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.

Excellent! The migration is complete. Let me create a summary of what was done:

Summary

I've successfully migrated the test class from the Nebula testing framework to the new Java-based testing framework. Here's what was accomplished:

Files Modified/Created:

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

   • Added delineator comments to assist with human review

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

   • Converted from Groovy/Spock to Java/JUnit 5
   • Uses @GradlePluginTests annotation
   • Uses parameter injection for GradleInvoker and RootProject
   • Test name converted to snake_case: formats_test_report_stdout_and_stderr
   • Applied plugin using structured API: .plugins().add("com.palantir.witchcraft-logging-testreport")
   • Used .testSourceSet().java().writeClass() for creating test Java files
   • Used fluent file assertion API: .assertThat().content() with chained assertions
   • Preserved all delineator comments from original test

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

   • Documented the one compilation error encountered and how it was fixed
   • Noted the multi-version testing configuration difference

Key Changes:

• Method mappings: runTasksSuccessfully() → .buildsSuccessfully(), runTasksWithFailure() → .buildsWithFailure()
• Assertion approach: Changed from reading file text and asserting on string to using .assertThat().content() fluent API
• Multi-version testing: Now configured centrally in build.gradle via gradleTestUtils extension rather than per-test
• Plugin application: Changed from Nebula's applyPlugin(TestReportFormattingPlugin) to structured API .plugins().add("com.palantir.witchcraft-logging-testreport")

Verification:

The test compiles successfully: ✅

BUILD SUCCESSFUL in 10s

All best practices from the testing-guide.md have been followed, and the test is ready for use.

Claude Code Metrics

Metric	Value
Total cost	$0.5404200499999998
Total Duration (API)	87
Total Duration (WALL)	8478
Token usage	186664 (input), 200280 (output)

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Migration Notes

Test Migration Errors and Fixes

Migration: TestReportFormattingPluginIntegrationSpec.groovy → TestReportFormattingPluginIntegrationTest.java

Initial Pass

Error 1: Incorrect assertion API usage

Error Message:

error: no suitable method found for assertThat(String)

Problem:
I initially read the file content using .text() and tried to assert on the String directly using assertThat(htmlReport). However, the GradlePluginTestAssertions.assertThat() method only accepts TaskOutcome or InvocationResult, not arbitrary strings.

Solution:
According to the testing-guide.md section on "File Assertions" (lines 677-680), the correct approach is to use the fluent file assertion API:

project.buildGradle().assertThat().content()
    .contains("plugins")
    .doesNotContain("application");

Changed from:

String htmlReport = rootProject
    .buildDir()
    .file("reports/tests/test/classes/com.palantir.SimpleTest.html")
    .text();

assertThat(htmlReport)
    .contains("==Service==")
    // ... more assertions

To:

rootProject
    .buildDir()
    .file("reports/tests/test/classes/com.palantir.SimpleTest.html")
    .assertThat()
    .content()
    .contains("==Service==")
    // ... more assertions

Information Source: Testing guide section on "File Assertions" which shows using .assertThat().content() for AssertJ string assertions on file content.

Observations

Multi-Version Testing

The original Groovy test explicitly tested against three Gradle versions: 7.6.4, 8.8, and GradleVersion.current().

In the new framework, multi-version testing is configured via the gradleTestUtils extension in build.gradle. The current configuration only specifies one version:

gradleTestUtils {
    gradleVersions = ['8.14.3']
    configurationCacheEnabled = true
}

According to the testing-guide.md (lines 132-146), the framework automatically runs each test against multiple Gradle versions when configured. Since the build.gradle only specifies 8.14.3, the test will only run against that version, not the three versions from the original test.

Note: This is not an error in the migration itself, but a change in test coverage. The multi-version testing configuration is now centralized in build.gradle rather than per-test. If broader version coverage is desired, the build.gradle would need to be updated.

Second Pass Review

After reviewing the testing-guide.md and instructions:

All best practices followed:

1. ✅ Using @GradlePluginTests annotation
2. ✅ Parameter injection for test components
3. ✅ Test name converted to snake_case
4. ✅ Using .buildsSuccessfully() and .buildsWithFailure() methods
5. ✅ Using fluent file assertion API
6. ✅ Using chained assertions for multiple checks
7. ✅ Delineator comments preserved from original test
8. ✅ Text blocks used for Java source code
9. ✅ Plugin added via .plugins().add() structured API
10. ✅ Compiled successfully

No additional changes needed.

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