Test config-cache support for multiple builds in one job

.github/workflows/integTest-caching-configuration-cache.yml

@@ -26,8 +26,13 @@ jobs:
       with:
         build-root-directory: __tests__/samples/groovy-dsl
         arguments: test --configuration-cache
+    - name: Second build with configuration-cache enabled
+      uses: ./
+      with:
+        build-root-directory: __tests__/samples/kotlin-dsl
+        arguments: test --configuration-cache
 
-  # Test that the project-dot-gradle cache will cache and restore configuration-cache
+  # Test restore configuration-cache
   configuration-cache:
     needs: seed-build
     strategy:
@@ -46,6 +51,25 @@ jobs:
         arguments: test --configuration-cache
         cache-read-only: true
 
+  # Test restore configuration-cache from second build invocation
+  configuration-cache-2:
+    needs: seed-build
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - name: Checkout sources
+      uses: actions/checkout@v2
+    - name: Execute Gradle build and verify cached configuration
+      uses: ./
+      env: 
+        VERIFY_CACHED_CONFIGURATION: true
+      with:
+        build-root-directory: __tests__/samples/kotlin-dsl
+        arguments: test --configuration-cache
+        cache-read-only: true
+
   # Check that the build can run when no extracted cache entries are restored
   no-extracted-cache-entries-restored:
     needs: seed-build

__tests__/samples/kotlin-dsl/build.gradle.kts

@@ -16,3 +16,15 @@ dependencies {
 tasks.test {
     useJUnitPlatform()
 }
+
+tasks.named("test").configure {
+    // Use an environment variable to bypass config-cache checks
+    if (System.getenv("VERIFY_CACHED_CONFIGURATION") != null) {
+        throw RuntimeException("Configuration was not cached: unexpected configuration of test task")
+    }
+    doLast {
+        if (System.getProperties().containsKey("verifyCachedBuild")) {
+            throw RuntimeException("Build was not cached: unexpected execution of test task")
+        }
+    }
+}