testlib/stack_test.go at master · gigawattio/testlib · GitHub

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package testlib

import (
	"fmt"
	"regexp"
	"strings"
	"testing"

	log "github.com/sirupsen/logrus"
)

var initErr error

// init is tested here as an anti-pattern.
func init() {
	defer func() {
		if r := recover(); r != nil {
			recoveredMessage := fmt.Sprintf("%s", r)
			if !strings.HasPrefix(recoveredMessage, "CurrentRunningTest() failed") {
				initErr = fmt.Errorf("`CurrentRunningTest()' function is broken, the panic message didn't match the expected format, broken message=%s", recoveredMessage)
			} else {
				log.Info("Successfully recovered from panic generated by invoking `CurrentRunningTest()' from inside `init()' function")
			}
		} else {
			initErr = fmt.Errorf("`CurrentRunningTest()' function is broken, I expected to recover from a panic, but `recover()' yielded nil")
		}
	}()
	log.Infof("If you see this message, watch out! The test is going to fail! `CurrentRunningTest()'=%s", CurrentRunningTest())
}

// requireCleanInit checks the result of `init` to ensure it has behaved as
// expected.
func requireCleanInit(t *testing.T) {
	if initErr != nil {
		t.Errorf("`init()' left an unexpected error behind: %s", initErr)
	}
}

func verifyRunningTestName(t *testing.T, testName string) {
	requireCleanInit(t) // Placed here to ensure the check is executed at some point in this test suite.
	if reportedName := CurrentRunningTest(); reportedName != testName {
		t.Errorf(`CurrentRunningTest() should have produced "%s" but instead gave "%s"`, testName, reportedName)
	}
}

func Test_CurrentRunningTest(t *testing.T) {
	testName := "Test_CurrentRunningTest"
	verifyRunningTestName(t, testName)
}

func TestNoUnderScoreJustLetters(t *testing.T) {
	testName := "TestNoUnderScoreJustLetters"
	verifyRunningTestName(t, testName)
}

func Test0IsTheNumberZer0(t *testing.T) {
	testName := "Test0IsTheNumberZer0"
	verifyRunningTestName(t, testName)
}

func TestExpr2(t *testing.T) {
	st := []byte(`goroutine 1 [running, locked to thread]:
gigawatt-server/pkg/testlib.Stack(0x0, 0x0, 0x0)
	/Users/jay/go/src/gigawatt-server/pkg/testlib/stack.go:24 +0xa5
gigawatt-server/pkg/testlib.IsRunningTests(0x6320e)
	/Users/jay/go/src/gigawatt-server/pkg/testlib/stack.go:70 +0x27
gigawatt-server/config.validate()
	/Users/jay/go/src/gigawatt-server/config/config.go:165 +0x1e4
gigawatt-server/config.init·1()
	/Users/jay/go/src/gigawatt-server/config/config.go:142 +0xa28
gigawatt-server/config.init()
	/Users/jay/go/src/gigawatt-server/config/resource_acquisition.go:1 +0x136
gigawatt-server/pkg/kafka.init()
	/Users/jay/go/src/gigawatt-server/pkg/kafka/kafka_test.go:69 +0x42
main.init()
	gigawatt-server/pkg/kafka/_test/_testmain.go:56 +0x4a`)

	if !regexp.MustCompile(testExpr2).Match(st) {
		t.Errorf("testExpr2 didn't match stack;\n\ntestExpr2=%s\n\nstack=%s", testExpr2, string(st))
	}
}