Fix check for config-cache usage

Now that environment variable reads are auto-detected by Gradle 7.4,
we need a different mechanism to check that the configuration cache is
being used successfully.

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

@@ -46,11 +46,16 @@ jobs:
       uses: ./
       with:
         cache-read-only: true
-    - name: Execute Gradle build and verify cached configuration
-      env: 
-        VERIFY_CACHED_CONFIGURATION: true
+    - name: Groovy build with configuration-cache enabled
+      id: execute
       working-directory: __tests__/samples/groovy-dsl
       run: ./gradlew test --configuration-cache
+    - name: Check that configuration-cache was used
+      if: ${{ steps.execute.outputs.task_configured == 'yes' }}
+      uses: actions/github-script@v5
+      with:
+        script: |
+          core.setFailed('Configuration cache was not used - task was configured unexpectedly')
 
   # Check that the build can run when no extracted cache entries are restored
   no-extracted-cache-entries-restored:
@@ -123,8 +128,14 @@ jobs:
       uses: ./
       with:
         cache-read-only: true
-    - name: Execute 'test' again and verify cached configuration
-      env: 
-        VERIFY_CACHED_CONFIGURATION: true
+    - name: Execute 'test' again with configuration-cache enabled
+      id: execute
       working-directory: __tests__/samples/kotlin-dsl
       run: ./gradlew test --configuration-cache
+    - name: Check that configuration-cache was used
+      if: ${{ steps.execute.outputs.task_configured == 'yes' }}
+      uses: actions/github-script@v5
+      with:
+        script: |
+          core.setFailed('Configuration cache was not used - task was configured unexpectedly')
+

__tests__/samples/groovy-dsl/build.gradle

@@ -11,10 +11,9 @@ dependencies {
 }
 
 tasks.named("test").configure {
-    // Use an environment variable to bypass config-cache checks
-    if (System.getenv('VERIFY_CACHED_CONFIGURATION') != null) {
-        throw new RuntimeException("Configuration was not cached: unexpected configuration of test task")
-    }
+    // Echo an output value so we can detect configuration-cache usage
+    println "::set-output name=task_configured::yes"
+
     doLast {
         if (System.properties.verifyCachedBuild) {
             throw new RuntimeException("Build was not cached: unexpected execution of test task")

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

@@ -18,10 +18,9 @@ tasks.test {
 }
 
 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")
-    }
+    // Echo an output value so we can detect configuration-cache usage
+    println("::set-output name=task_configured::yes")
+
     doLast {
         if (System.getProperties().containsKey("verifyCachedBuild")) {
             throw RuntimeException("Build was not cached: unexpected execution of test task")