Excavator: Migrate Groovy nebula test ConfigurationCacheTest to the new Java Junit framework

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Changes produced by the roomba/migrate-gradle-testing-junit-framework check.

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Claude Execution Message

Claude finished running successfully.

Perfect! The migration is complete and successful. Let me provide a summary:

Migration Summary

I have successfully migrated the ConfigurationCacheTest from the old Nebula/Spock framework to the new Java-based testing framework. Here's what was accomplished:

Files Modified/Created

1. Original Groovy test (gradle-baseline-java/src/test/groovy/com/palantir/baseline/ConfigurationCacheTest.groovy):

   • Added delineator comments for review assistance

2. New Java test (gradle-baseline-java/src/test/java/com/palantir/baseline/ConfigurationCacheTest.java):

   • Migrated the single test method
   • Used @GradlePluginTests annotation
   • Implemented proper parameter injection (RootProject, GradleInvoker)
   • Used snake_case test naming convention
   • Leveraged automatic configuration cache testing from the framework

3. Migration documentation (test-migration-errors.md):

   • Documented the key error encountered (Error Prone check for plugin applications)
   • Explained the solution pattern for handling buildscript blocks with plugins
   • Noted observations about configuration cache handling improvements
   • Documented best practices for text block indentation

Key Migration Insights

1. Plugin Application Pattern: The new framework enforces using .plugins().add() instead of apply plugin: syntax through Error Prone checks. The framework automatically positions plugin blocks after buildscript blocks.

2. Configuration Cache Simplification: The old framework required explicit helper methods (runTasksWithConfigurationCacheAndCheck()), while the new framework handles this automatically when gradleTestUtils.configurationCacheEnabled = true is set in build.gradle.

3. All Tests Migrated: The original Groovy file contained 1 test, and all 1 test has been migrated to the Java file.

The migrated test compiles successfully and follows all the best practices outlined in the testing guide.

Claude Code Metrics

Metric	Value
Total cost	$0.64291325
Total Duration (API)	92
Total Duration (WALL)	9327
Token usage	190210 (input), 220097 (output)

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Migration Notes

Test Migration Errors and Learnings

Migration: ConfigurationCacheTest.groovy → ConfigurationCacheTest.java

Error 1: Using apply plugin: inside append() calls

Error Message:

error: [GradleTestPluginsBlock] Plugins must be added using .plugins().add() method.
Use gradleFile.plugins().add("plugin-id") instead.

What I Did Wrong:
I initially tried to migrate the Groovy code that used apply plugin: inside a multi-line string passed to buildFile << by keeping the same pattern in Java with .append():

rootProject.buildGradle().append("""
    buildscript { ... }

    apply plugin: 'com.palantir.consistent-versions'
    apply plugin: 'com.palantir.baseline'
    apply plugin: 'com.palantir.java-format'
    apply plugin: 'java'

    repositories { ... }
    """);

How I Fixed It:
The new framework has an Error Prone check that enforces using the structured .plugins().add() API instead of apply plugin: syntax. The solution was to:

1. Keep the buildscript block in an append() call (it's not a plugin application)
2. Use the structured .plugins().add() API for all plugin applications
3. The framework automatically positions the plugins {} block after any buildscript {} blocks

// First, add the buildscript block
rootProject.buildGradle().append("""
    buildscript { ... }
    """);

// Then use the structured API for plugins (will be positioned after buildscript automatically)
rootProject.buildGradle()
    .plugins()
    .add("com.palantir.consistent-versions")
    .add("com.palantir.baseline")
    .add("com.palantir.java-format")
    .add("java");

// Finally, add remaining configuration
rootProject.buildGradle().append("""
    repositories { ... }
    """);

Where I Found the Information:

1. The Error Prone check itself pointed me to use .plugins().add()
2. Testing guide section "Plugin Management" explains the .plugins() API
3. Testing guide section "Don't Use buildscript Blocks for External Plugins" clarified the pattern
4. Looking at the GradleFile.java source code, I saw ensurePluginsBlockPosition() which repositions plugins blocks after buildscript blocks

Observation 1: Configuration Cache Handling

What Changed:
In the old Nebula framework, the test extended ConfigurationCacheSpec which had helper methods like runTasksWithConfigurationCacheAndCheck() that:

• Ran the build twice
• Verified "Configuration cache entry stored." message on first run
• Verified "Configuration cache entry reused." message on second run

In the new framework, configuration cache testing is automatic when gradleTestUtils.configurationCacheEnabled = true is set in build.gradle.

Migration Pattern:
Simply call gradle.withArgs("classes").buildsSuccessfully() and the framework automatically:

• Runs the build twice
• Verifies cache storage on first run
• Verifies cache reuse on second run
• Fails the test with UnexpectedConfigurationCacheFailure if issues are detected

This is much simpler and more declarative than the old pattern.

Observation 2: Text Block Indentation

Best Practice:
Java text blocks should use consistent indentation that aligns with the closing """. The framework examples show text blocks with one level of indentation:

rootProject.buildGradle().append("""
    buildscript {
        repositories {
            mavenCentral()
        }
    }
    """);

Not:

rootProject.buildGradle().append("""
        buildscript {
            repositories {
                mavenCentral()
            }
        }
        """);

The first pattern is cleaner and easier to read.

Second Pass Review

After completing the initial migration, I reviewed the test against the testing guide and made the following improvements:

1. Fixed text block indentation - Reduced the indentation inside text blocks to match the pattern used in testing guide examples

2. Verified all best practices were followed:

   • ✅ @GradlePluginTests annotation
   • ✅ Parameter injection (RootProject, GradleInvoker)
   • ✅ snake_case test names
   • ✅ Delineator comments preserved
   • ✅ .plugins().add() API usage
   • ✅ Text blocks for multi-line strings
   • ✅ Configuration cache handled automatically
   • ✅ External plugin in gradlePluginForTesting
   • ✅ .buildsSuccessfully() method

3. Verified completeness - Confirmed all tests from the original Groovy file (1 test) were migrated to the new Java file (1 test)

No additional issues were found in the second pass.

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