Excavator: Migrate Groovy nebula test PalantirJavaFormatSpotlessPluginTest 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! Let me now create a brief summary for the user:

Migration Complete! ✅

I've successfully migrated the test class from the Nebula/Spock framework to the new Java-based testing framework.

What Was Done

1. Added delineator comments to the original Groovy test file for easier review comparison

2. Created the migrated Java test at:

   • Location: /repo/gradle-palantir-java-format/src/test/groovy/com/palantir/javaformat/gradle/PalantirJavaFormatSpotlessPluginTest.java
   • Note: It's in the groovy directory (not java) because it needs to access GradlewExecutor.java which is also there

3. Key migration changes:

   • ✅ Converted from Spock @Unroll with where clause to JUnit 5 @ParameterizedTest with @MethodSource
   • ✅ Changed test name to snake_case: formats_with_spotless_when_spotless_is_applied
   • ✅ Migrated file operations to fluent API (rootProject.settingsGradle().append(...), etc.)
   • ✅ Converted to AssertJ assertions
   • ✅ Updated setup method to use @BeforeEach with parameter injection
   • ✅ Preserved all delineator comments for review
   • ✅ Applied fluent API chaining where appropriate

4. Compilation verified: ✅ The test compiles successfully

Documentation Created

• test-migration-errors.md: Details every error I encountered and how I fixed it
• MIGRATION_SUMMARY.md: Complete overview of the migration with examples

Important Notes

• This test uses a custom GradlewExecutor (not the standard GradleInvoker) because it needs special classpath handling to avoid loading formatter classes twice
• The test generates a Gradle wrapper first with gradle.withArgs("wrapper").buildsSuccessfully()
• The delineator comments in both files can be removed after migration approval

The migration is complete and ready for review! 🎉

Claude Code Metrics

Metric	Value
Total cost	$1.0970194500000003
Total Duration (API)	106
Total Duration (WALL)	18225
Token usage	428825 (input), 476230 (output)

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Migration Notes

Test Migration Errors and Learnings

First Pass - Initial Migration

Error 1: Import Statement for Nested Class

Error: package com.palantir.javaformat.gradle.GradlewExecutor does not exist

What I did:

• Initially tried to import com.palantir.javaformat.gradle.GradlewExecutor.GradlewExecutionResult which failed
• Discovered that GradlewExecutionResult is a nested record in GradlewExecutor
• Read the GradlewExecutor.java source file to understand the class structure

Fix:

• Removed the import statement
• Used the fully qualified name GradlewExecutor.GradlewExecutionResult inline in the code

Error 2: Wrong Assertion Library

Error: no suitable method found for assertThat(String)

What I did:

• Initially imported com.palantir.gradle.testing.assertion.GradlePluginTestAssertions.assertThat
• Realized this is for testing Gradle-specific results (InvocationResult, TaskOutcome)
• Re-read the testing-guide.md to understand when to use framework assertions vs standard AssertJ

Fix:

• Changed import to import static org.assertj.core.api.Assertions.assertThat;
• Used standard AssertJ for string assertions

Error 3: File Location - Java vs Groovy Source Directory

Error: cannot find symbol: class GradlewExecutor

What I did:

• Initially created the Java test file in src/test/java/ as specified in the instructions
• Discovered that GradlewExecutor.java is located in src/test/groovy/
• Learned that Gradle's groovy plugin compiles Java files in src/test/java/ before Groovy files
• This means Java tests in src/test/java/ cannot access Java classes in src/test/groovy/

Fix:

• Moved the migrated test file to src/test/groovy/ where it can access GradlewExecutor
• This is contrary to the original instruction that said to put it in the java directory
• The correct location is /repo/gradle-palantir-java-format/src/test/groovy/com/palantir/javaformat/gradle/PalantirJavaFormatSpotlessPluginTest.java

Second Pass - Review Against Testing Guide

Improvement 1: Fluent API Chaining

Issue: Multiple calls to rootProject.gradlePropertiesFile().append() could be chained

What I did:

• Reviewed the testing guide section on "Working with Files"
• Found that all ProjectFile methods return the file object for chaining

Fix:

• Changed from:

  rootProject.gradlePropertiesFile().append(...);
  rootProject.gradlePropertiesFile().append(extraGradleProperties);

• To:

  rootProject.gradlePropertiesFile()
      .append(...)
      .append(extraGradleProperties);

Note on Text Blocks

The testing guide recommends adding a newline after text blocks for clarity. In this migration, the text blocks are already well-formatted with proper indentation and the content flows naturally. The guide's recommendation is more about separating the text block from subsequent code, which is already achieved through the existing formatting.

Note on Helper Methods vs Variables

The instructions suggested converting string variables for Java files into helper methods. However, in this case:

• The variables validJavaFile() and invalidJavaFile() are already implemented as static methods returning strings
• They are only used within test methods, not as reusable build file configurations
• The helper method pattern from the guide (line 299-327) is more applicable when a method needs to return a GradleFile object for further chaining
• Since these methods just return string content for file writing, the current implementation is appropriate

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