[CI] split tests by paths

.github/workflows/tests.yaml

@@ -9,12 +9,13 @@ jobs:
         strategy:
             fail-fast: false
             matrix:
-                php: ['7.4', '8.0']
-                include:
-                    - php: '7.3'
-                      dependencies: 'lowest'
+                php: ['7.3', '7.4', '8.0']
+                path:
+                    - tests
+                    - rules-tests
+                    - packages-tests
 
-        name: PHP ${{ matrix.php }} tests
+        name: PHP ${{ matrix.php }} tests for ${{ matrix.path }}
         steps:
             -   uses: actions/checkout@v2
 
@@ -23,10 +24,6 @@ jobs:
                     php-version: ${{ matrix.php }}
                     coverage: none # disable xdebug, pcov
 
-            -   run: composer update --prefer-lowest --no-progress --ansi
-                if: "matrix.dependencies == 'lowest'"
+            -   uses: "ramsey/composer-install@v1"
 
-            -   run: composer install --no-progress --ansi
-                if: "matrix.dependencies != 'lowest'"
-
-            -   run: vendor/bin/phpunit
+            -   run: vendor/bin/phpunit ${{ matrix.path }}