Excavator: Migrate Groovy nebula test TestReportFormattingPluginIntegrationSpec 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. Let me create a summary of what was accomplished:

Summary

I have successfully migrated the test class TestReportFormattingPluginIntegrationSpec.groovy from the Nebula/Spock framework to the new Java-based testing framework. Here's what was completed:

Files Created/Modified:

1. Original Groovy Test (gradle-witchcraft-logging/src/test/groovy/com/palantir/witchcraft/java/logging/gradle/testreport/TestReportFormattingPluginIntegrationSpec.groovy):

   • Added delineator comments for review purposes

2. New Java Test (gradle-witchcraft-logging/src/test/java/com/palantir/witchcraft/java/logging/gradle/testreport/TestReportFormattingPluginIntegrationTest.java):

   • Migrated from Groovy/Spock to Java/JUnit 5
   • Uses @GradlePluginTests annotation
   • Uses @AdditionallyRunWithGradle({"7.6.4", "8.8"}) for multi-version testing
   • Test name changed to snake_case: formats_test_report_stdout_and_stderr
   • Uses parameter injection for GradleInvoker and RootProject
   • Uses framework fluent APIs for file operations and assertions
   • All delineator comments preserved from original

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

   • Documented all errors encountered and fixes applied
   • Included detailed explanations of how issues were resolved
   • Added final review notes explaining migration decisions

Key Migration Changes:

• Framework: Nebula/Spock → Java/JUnit 5 with @GradlePluginTests
• Multi-version testing: Spock where: clause → @AdditionallyRunWithGradle annotation
• Plugin application: applyPlugin(TestReportFormattingPlugin) → .plugins().add("com.palantir.witchcraft-logging-testreport")
• Test execution: runTasksSuccessfully() → gradle.withArgs().buildsSuccessfully()
• Failed test execution: runTasksWithFailure() → gradle.withArgs().buildsWithFailure()
• Assertions: Groovy boolean checks → Framework fluent assertions with .assertThat().content()
• File operations: writeUnitTest() → rootProject.testSourceSet().java().writeClass()

Verification:

✅ The migrated test compiles successfully with ./gradlew :gradle-witchcraft-logging:compileTestJava

All tests have been migrated following the testing guide's best practices, and the code is ready for review.

Claude Code Metrics

Metric	Value
Total cost	$0.9607552000000003
Total Duration (API)	264
Total Duration (WALL)	13633
Token usage	321584 (input), 322079 (output)

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Migration Notes

Test Migration Errors and Fixes

Migration: TestReportFormattingPluginIntegrationSpec → TestReportFormattingPluginIntegrationTest

Initial Attempt - Wrong Package Names for Annotations

Error:

error: package com.palantir.gradle.testing.annotation does not exist
import com.palantir.gradle.testing.annotation.AdditionallyRunWithGradle;

Root Cause:
I initially assumed the annotation classes were in the com.palantir.gradle.testing.annotation package based on common convention, but they are actually in com.palantir.gradle.testing.junit package.

Fix:
Changed imports from:

import com.palantir.gradle.testing.annotation.AdditionallyRunWithGradle;
import com.palantir.gradle.testing.annotation.GradlePluginTests;

to:

import com.palantir.gradle.testing.junit.AdditionallyRunWithGradle;
import com.palantir.gradle.testing.junit.GradlePluginTests;

How I Found the Fix:
Used find command to locate the actual annotation class files in the framework:

find /tmp/gradle-plugin-testing/gradle-plugin-testing-junit/src/main/java -name "GradlePluginTests.java"

Initial Attempt - Missing AssertJ Import for String Assertions

Error:

error: no suitable method found for assertThat(String)
    method GradlePluginTestAssertions.assertThat(TaskOutcome) is not applicable
      (argument mismatch; String cannot be converted to TaskOutcome)

Root Cause:
The GradlePluginTestAssertions.assertThat() method is specifically for testing framework types (InvocationResult, TaskOutcome), not for general assertions like strings.

Fix:
Added AssertJ import:

import static org.assertj.core.api.Assertions.assertThat;

How I Found the Fix:
The testing guide shows that string assertions should use standard AssertJ methods. However, I later realized a better approach is to use the framework's fluent file assertion API.

Second Pass - Using Fluent File Assertion API

Change:
Instead of reading the file content into a String variable and asserting on it:

String htmlReport = rootProject.buildDir().file("...").text();
assertThat(htmlReport).contains("==Service==");

Changed to use the framework's fluent API:

rootProject.buildDir()
    .file("...")
    .assertThat()
    .content()
    .contains("==Service==");

Reason:
This is more idiomatic and follows the testing guide's recommendation (lines 703-707). It also removes the need for an intermediate variable and the AssertJ static import.

How I Found the Fix:
Reviewed the testing guide section on "File Assertions" which shows this pattern as the preferred approach.

Key Learnings

1. Always check actual package names: Don't assume package structures - use find or grep to locate classes in the framework source.

2. Prefer framework-provided fluent APIs: The testing framework provides specialized fluent assertion methods (like .assertThat().content()) that are more idiomatic than extracting values and using general assertion libraries.

3. Read the testing guide thoroughly: The guide has specific sections on best practices for assertions, file operations, etc. Following these patterns from the start saves refactoring time.

4. Multi-version testing: The @AdditionallyRunWithGradle annotation makes it easy to test across multiple Gradle versions. Just add the annotation at the class level with an array of version strings.

Final Review Notes

After completing the migration and reviewing the testing guide:

1. Plugin application: The old test used applyPlugin(TestReportFormattingPlugin) (a Nebula helper that applies a plugin by class reference). In the new framework, we use the plugin ID string "com.palantir.witchcraft-logging-testreport" with .plugins().add(). This is the correct approach for plugins defined in the same project.

2. Multi-version testing strategy: The original test had GRADLE_VERSIONS = ["7.6.4", "8.8", GradleVersion.current().getVersion()] with a Spock where: clause. In the new framework:

   • The global config (gradle/gradle-test-versions.yml) defines base versions (8.14.3)
   • @AdditionallyRunWithGradle({"7.6.4", "8.8"}) adds these versions to the test matrix
   • The current version is automatically the global configured version
   • Result: Test runs on 7.6.4, 8.8, and 8.14.3 (similar coverage to original)

3. Test structure: The test correctly follows the framework patterns:

   • No @BeforeEach needed since the test is self-contained
   • Uses parameter injection for GradleInvoker and RootProject
   • Uses fluent APIs for all file operations
   • Uses framework assertion methods where appropriate

4. Java source handling: The test Java class content is kept as a static final String constant (matching the original pattern), then passed to writeClass() which automatically creates it in the correct location.

All tests compile successfully and follow framework best practices.

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