build(testlab): move test files to src/__tests__

This change greatly simplifies our build and project setup.

- Source files are compiled from `src/{foo}` to `dist/{foo}`, the same
  pattern is applied to test files too.

- Both TypeScript sources and JavaScript output are stored in the same
  path relative to project root. This makes it much easier to refer
  to test fixtures.

This change is also enabling future improvements, for example TypeScript
project references and migration to jest test runner.

.nycrc

@@ -6,6 +6,7 @@
     ],
     "exclude": [
       "packages/*/dist/test/",
+      "packages/*/dist/__tests__/",
       "packages/cli/test/",
       "examples/*/dist/test/",
       "**/.sandbox/"

package.json

@@ -50,7 +50,7 @@
     "test:ci": "node packages/build/bin/run-nyc npm run mocha --scripts-prepend-node-path",
     "verify:docs": "npm run build:site -- --verify",
     "build:site": "./bin/build-docs-site.sh",
-    "mocha": "node packages/build/bin/run-mocha \"packages/*/dist/test/**/*.js\" \"examples/*/dist/test/**/*.js\" \"packages/cli/test/**/*.js\" \"packages/build/test/*/*.js\"",
+    "mocha": "node packages/build/bin/run-mocha \"packages/*/dist/test/**/*.js\" \"packages/*/dist/__tests__/**/*.js\" \"examples/*/dist/test/**/*.js\" \"packages/cli/test/**/*.js\" \"packages/build/test/*/*.js\"",
     "posttest": "npm run lint"
   },
   "config": {

packages/testlab/package.json

@@ -10,7 +10,7 @@
     "build:apidocs": "lb-apidocs",
     "clean": "lb-clean loopback-testlab*.tgz dist package api-docs",
     "pretest": "npm run build",
-    "test": "lb-mocha \"dist/test\"",
+    "test": "lb-mocha \"dist/__tests__\"",
     "verify": "npm pack && tar xf loopback-testlab*.tgz && tree package && npm run clean"
   },
   "author": "IBM",
@@ -39,10 +39,10 @@
     "README.md",
     "index.js",
     "index.d.ts",
-    "dist/src",
-    "dist/index*",
+    "dist",
     "should-as-function.d.ts",
-    "src"
+    "src",
+    "!*/__tests__"
   ],
   "repository": {
     "type": "git",

packages/testlab/test/unit/to-json.test.ts → packages/testlab/src/__tests__/unit/to-json.test.ts

@@ -3,8 +3,8 @@
 // This file is licensed under the MIT License.
 // License text available at https://opensource.org/licenses/MIT
 
-import {expect} from '../../src/expect';
-import {toJSON} from '../../src/to-json';
+import {expect} from '../../expect';
+import {toJSON} from '../../to-json';
 
 describe('toJSON', () => {
   it('removes properties set to undefined', () => {

packages/testlab/tsconfig.build.json

@@ -2,7 +2,7 @@
   "$schema": "http://json.schemastore.org/tsconfig",
   "extends": "@loopback/build/config/tsconfig.common.json",
   "compilerOptions": {
-    "rootDir": "."
+    "rootDir": "src"
   },
-  "include": ["index.ts", "src", "test"]
+  "include": ["src"]
 }