Tools: Try adding infrastructure for PHPUnit tests (#299)

* Add PHPUnit bootstrapping

* Install deps correctly.

* Fix composer deps

* Setup wp-env too

* Update to gutenberg bootstrap

* Add phpunit deps

* Set the WP_RUN_CORE_TESTS constant so that we can test the wp_environment_type

* Force phpunits config file not to be forced to local environment, to allow testing.

* Attempt to work around phpunit-wp-config.php permissions

* Revert "Attempt to work around phpunit-wp-config.php permissions"

This reverts commit 9897577.

* Attempt to workaround wp-env permissions and limitations.

* Simplify the phpunit bootstrapping

* Move @wordpress/env to a devDep

* Update WP version for unit test install

* Use the files from wp-env if available

* Set a null `WP_ENVIRONMENT_TYPE` for the test environment

* Update workflow to use yarn, cache yarn deps, remove `WP_ENVIRONMENT_TYPE` workaround

* Update test test to passing tests only

* Update testing branch name

* Fix workflow file indentation

Co-authored-by: Dion Hulse <[email protected]>
Co-authored-by: Dion Hulse <[email protected]>
Co-authored-by: Dion Hulse <[email protected]>

.github/workflows/tests.yml

@@ -0,0 +1,38 @@
+name: CI
+
+on:
+  push:
+    branches: [ trunk, try/phpunit-tests ]
+  pull_request:
+    branches: [ trunk ]
+
+  workflow_dispatch:
+
+jobs:
+  run-tests:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@2541b1294d2704b0964813337f33b291d3f8596b # v3.0.2
+
+      - name: Install NodeJS
+        uses: actions/setup-node@eeb10cff27034e7acf239c5d29f62154018672fd # v3.3.0
+        with:
+            node-version-file: '.nvmrc'
+            cache: yarn
+
+      - name: Install dependencies & setup configs
+        run: |
+              yarn setup:tools
+
+      - name: Install dependencies
+        run: |
+            yarn
+            composer install
+            yarn build
+            yarn wp-env start
+
+      - name: Run PHP unit tests
+        run: |
+            yarn test:php

.wp-env.json

@@ -0,0 +1,18 @@
+{
+	"core": "WordPress/WordPress#master",
+	"mappings": {
+		"wp-content/mu-plugins": "./mu-plugins"
+	},
+	"env": {
+		"tests": {
+			"config": {
+				"WP_ENVIRONMENT_TYPE": false
+			},
+			"mappings": {
+				"vendor": "./vendor",
+				"phpunit": "./phpunit",
+				"phpunit.xml.dist": "./phpunit.xml.dist"
+			}
+		}
+	}
+}

composer.json

@@ -17,14 +17,15 @@
 			"url": "[email protected]:WordPress/wporg-repo-tools.git"
 		}
 	],
-	"require": {
-		"composer/installers": "~1.0"
-	},
 	"require-dev": {
+		"composer/installers": "~1.0",
 		"dealerdirect/phpcodesniffer-composer-installer": "^0.7.0",
 		"phpcompatibility/phpcompatibility-wp": "*",
+		"phpunit/phpunit": "^9.5",
 		"wp-coding-standards/wpcs": "2.*",
-		"wporg/wporg-repo-tools": "dev-trunk"
+		"wp-phpunit/wp-phpunit": "~6.0",
+		"wporg/wporg-repo-tools": "dev-trunk",
+		"yoast/phpunit-polyfills": "^1.0"
 	},
 	"config": {
 		"allow-plugins": {