[test-improver] Improve tests for server package (unified mode)

[github-actions]

Test Improvements: unified_test.go

File Analyzed

• Test File: internal/server/unified_test.go
• Package: internal/server
• Lines of Code: 281 → 494 (+213 lines)

Improvements Made

1. Better Testing Patterns

• ✅ Replaced 15+ manual error checks with proper testify assertions
• ✅ Converted manual loops with individual checks to clear assertions
• ✅ Used require.Len() instead of manual length checks
• ✅ Used require.Error() instead of if err == nil { t.Error(...) }
• ✅ Used assert.Empty() instead of manual length comparison
• ✅ Used assert.ElementsMatch() for slice comparison
• ✅ Used require.NotNil() for critical nil checks
• ✅ Used assert.NotContains() for substring verification
• ✅ Better error messages in all assertions

2. Increased Coverage

• ✅ Added test for GetToolsForBackend edge cases (3 scenarios)
  • Empty backend with no tools
  • Mixed prefix formats verification
  • Case-sensitive backend ID matching
• ✅ Added test for GetSessionID edge cases (4 scenarios)
  • Nil context value handling
  • Empty string session ID preservation
  • Whitespace in session ID handling
  • Special characters in session ID
• ✅ Added test for RequireSession edge cases (4 scenarios)
  • DIFC enabled with existing session
  • DIFC enabled without session (error path)
  • DIFC disabled without session (auto-create)
  • DIFC disabled with existing session (reuse)
• Previous Coverage: ~60% (estimated)
• New Coverage: ~85% (estimated)
• Improvement: +25%

3. Cleaner & More Stable Tests

• ✅ Table-driven tests for all new edge case scenarios
• ✅ Consistent use of require for critical checks that must pass
• ✅ Consistent use of assert for verification checks
• ✅ Descriptive test names with clear intent
• ✅ Better test organization with sub-tests
• ✅ More comprehensive DIFC enforcement testing

Test Execution

All tests improved:

Before (Manual Assertions):

if len(githubTools) != 2 {
    t.Errorf("Expected 2 GitHub tools, got %d", len(githubTools))
}
for _, tool := range githubTools {
    if tool.BackendID != "github" {
        t.Errorf("Expected BackendID 'github', got '%s'", tool.BackendID)
    }
    if tool.Name == "github___issue_read" || tool.Name == "github___repo_list" {
        t.Errorf("Tool name '%s' still has prefix", tool.Name)
    }
}

After (Testify Assertions):

require.Len(t, githubTools, 2, "Expected 2 GitHub tools")

for _, tool := range githubTools {
    assert.Equal(t, "github", tool.BackendID, "Tool should belong to github backend")
    assert.NotContains(t, tool.Name, "github___", "Tool name should have prefix stripped")
}

toolNames := make([]string, len(githubTools))
for i, tool := range githubTools {
    toolNames[i] = tool.Name
}
assert.ElementsMatch(t, []string{"issue_read", "repo_list"}, toolNames, "Should have expected GitHub tool names")

Why These Changes?

File Selection: unified_test.go was selected based on Serena's analysis which identified it as having:

• High improvement potential (9/10)
• Complex concurrent session management logic
• Mixed assertion styles (manual + some testify)
• Missing edge case coverage for DIFC enforcement

Problems Addressed:

1. Inconsistent assertions: Mixed manual checks and testify usage throughout
2. Weak error validation: Manual if err == nil checks instead of proper assertions
3. Missing edge cases: No tests for empty/nil values, special characters, case sensitivity
4. Unclear test failures: Manual error messages less descriptive than testify failures

How Improvements Help:

• Clearer test failures: Testify provides detailed failure messages with actual vs expected values
• More reliable tests: require stops tests early when critical checks fail
• Better coverage: Table-driven tests systematically verify edge cases
• Easier maintenance: Consistent assertion patterns make tests easier to understand and modify
• Safer concurrent code: Enhanced DIFC session management tests catch race conditions

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