Testify
The most popular Go testing toolkit. Provides assertion helpers (assert package), mock generation (mock package), and test suite support (suite package). assert.Equal(t, expected, actual) gives readable failure messages instead of Go's default verbose if expected != actual pattern. mock.Mock enables interface mocking without code generation. The de-facto standard testing addition for Go.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
MIT licensed. Test-only library — no production deployment. No security concerns.
⚡ Reliability
Best When
You want readable, expressive assertions and mocking in Go tests without the boilerplate of pure Go testing — the most common Go testing pattern.
Avoid When
You prefer the stdlib-only approach for minimal dependencies, or you're writing benchmarks where testify's overhead matters.
Use Cases
- • Write readable agent unit tests with clear assertion failures: assert.Equal(t, 'active', agent.Status)
- • Create mock objects for agent interface dependencies without code generation in Go tests
- • Organize related agent tests in suites with setup/teardown via testify's suite package
- • Use require.NoError(t, err) to fail fast on critical errors vs assert which continues test execution
- • Test complex agent data structures with assert.JSONEq(), assert.ElementsMatch(), assert.Eventually()
Not For
- • Behavioral testing (BDD) — use GoConvey or Ginkgo for BDD-style Go tests
- • Benchmark testing — Go's built-in testing.B is sufficient for benchmarks without testify
- • Performance-critical tests where testify's reflection overhead matters
Interface
Authentication
Local testing library — no authentication required. MIT licensed.
Pricing
MIT licensed. Zero cost.
Agent Metadata
Known Gotchas
- ⚠ assert vs require: assert.Equal(t, ...) logs failure but continues; require.Equal(t, ...) calls t.FailNow() — use require when subsequent code depends on the assertion passing
- ⚠ mock.AssertExpectations(t) must be called at end of test to verify expected mock calls were made — forgetting this lets unused mocks pass silently
- ⚠ mock.Called(args...) in mock implementations records the call: func (m *MockAgent) Run(ctx context.Context) error { args := m.Called(ctx); return args.Error(0) }
- ⚠ assert.Eventually(t, func() bool { ... }, timeout, interval) for async testing — polls the condition function; useful for testing agent background operations
- ⚠ Struct comparison: assert.Equal uses reflect.DeepEqual — unexported fields are included; use assert.EqualValues for interface comparison or assert.ObjectsAreEqualValues
- ⚠ Suite: embed testify/suite.Suite and implement SetupTest/TearDownTest for per-test setup; run with suite.Run(t, new(AgentSuite))
Alternatives
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Scores are editorial opinions as of 2026-03-06.