[test-improver] Improve tests for server shutdown

[github-actions]

Test Improvements: shutdown_test.go

File Analyzed

• Test File: internal/server/shutdown_test.go
• Package: internal/server

Improvements Made

1. Better Testify Assertions

Replaced manual if/else type-assertion blocks with idiomatic testify assertions:

Before:

if errorMsg, ok := response["error"].(string); ok {
    assert.Equal(t, tt.expectError, errorMsg, "Unexpected error message")
} else {
    t.Errorf("Expected error field in response")
}

After:

require.Contains(t, response, "error", "response should contain an 'error' field")
assert.Equal(t, tt.expectError, response["error"], "Unexpected error message")

• ✅ require.Contains now fails fast with a clear message if "error" key is missing
• ✅ assert.Equal directly compares the value without the awkward type assertion
• ✅ Eliminates use of t.Errorf in favour of testify's consistent assertion API

2. Parallel Test Execution

• ✅ Added t.Parallel() to TestShutdownBehavior_RoutedMode and TestShutdownBehavior_UnifiedMode
  These tests are self-contained and create their own server/handler per subtest, so they are safe to run in parallel.

Test Execution

All tests pass:

--- PASS: TestShutdownBehavior_RoutedMode (0.01s)
    --- PASS: TestShutdownBehavior_RoutedMode/MCP_endpoint_rejected_with_503_after_shutdown
    --- PASS: TestShutdownBehavior_RoutedMode/MCP_endpoint_with_trailing_slash_rejected_with_503
    --- PASS: TestShutdownBehavior_RoutedMode/Health_endpoint_still_works_during_shutdown
    --- PASS: TestShutdownBehavior_RoutedMode/Close_endpoint_returns_410_on_subsequent_calls
PASS
ok  github.com/github/gh-aw-mcpg/internal/server  0.021s

Why These Changes?

The shutdown_test.go file was using raw t.Errorf in a few places where testify's require.Contains + assert.Equal provides clearer failure messages and better integrates with the rest of the testify-based test suite. The t.Parallel() additions allow the test runner to execute these independent table-driven tests concurrently, reducing total test time.

---

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Focuses on better patterns, increased coverage, and more stable tests

Generated by Test Improver · ● 4.6M · ◷

[Copilot]

Pull request overview

This PR refines the shutdown behavior tests in internal/server by improving assertion patterns and attempting to speed up execution via parallelism.

Changes:

• Adds t.Parallel() to the routed and unified shutdown behavior tests.
• Replaces manual JSON field/type checks with require.Contains + assert.Equal for clearer failures.

Show a summary per file

File	Description
internal/server/shutdown_test.go	Updates shutdown tests with improved testify assertions and enables parallel execution for two top-level test functions.

Copilot's findings

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Comments suppressed due to low confidence (1)

internal/server/shutdown_test.go:113

• Adding t.Parallel() here can make this test run concurrently with other shutdown tests, and /close ultimately calls guard.CloseGlobalCompilationCache() (documented as not safe to call concurrently). This can introduce flakiness/undefined behavior; consider removing t.Parallel() for this test or making the shutdown path avoid/serialize the global cache close in tests.

	t.Parallel()

• Files reviewed: 1/1 changed files
• Comments generated: 1