Add Github PR testing

.github/workflows/test.yml

@@ -0,0 +1,29 @@
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+name: Test
+
+jobs:
+  build:
+    runs-on: ${{ matrix.operating-system }}
+    strategy:
+      matrix:
+        include:
+          - operating-system: ubuntu-latest
+            php: 7.4
+            phpunit: 8
+          - operating-system: ubuntu-latest
+            php: 8.4
+            phpunit: 9
+    name: PHP ${{ matrix.php }}
+    steps:
+      - uses: actions/checkout@v3
+      - uses: php-actions/composer@v6
+      - uses: php-actions/phpunit@v3
+        with:
+          configuration: phpunit.xml.dist
+          version: ${{ matrix.phpunit }}
+          php_version:  ${{ matrix.php }}

.gitignore

@@ -1,5 +1,6 @@
 *~
 .idea/
+extern/
 vendor/
 bin/phpunit
 bin/civistrings.phar

README.md

@@ -49,14 +49,24 @@ civistrings -o myfile.pot myfolder
 find -name '*.js' | civistrings - -o myfile.pot
 ```
 
-## Development and Testing
+## Development
 
-The "examples" folder includes a series of example input files and expected
-output files.  To see if the examples are correctly processed, simply run
-`phpunit`.
+For a full set of development and testing activities, you will need:
 
-If you need to add new examples or change the behavior of the test, update
-`tests/Command/ExtractCommandTest.php`.
+* [`git`](https://git-scm.com)
+* [`composer`](https://getcomposer.org/)
+* [`box`](http://box-project.github.io/box2/)
+* [`phpunit`](https://phpunit.de/)
+
+> __TIP__: If you use `nix-shell`, it will provide `php`, `git`, `composer`,
+> `box`, `phpunit8`, and `phpunit9`.
+
+### Testing
+
+Tests are based on a series of example files (e.g. `./examples/ex1.php` and
+the corresponding `./examples/ex1.pot`).
+
+To run the tests, simply call your favorite instance of `phpunit`.
 
 ### Build
 

composer.json

@@ -26,8 +26,5 @@
             "php": "7.4.0"
         },
         "bin-dir": "bin"
-    },
-    "require-dev": {
-        "phpunit/phpunit": "9.6.*"
     }
 }