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Validating Lint Registry Implementation in ButterKnife

This test suite validates the functionality of the LintRegistry class within ButterKnife’s lint module. It focuses on ensuring proper registration and detection of custom lint issues, specifically for R2 usage validation.

Test Coverage Overview

The test coverage focuses on verifying the correct registration of lint issues within the ButterKnife framework.

Key areas tested include:

Validation of registered lint issues
Verification of InvalidR2UsageDetector integration
Issue collection completeness check

Implementation Analysis

The testing approach utilizes JUnit’s straightforward assertion methodology combined with Google Truth for enhanced assertion readability. The test implements a focused single-responsibility pattern, specifically targeting the getIssues() method functionality.

Framework features utilized:

JUnit @Test annotations
Google Truth assertion library
Direct instance testing of LintRegistry

Technical Details

Testing tools and configuration:

JUnit 4 testing framework
Google Truth assertion library
Custom LintRegistry implementation
InvalidR2UsageDetector integration
Android Lint API implementation

Best Practices Demonstrated

The test suite exemplifies several testing best practices, including single responsibility principle and clear assertion structure. Notable practices include:

Focused test scope
Clear naming conventions
Efficient test setup
Use of modern assertion library
Minimal test overhead

jakewharton/butterknife

butterknife-lint/src/test/java/butterknife/lint/LintRegistryTest.java

            
package butterknife.lint;

import org.junit.Test;

import static com.google.common.truth.Truth.assertThat;

public final class LintRegistryTest {
  @Test public void issues() {
    assertThat(new LintRegistry().getIssues()).contains(InvalidR2UsageDetector.ISSUE);
  }
}