Try #7 to run tests on github workflow.

.github/workflows/run-tests.yml

@@ -1,28 +1,20 @@
-name: Java CI with Maven
-
-on:
-  push:
-    branches:
-      - main
-  pull_request:
-    branches:
-      - main
-
+name: tests
+on: push
 jobs:
-  build:
-
+  run_tests:
     runs-on: ubuntu-latest
-
     steps:
-      - uses: actions/checkout@v2
-
-      - name: Set up JDK 1.8
-        uses: actions/setup-java@v2
+      - name: Checkout the repository
+        uses: actions/checkout@v2
+      - name: Set up JDK 8
+        uses: actions/setup-java@v1
         with:
-          java-version: '1.8'
-
-      - name: Build with Maven
-        run: mvn -B clean package --file pom.xml
-
-      - name: Run tests
-        run: mvn test --file pom.xml
+          java-version: 8
+      - name: Cache Maven packages
+        uses: actions/cache@v2
+        with:
+          path: ~/.m2
+          key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
+          restore-keys: ${{ runner.os }}-m2
+      - name: Run tests with Maven
+        run: mvn -B test --file pom.xml