How to avoid Flaky tests in Golang? Use go test -test.short to ignore tests marked as Flaky. Properly start and shut down servers/services required for testing. Use concurrency control mechanisms to prevent race conditions. Seed the random number generator to eliminate randomness. Use the Cleanup method and defer keyword to ensure resource cleanup. Use mocking and stubbing to avoid environment dependencies. Capture Flaky behavior with table-driven testing. Move the service into the test suite's Setup() method to avoid race conditions.
Flaky testing refers to test cases with inconsistent or unpredictable test results. This is a serious problem for code stability and maintainability.
In Golang, there are several common reasons for Flaky testing:
Here are some tips to avoid Flaky tests:
[Slow]
, [Serial]
, and [Flaky]
are ignored at runtime. sync.Mutex
or other concurrency control mechanisms: Prevent race conditions. Cleanup
method of *testing.T
: Define cleanup code that runs at the end of the test to ensure that the test is set up correctly . defer
keyword: avoid resource leaks and ensure resources are released when a test fails. Consider the following example test:
import "testing" func TestSomething(t *testing.T) { service := StartService() defer service.Close() // ... 测试逻辑 }
This test is vulnerable to Flaky because StartService()
may A race condition occurs in parallel testing. To avoid this, you can move the service into the test suite's Setup()
method:
func TestSomething(t *testing.T) { setupTestSuite(t) // ... 测试逻辑 } func setupTestSuite(t *testing.T) { t.Helper() service = StartService() t.Cleanup(func() { service.Close() }) }
With this approach, the service is started at the beginning of the test suite, and is Close at the end of the suite, thus avoiding race conditions.
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