Excavator: Migrate Groovy nebula test PalantirJavaFormatIdeaPluginTest 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 provide a summary of what was accomplished:

Migration Summary

I have successfully migrated the test class PalantirJavaFormatIdeaPluginTest from the Nebula/Groovy testing framework to the new Java-based testing framework. Here's what was done:

Files Modified/Created:

1. Original Groovy test file (gradle-palantir-java-format/src/test/groovy/com/palantir/javaformat/gradle/PalantirJavaFormatIdeaPluginTest.groovy):

   • Added delineator comments to help with review comparison

2. New Java test file (gradle-palantir-java-format/src/test/java/com/palantir/javaformat/gradle/PalantirJavaFormatIdeaPluginTest.java):

   • Fully migrated test with the same functionality
   • Uses @GradlePluginTests annotation
   • Uses JUnit 5 @ParameterizedTest with @CsvSource for data-driven testing
   • Implements proper parameter injection for GradleInvoker and RootProject
   • Follows all best practices from the testing guide

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

   • Comprehensive documentation of all errors encountered and how they were fixed
   • Key learnings from the migration process

Key Changes Made:

• Test method name: Changed from "idea_configuresXmlFiles"() (Groovy string) to idea_configures_xml_files() (Java snake_case)
• Parameterization: Converted Spock's where: block to JUnit 5's @CsvSource
• XML Parsing: Switched from XmlSlurper to XmlParser for better Java compatibility
• Assertions: Used standard AssertJ for boolean assertions
• Build file manipulation: Used the structured plugins().add() API and varargs append() method
• Helper method: Created standardBuildFile() helper matching the original test's structure

Compilation Status:

✅ The new test compiles successfully with no errors or warnings

The migrated test maintains complete feature parity with the original Groovy test while following all best practices of the new testing framework.

Claude Code Metrics

Metric	Value
Total cost	$1.2244031000000002
Total Duration (API)	82
Total Duration (WALL)	20415
Token usage	449458 (input), 519956 (output)

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Migration Notes

Test Migration Errors and Learnings

Migration of PalantirJavaFormatIdeaPluginTest

First Pass: Initial Migration

Error 1: Incorrect method name for accessing project directory

Error: cannot find symbol: method projectDir()
Cause: Used rootProject.projectDir() instead of the correct API
Fix: Changed to rootProject.path() - the RootProject is a record with a path field, not a method called projectDir()
Learning: Always check the actual API of the testing framework objects. RootProject is a Java record with a path() accessor method.

Error 2: Wrong GPathResult import

Error: incompatible types: groovy.util.slurpersupport.GPathResult cannot be converted to groovy.xml.slurpersupport.GPathResult
Cause: Used the wrong import for GPathResult from groovy.xml instead of groovy.util
Fix: Changed import to groovy.util.slurpersupport.GPathResult
Learning: Groovy has multiple GPathResult classes in different packages - need to use the correct one from groovy.util.slurpersupport

Error 3: Wrong assertThat for boolean values

Error: no suitable method found for assertThat(boolean) - GradlePluginTestAssertions doesn't have assertThat for primitives
Cause: Used the framework's assertion API which only supports TaskOutcome and InvocationResult
Fix: Changed to use standard AssertJ: import static org.assertj.core.api.Assertions.assertThat;
Learning: The framework's assertion API is specialized for Gradle testing results. For general assertions like booleans, use standard AssertJ.

Error 4: Cannot use getAt() with String parameter on GPathResult

Error: no suitable method found for getAt(String) - GPathResult.getAt() only accepts int or IntRange
Cause: Tried to use getAt("@name") to access XML attributes, which doesn't work in Java
Fix: Switched from XmlSlurper to XmlParser and used Node-based traversal with ((Map<?, ?>) node.attributes()).get("name")
Learning: XmlSlurper's GPath syntax (like it.@name) that works in Groovy doesn't translate well to Java. XmlParser with Node-based iteration is more Java-friendly.

Error 5: Cannot use lambda with Groovy Closure methods

Error: incompatible types: Closure is not a functional interface
Cause: Tried to use Java lambdas with Groovy's findAll() and find() methods
Fix: Switched from using closures to explicit iteration with for loops and Node-based XML parsing
Learning: Groovy's closure-based APIs like findAll() and find() don't accept Java lambdas. Need to use traditional iteration in Java.

Second Pass: Error Prone Check Fixes

Error 6: GradleTestStringFormatting check violation

Error: Use the varargs overload of methods to get syntax highlighting, rather than manually formatting strings
Cause: Used String.format() to build NATIVE_CONFIG constant and passed it to append()
Fix: Removed the constant and used append() with varargs directly: append("palantirJavaFormatNative files(\"%s\")", NATIVE_IMAGE_FILE.toPath())
Learning: The framework encourages using varargs overloads for better IDE support. Don't pre-format strings, pass format arguments directly.

Error 7: Deprecated XmlParser usage

Error: groovy.util.XmlParser is deprecated
Cause: XmlParser is deprecated but still needed for Java-friendly XML parsing
Fix: Added @SuppressWarnings("deprecation") annotation on the xmlParser variable
Learning: Sometimes deprecated APIs are still the best option for Java code working with Groovy libraries. Use @SuppressWarnings appropriately.

Error 8: GradleTestPluginsBlock check violation

Error: Plugins must be added using .plugins().add() method
Cause: Used apply plugin: 'idea' in the append() call within the helper method
Fix: Changed to use plugins().add("idea") instead of applying plugins in the append() block
Learning: The framework strongly enforces using the structured plugins() API. Never use apply plugin: in append() calls - always use the plugins().add() API.

Third Pass: Style Improvements

Improvement 1: Removed unused imports

Action: Removed import java.util.List; which was not used
Learning: Keep imports clean - remove unused imports.

Improvement 2: Chained plugin additions

Action: Changed from two separate calls to chained calls:

// Before
rootProject.buildGradle().plugins().add("com.palantir.java-format-idea");
rootProject.buildGradle().plugins().add("idea");

// After
rootProject
        .buildGradle()
        .plugins()
        .add("com.palantir.java-format-idea")
        .add("idea");

Learning: Chain fluent API calls for better readability.

Summary of Key Learnings

1. Use correct framework APIs: Check method signatures - path() not projectDir()
2. Use standard AssertJ for general assertions: Framework assertions are specialized for Gradle results
3. XmlParser is better than XmlSlurper for Java: Node-based iteration works better than GPath in Java
4. Don't pre-format strings: Use varargs overloads for better IDE support
5. Always use plugins().add(): Never use apply plugin: in append() calls
6. Chain fluent APIs: Makes code more readable and idiomatic
7. Groovy closure APIs don't work with Java lambdas: Use explicit iteration instead

Test Coverage Note

The migrated test maintains the same coverage as the original:

• Tests that the plugin configures XML files correctly
• Parameterized to test both with and without native formatter
• Validates presence of required components in IntelliJ IDEA configuration files
• Checks for PalantirJavaFormatSettings component
• Checks for implementationClassPath option
• Conditionally checks for nativeImageClassPath option when native formatter is enabled
• Validates FormatOnSaveOptions and OptimizeOnSaveOptions in workspace.xml

To enable or disable this check, please contact the maintainers of Excavator.