial : true }, new Error()));
+  esmock(modulePath, mockDefs, globalDefs, { partial : true }, new Error));
 
 esmock.p = async (modulePath, mockDefs, globalDefs) => (
-  esmock(modulePath, mockDefs, globalDefs, { purge : false }, new Error()));
+  esmock(modulePath, mockDefs, globalDefs, { purge : false }, new Error));
 
 esmock.purge = mockModule => {
   if (mockModule && /object|function/.test(typeof mockModule)
diff --git a/tests/local/babelGeneratedDoubleDefault/babelGeneratedDoubleDefault.js b/tests/local/babelGeneratedDoubleDefault/babelGeneratedDoubleDefault.js
new file mode 100644
index 00000000..0be92c9e
--- /dev/null
+++ b/tests/local/babelGeneratedDoubleDefault/babelGeneratedDoubleDefault.js
@@ -0,0 +1,19 @@
+// this undesirable output was commonly generated by babel w browser-breaking
+// defineProperty and default.default definitions
+
+/* eslint-disable */
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports["default"] = void 0;
+
+function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
+
+var _default = function _default() {
+  return 'unmocked default.default';
+};
+
+exports["default"] = _default;
+/* eslint-enable */
diff --git a/tests/local/babelGeneratedDoubleDefault/package.json b/tests/local/babelGeneratedDoubleDefault/package.json
new file mode 100644
index 00000000..7da14565
--- /dev/null
+++ b/tests/local/babelGeneratedDoubleDefault/package.json
@@ -0,0 +1,4 @@
+{
+  "description": "problematic cjs file type generated by babel", 
+  "main": "./babelGeneratedDoubleDefault.js"
+}
diff --git a/tests/local/mainUtil.js b/tests/local/mainUtil.js
index 6cfc43bc..7631fe6e 100644
--- a/tests/local/mainUtil.js
+++ b/tests/local/mainUtil.js
@@ -1,4 +1,5 @@
 import formurlencoded from 'form-urlencoded';
+import babelGeneratedDoubleDefault from 'babelGeneratedDoubleDefault';
 import {
   mainUtilNamedExportOne,
   mainUtilNamedExportTwo
@@ -6,12 +7,15 @@ import {
 
 const mainUtil = () => 'mainUtil';
 
-const createString = () => formurlencoded.default({
+const createString = () => formurlencoded({
   mainUtil : 'a string',
   mainUtilNamedExportOneValue : mainUtilNamedExportOne(),
   mainUtilNamedExportTwoValue : mainUtilNamedExportTwo()
 });
 
+const callBabelGeneratedDoubleDefault = o => (
+  babelGeneratedDoubleDefault.default(o));
+
 const causeRuntimeError = () => mainUtil()();
 
 export default mainUtil;
@@ -19,5 +23,6 @@ export default mainUtil;
 export {
   mainUtil,
   createString,
-  causeRuntimeError
+  causeRuntimeError,
+  callBabelGeneratedDoubleDefault
 };
diff --git a/tests/package.json b/tests/package.json
index 2ff0f87a..32cc9cd0 100644
--- a/tests/package.json
+++ b/tests/package.json
@@ -1,5 +1,4 @@
 {
-  "name": "esmock-tests",
   "type": "module",
   "license": "ISC",
   "description": "various esmock unit tests",
@@ -7,27 +6,32 @@
     "type": "git",
     "url": "https://github.com/iambumblehead/esmock.git"
   },
+  "main": "package.json.esmock.export.js",
   "dependencies": {
-    "esmock": "file:..",
-    "ts-node": "^10.9.1",
-    "uvu": "0.5.3",
-    "ava": "^4.0.1",
     "eslint": "^8.12.0",
-    "ts-node": "^10.9.1",
-    "form-urlencoded": "4.2.1",
+    "sinon": "^12.0.1",
+    "form-urlencoded": "^6.0.7",
     "run-script-os": "^1.1.6",
-    "sinon": "^12.0.1"
+    "check-node-version": "^4.2.1",
+    "npm-run-all": "^4.1.5",
+    "babelGeneratedDoubleDefault": "file:./local/babelGeneratedDoubleDefault"
   },
   "scripts": {
-    "test-node-esbuildts": "node --loader=@esbuild-kit/esm-loader --loader=esmock --test ./tests-nodets/*ts",
-    "test-ava": "npx ava --node-arguments=\"--loader=esmock\" ./tests-ava/*.spec.js",
-    "test-uvu": "node --loader=esmock ./node_modules/uvu/bin.js ./tests-uvu/",
-    "test-node": "node --no-warnings --loader=esmock --test ./tests-node/",
-    "test-node-ts": "node --loader=ts-node/esm --loader=esmock --test ./tests-tsnode/*ts",
-    "test-node18": "npm run test-node && npm run test-node-ts",
-    "test-nodeis18": "if (node -v | grep v18); then npm run test-node18; fi;",
-    "test:default": "npm run test-nodeis18 && npm run test-ava && npm run test-uvu",
-    "test:windows": "npm run test-ava && npm run test-uvu",
-    "test": "npm install && run-script-os"
+    "mini:default": "cd .. && npx esbuild ./src/*js --minify --allow-overwrite --outdir=src",
+    "mini:win32": "cd .. && cd src && forfiles /m \"*.js\" /c \"cmd /c npx esbuild @file --minify --allow-overwrite --outfile=@file\"",
+    "mini": "run-script-os",
+    "isnode18": "check-node-version --node 18",
+    "install:esmock": "cd .. && npm install",
+    "install:test-ava": "cd tests-ava && npm install",
+    "install:test-uvu": "cd tests-uvu && npm install",
+    "install:test-node": "cd tests-node && npm install",
+    "install:test-nodets": "cd tests-nodets && npm install",
+    "install:all": "npm install && npm-run-all install:test*",
+    "test:test-ava": "cd tests-ava && npm test",
+    "test:test-uvu": "cd tests-uvu && npm test",
+    "test:test-node": "npm run isnode18 && cd tests-node && npm test || true",
+    "test:test-nodets": "npm run isnode18 && cd tests-nodets && npm test || true",
+    "test:all": "npm-run-all test:test*",
+    "test:all-ci": "npm run mini && npm run test:all"
   }
 }
diff --git a/tests/package.json.esmock.export.js b/tests/package.json.esmock.export.js
new file mode 100644
index 00000000..24f5b8e0
--- /dev/null
+++ b/tests/package.json.esmock.export.js
@@ -0,0 +1,35 @@
+export {default, load, resolve, getSource} from '../src/esmockLoader.js';
+
+// this file is used in tandem with two other things,
+//
+//   1. a "main" definition in ./package.json,
+//      ```
+//      {
+//        "main": "tests.esmock.export.js"
+//      }
+//      ```
+//
+//   2. an "esmock" definition in child ./tests-ava/package.json
+//      ```
+//      {
+//        "dependencies": {
+//          "esmock": "file:.."
+//        }
+//      }
+//      ```
+//
+// together, these allow child folder tests to,
+//  * import "esmock" rather than  "../../src/esmock.js"
+//  * use "--loader=esmock" rather than "../../src/esmockLoader.js"
+//
+// Previously, there existed only one test folder and package.json,
+// and during that time the package.json only needed to define
+// the esmock dependency as a local file eg "esmock": "file:.."
+//
+// When subdirectories were introduced, "esmock": "file:../.." did not
+// work with "--loader=esmock". The loader ignored the longer path and
+// threw an error message, creating need for this file.
+//
+//   Error [ERR_MODULE_NOT_FOUND]: Cannot find package \
+//     '/root/esmock/tests/tests-ava/node_modules/esmock/' \
+//     imported from /root/esmock/tests/tests-ava/
diff --git a/tests/tests-ava/package.json b/tests/tests-ava/package.json
new file mode 100644
index 00000000..33cd885e
--- /dev/null
+++ b/tests/tests-ava/package.json
@@ -0,0 +1,19 @@
+{
+  "type": "module",
+  "description": "esmock unit tests, ava",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/iambumblehead/esmock.git"
+  },
+  "dependencies": {
+    "ava": "^4.3.1",
+    "esmock": "file:..",
+    "sinon": "file:../node_modules/sinon",
+    "eslint": "file:../node_modules/eslint",
+    "form-urlencoded": "file:../node_modules/form-urlencoded",
+    "babelGeneratedDoubleDefault": "file:../local/babelGeneratedDoubleDefault"
+  },
+  "scripts": {
+    "test": "ava --node-arguments=\"--loader=esmock\""
+  }
+}
diff --git a/tests/tests-ava/esmock.ava.only.spec.js b/tests/tests-ava/spec/esmock.ava.only.spec.js
similarity index 63%
rename from tests/tests-ava/esmock.ava.only.spec.js
rename to tests/tests-ava/spec/esmock.ava.only.spec.js
index 8f599e85..e1b91149 100644
--- a/tests/tests-ava/esmock.ava.only.spec.js
+++ b/tests/tests-ava/spec/esmock.ava.only.spec.js
@@ -1,10 +1,12 @@
 import test from 'ava';
-import esmock from '../../src/esmock.js';
+// import esmock from '../../../src/esmock.js';
+import esmock from 'esmock';
 
 // this error can occur when sources do not define 'esmockloader'
 // on 'global' but use a process linked variable instead
 test.only('should not error when esmock used with ava.only', async t => {
-  await esmock('../local/mainUtil.js', {
+//  console.log( 'is?', global.esmockloader );
+  await esmock('../../local/mainUtil.js', {
     'form-urlencoded' : () => 'mock encode'
   });
 
diff --git a/tests/tests-ava/esmock.ava.spec.js b/tests/tests-ava/spec/esmock.ava.spec.js
similarity index 71%
rename from tests/tests-ava/esmock.ava.spec.js
rename to tests/tests-ava/spec/esmock.ava.spec.js
index 20c4318d..912a98d4 100644
--- a/tests/tests-ava/esmock.ava.spec.js
+++ b/tests/tests-ava/spec/esmock.ava.spec.js
@@ -1,9 +1,9 @@
 import test from 'ava';
-import esmock from '../../src/esmock.js';
+import esmock from 'esmock';
 import sinon from 'sinon';
 
 test('should return un-mocked file', async t => {
-  const main = await esmock('../local/main.js');
+  const main = await esmock('../../local/main.js');
   const mainqs = [
     'a+string',
     'mainUtilNamedExportOneValue=namedExportOne',
@@ -14,8 +14,8 @@ test('should return un-mocked file', async t => {
 });
 
 test('should mock a local file', async t => {
-  const main = await esmock.px('../local/main.js', {
-    '../local/mainUtil.js' : {
+  const main = await esmock.px('../../local/main.js', {
+    '../../local/mainUtil.js' : {
       createString : () => 'test string'
     }
   });
@@ -33,27 +33,35 @@ test.serial('should throw error if !esmockloader', async t => {
 });
 
 test('should throw error if local file not found', async t => {
-  await t.throwsAsync(() => esmock('../local/not/found.js', {
-    '../local/mainUtil.js' : {
+  const err = await t.throwsAsync(() => esmock('../../local/not/found.js', {
+    '../../local/mainUtil.js' : {
       createString : () => 'test string'
     }
   }), {
-    message : 'modulePath not found: "../local/not/found.js"'
+    instanceOf : Error,
+    name : 'Error'
   });
+
+  t.true(err.message.startsWith(
+    'modulePath not found: "../../local/not/found.js"'));
 });
 
 test('should throw error if local definition file not found', async t => {
-  await t.throwsAsync(() => esmock('../local/not/found.js', {
-    '../local/not/found.js' : {
+  const err = await t.throwsAsync(() => esmock('../../local/not/found.js', {
+    '../../local/not/found.js' : {
       createString : () => 'test string'
     }
   }), {
-    message : /not a valid path: \"..\/local\/not\/found.js\" \(used by/
+    instanceOf : Error,
+    name : 'Error'
   });
+
+  t.true(err.message.startsWith(
+    'not a valid path: "../../local/not/found.js"'));
 });
 
 test('should mock a module', async t => {
-  const main = await esmock('../local/mainUtil.js', {
+  const main = await esmock('../../local/mainUtil.js', {
     'form-urlencoded' : () => 'mock encode'
   });
 
@@ -62,8 +70,8 @@ test('should mock a module', async t => {
 });
 
 test('should mock a module, globally', async t => {
-  const main = await esmock('../local/main.js', {
-    '../local/mainUtilNamedExports.js' : {
+  const main = await esmock('../../local/main.js', {
+    '../../local/mainUtilNamedExports.js' : {
       mainUtilNamedExportOne : 'mocked'
     }
   }, {
@@ -85,8 +93,8 @@ test('should mock a module, globally', async t => {
 });
 
 test('should purge local and global mocks', async t => {
-  await esmock('../local/main.js', {
-    '../local/mainUtilNamedExports.js' : {
+  await esmock('../../local/main.js', {
+    '../../local/mainUtilNamedExports.js' : {
       mainUtilNamedExportOne : 'mocked'
     }
   }, {
@@ -110,13 +118,13 @@ test('should purge local and global mocks', async t => {
 });
 
 test('should mock a module, many times differently', async t => {
-  const mainfoo = await esmock('../local/mainUtil.js', {
+  const mainfoo = await esmock('../../local/mainUtil.js', {
     'form-urlencoded' : () => 'mock encode foo'
   });
-  const mainbar = await esmock('../local/mainUtil.js', {
+  const mainbar = await esmock('../../local/mainUtil.js', {
     'form-urlencoded' : () => 'mock encode bar'
   });
-  const mainbaz = await esmock('../local/mainUtil.js', {
+  const mainbaz = await esmock('../../local/mainUtil.js', {
     'form-urlencoded' : () => 'mock encode baz'
   });
   t.is(typeof mainfoo, 'function');
@@ -126,7 +134,7 @@ test('should mock a module, many times differently', async t => {
 });
 
 test('should return un-mocked file (again)', async t => {
-  const main = await esmock('../local/main.js');
+  const main = await esmock('../../local/main.js');
   const mainqs = [
     'a+string',
     'mainUtilNamedExportOneValue=namedExportOne',
@@ -137,8 +145,8 @@ test('should return un-mocked file (again)', async t => {
 });
 
 test('should mock local file', async t => {
-  const mainUtil = await esmock.px('../local/mainUtil.js', {
-    '../local/mainUtilNamedExports.js' : {
+  const mainUtil = await esmock.px('../../local/mainUtil.js', {
+    '../../local/mainUtilNamedExports.js' : {
       mainUtilNamedExportOne : () => 'foobar'
     }
   });
@@ -153,9 +161,9 @@ test('should mock local file', async t => {
 });
 
 test('should mock module and local file at the same time', async t => {
-  const mainUtil = await esmock.px('../local/mainUtil.js', {
+  const mainUtil = await esmock.px('../../local/mainUtil.js', {
     'form-urlencoded' : o => JSON.stringify(o),
-    '../local/mainUtilNamedExports.js' : {
+    '../../local/mainUtilNamedExports.js' : {
       mainUtilNamedExportOne : () => 'foobar'
     }
   });
@@ -168,24 +176,20 @@ test('should mock module and local file at the same time', async t => {
 });
 
 test('__esModule definition, inconsequential', async t => {
-  const mainUtil = await esmock.px('../local/mainUtil.js', {
-    'form-urlencoded' : o => JSON.stringify(o),
-    '../local/mainUtilNamedExports.js' : {
+  const mainUtil = await esmock.px('../../local/mainUtil.js', {
+    'babelGeneratedDoubleDefault' : o => o,
+    '../../local/mainUtilNamedExports.js' : {
       mainUtilNamedExportOne : () => 'foobar',
       __esModule : true
     }
   });
 
-  t.is(mainUtil.createString(), JSON.stringify({
-    mainUtil : 'a string',
-    mainUtilNamedExportOneValue : 'foobar',
-    mainUtilNamedExportTwoValue : 'namedExportTwo'
-  }));
+  t.is(mainUtil.callBabelGeneratedDoubleDefault('mocked'), 'mocked');
 });
 
 test('should work well with sinon', async t => {
-  const mainUtil = await esmock.px('../local/mainUtil.js', {
-    '../local/mainUtilNamedExports.js' : {
+  const mainUtil = await esmock.px('../../local/mainUtil.js', {
+    '../../local/mainUtilNamedExports.js' : {
       mainUtilNamedExportOne : sinon.stub().returns('foobar')
     }
   });
@@ -198,24 +202,24 @@ test('should work well with sinon', async t => {
 });
 
 test('should mock an mjs file', async t => {
-  const main = await esmock('../local/usesmjsModule.js', {
-    '../local/exampleMJS.mjs' : () => 'first mocked'
+  const main = await esmock('../../local/usesmjsModule.js', {
+    '../../local/exampleMJS.mjs' : () => 'first mocked'
   });
 
   t.is(main.verifyImportedMock(), 'first mocked');
 });
 
 test('should mock an mjs file, again', async t => {
-  const main = await esmock('../local/usesmjsModule.js', {
-    '../local/exampleMJS.mjs' : () => 'second mocked'
+  const main = await esmock('../../local/usesmjsModule.js', {
+    '../../local/exampleMJS.mjs' : () => 'second mocked'
   });
 
   t.is(main.verifyImportedMock(), 'second mocked');
 });
 
 test('should mock an exported constant values', async t => {
-  const main = await esmock('../local/usesmjsModule.js', {
-    '../local/env.js' : {
+  const main = await esmock('../../local/usesmjsModule.js', {
+    '../../local/env.js' : {
       TESTCONSTANT : 'hello world'
     }
   });
@@ -224,7 +228,7 @@ test('should mock an exported constant values', async t => {
 });
 
 test('should mock core module', async t => {
-  const usesCoreModule = await esmock('../local/usesCoreModule.js', {
+  const usesCoreModule = await esmock('../../local/usesCoreModule.js', {
     fs : {
       existsSync : () => true,
       readFileSync : filepath => filepath === 'checkfilepath.js'
@@ -237,8 +241,8 @@ test('should mock core module', async t => {
 });
 
 test('should apply third parameter "global" definitions', async t => {
-  const main = await esmock.px('../local/main.js', {
-    '../local/mainUtil.js' : {
+  const main = await esmock.px('../../local/main.js', {
+    '../../local/mainUtil.js' : {
       exportedFunction : () => 'foobar'
     }
   }, {
@@ -254,7 +258,7 @@ test('should apply third parameter "global" definitions', async t => {
 });
 
 test('returns spread-imported [object Module] default export', async t => {
-  const main = await esmock('../local/usesObjectModule.js', {
+  const main = await esmock('../../local/usesObjectModule.js', {
     fs : {
       exportedFunction : () => 'foobar'
     }
@@ -264,7 +268,7 @@ test('returns spread-imported [object Module] default export', async t => {
 });
 
 test('mocks inline `async import("name")`', async t => {
-  const writeJSConfigFile = await esmock.p('../local/usesInlineImport.mjs', {
+  const writeJSConfigFile = await esmock.p('../../local/usesInlineImport.mjs', {
     eslint : {
       ESLint : function (...o) {
         this.stringify = () => JSON.stringify(...o);
@@ -295,7 +299,7 @@ test('mocks inline `async import("name")`', async t => {
 });
 
 test('should have small querystring in stacktrace filename', async t => {
-  const { causeRuntimeError } = await esmock('../local/mainUtil.js');
+  const { causeRuntimeError } = await esmock('../../local/mainUtil.js');
 
   try {
     causeRuntimeError();
@@ -309,8 +313,8 @@ test('should have small querystring in stacktrace filename', async t => {
 test('should have small querystring in stacktrace filename, deep', async t => {
   const {
     causeRuntimeErrorFromImportedFile
-  } = await esmock.px('../local/main.js', {}, {
-    '../local/mainUtil.js' : {
+  } = await esmock.px('../../local/main.js', {}, {
+    '../../local/mainUtil.js' : {
       causeRuntimeError : () => {
         t.nonexistantmethod();
       }
@@ -330,8 +334,8 @@ test('should have small querystring in stacktrace filename, deep', async t => {
 
 test('should have small querystring in stacktrace filename, deep2', async t => {
   const causeDeepErrorParent =
-    await esmock.px('../local/causeDeepErrorParent.js', {}, {
-      '../local/causeDeepErrorGrandChild.js' : {
+    await esmock.px('../../local/causeDeepErrorParent.js', {}, {
+      '../../local/causeDeepErrorGrandChild.js' : {
         what : 'now'
       }
     });
@@ -352,23 +356,23 @@ test('should have small querystring in stacktrace filename, deep2', async t => {
 });
 
 test('should merge "default" value, when safe', async t => {
-  const main = await esmock('../local/main.js');
+  const main = await esmock('../../local/main.js');
 
   t.is(main(), main.default());
 
-  const mockMainA = await esmock('../local/exportsMain.js', {
-    '../local/main.js' : () => 'mocked main'
+  const mockMainA = await esmock('../../local/exportsMain.js', {
+    '../../local/main.js' : () => 'mocked main'
   });
-  const mockMainB = await esmock('../local/exportsMain.js', {
-    '../local/main.js' : { default : () => 'mocked main' }
+  const mockMainB = await esmock('../../local/exportsMain.js', {
+    '../../local/main.js' : { default : () => 'mocked main' }
   });
 
   t.is(mockMainA(), mockMainB());
 });
 
 test('should not error when mocked file has space in path', async t => {
-  const main = await esmock('../local/main.js', {
-    '../local/space in path/wild-file.js' : {
+  const main = await esmock('../../local/main.js', {
+    '../../local/space in path/wild-file.js' : {
       default : 'tamed'
     }
   });
diff --git a/tests/tests-node/package.json b/tests/tests-node/package.json
new file mode 100644
index 00000000..0abfe517
--- /dev/null
+++ b/tests/tests-node/package.json
@@ -0,0 +1,18 @@
+{
+  "type": "module",
+  "description": "esmock unit tests, node native runner",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/iambumblehead/esmock.git"
+  },
+  "dependencies": {
+    "esmock": "file:..",
+    "sinon": "file:../node_modules/sinon",
+    "eslint": "file:../node_modules/eslint",
+    "form-urlencoded": "file:../node_modules/form-urlencoded",
+    "babelGeneratedDoubleDefault": "file:../local/babelGeneratedDoubleDefault"
+  },
+  "scripts": {
+    "test": "node --loader=esmock --test"
+  }
+}
diff --git a/tests/tests-tsnode/esmock.node-ts.test.ts b/tests/tests-nodets/esmock.node-ts.test.ts
similarity index 88%
rename from tests/tests-tsnode/esmock.node-ts.test.ts
rename to tests/tests-nodets/esmock.node-ts.test.ts
index 8adb1ff4..4c938782 100644
--- a/tests/tests-tsnode/esmock.node-ts.test.ts
+++ b/tests/tests-nodets/esmock.node-ts.test.ts
@@ -1,6 +1,6 @@
 import test from 'node:test';
 import assert from 'assert';
-import esmock from '../../src/esmock.js';
+import esmock from 'esmock';
 
 test('should mock ts when using node-ts', { only : true }, async () => {
   const main = await esmock('../local/main.ts', {
diff --git a/tests/tests-nodets/package.json b/tests/tests-nodets/package.json
new file mode 100644
index 00000000..948e3b04
--- /dev/null
+++ b/tests/tests-nodets/package.json
@@ -0,0 +1,19 @@
+{
+  "type": "module",
+  "description": "esmock unit tests, ts-node/esm with node native runner",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/iambumblehead/esmock.git"
+  },
+  "dependencies": {
+    "ts-node": "^10.9.1",
+    "esmock": "file:..",
+    "sinon": "file:../node_modules/sinon",
+    "eslint": "file:../node_modules/eslint",
+    "form-urlencoded": "file:../node_modules/form-urlencoded",
+    "babelGeneratedDoubleDefault": "file:../local/babelGeneratedDoubleDefault"
+  },
+  "scripts": {
+    "test": "node --loader=ts-node/esm --loader=esmock --test *test.ts"
+  }
+}
diff --git a/tests/tsconfig.json b/tests/tests-nodets/tsconfig.json
similarity index 100%
rename from tests/tsconfig.json
rename to tests/tests-nodets/tsconfig.json
diff --git a/tests/tests-uvu/esmock.uvu.spec.js b/tests/tests-uvu/esmock.uvu.spec.js
index d48c34dd..77e3c8e1 100644
--- a/tests/tests-uvu/esmock.uvu.spec.js
+++ b/tests/tests-uvu/esmock.uvu.spec.js
@@ -1,8 +1,7 @@
 import { test } from 'uvu';
 import * as assert from 'uvu/assert';
 import sinon from 'sinon';
-
-import esmock from '../../src/esmock.js';
+import esmock from 'esmock';
 
 test('should return un-mocked file', async () => {
   const main = await esmock('../local/main.js');
@@ -179,18 +178,14 @@ test('should mock module and local file at the same time', async () => {
 
 test('__esModule definition, inconsequential', async () => {
   const mainUtil = await esmock.px('../local/mainUtil.js', {
-    'form-urlencoded' : o => JSON.stringify(o),
+    'babelGeneratedDoubleDefault' : o => o,
     '../local/mainUtilNamedExports.js' : {
       mainUtilNamedExportOne : () => 'foobar',
       __esModule : true
     }
   });
 
-  assert.is(mainUtil.createString(), JSON.stringify({
-    mainUtil : 'a string',
-    mainUtilNamedExportOneValue : 'foobar',
-    mainUtilNamedExportTwoValue : 'namedExportTwo'
-  }));
+  assert.is(mainUtil.callBabelGeneratedDoubleDefault('mocked'), 'mocked');
 });
 
 test('should work well with sinon', async () => {
diff --git a/tests/tests-uvu/package.json b/tests/tests-uvu/package.json
new file mode 100644
index 00000000..025fdc77
--- /dev/null
+++ b/tests/tests-uvu/package.json
@@ -0,0 +1,19 @@
+{
+  "type": "module",
+  "description": "esmock unit tests, uvu",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/iambumblehead/esmock.git"
+  },
+  "dependencies": {
+    "uvu": "^0.5.6",
+    "esmock": "file:..",
+    "sinon": "file:../node_modules/sinon",
+    "eslint": "file:../node_modules/eslint",
+    "form-urlencoded": "file:../node_modules/form-urlencoded",
+    "babelGeneratedDoubleDefault": "file:../local/babelGeneratedDoubleDefault"
+  },
+  "scripts": {
+    "test": "node --loader=esmock ./node_modules/uvu/bin.js"
+  }
+}