container/stub: override goexit methods

FailNow, Fatal, Fatalf, SkipNow, Skip and Skipf must be called from the goroutine created by the test.

Signed-off-by: Ophestra <cat@gensokyo.uk>

container/stub/exit_test.go

@@ -2,18 +2,67 @@ package stub_test
 
 import (
 	"testing"
+	_ "unsafe"
 
 	"hakurei.app/container/stub"
 )
 
+//go:linkname handleExit hakurei.app/container/stub.handleExit
+func handleExit(_ testing.TB, _ bool)
+
+// overrideTFailNow overrides the Fail and FailNow method.
+type overrideTFailNow struct {
+	*testing.T
+	failNow bool
+	fail    bool
+}
+
+func (o *overrideTFailNow) FailNow() {
+	if o.failNow {
+		o.Errorf("attempted to FailNow twice")
+	}
+	o.failNow = true
+}
+
+func (o *overrideTFailNow) Fail() {
+	if o.fail {
+		o.Errorf("attempted to Fail twice")
+	}
+	o.fail = true
+}
+
 func TestHandleExit(t *testing.T) {
 	t.Run("exit", func(t *testing.T) {
-		defer stub.HandleExit()
+		defer handleExit(t, true)
 		panic(stub.PanicExit)
 	})
 
+	t.Run("goexit", func(t *testing.T) {
+		t.Run("FailNow", func(t *testing.T) {
+			ot := &overrideTFailNow{T: t}
+			defer func() {
+				if !ot.failNow {
+					t.Errorf("FailNow was never called")
+				}
+			}()
+			defer handleExit(ot, true)
+			panic(0xcafe0000)
+		})
+
+		t.Run("Fail", func(t *testing.T) {
+			ot := &overrideTFailNow{T: t}
+			defer func() {
+				if !ot.fail {
+					t.Errorf("Fail was never called")
+				}
+			}()
+			defer handleExit(ot, false)
+			panic(0xcafe0000)
+		})
+	})
+
 	t.Run("nil", func(t *testing.T) {
-		defer stub.HandleExit()
+		defer handleExit(t, true)
 	})
 
 	t.Run("passthrough", func(t *testing.T) {
@@ -24,7 +73,7 @@ func TestHandleExit(t *testing.T) {
 			}
 
 		}()
-		defer stub.HandleExit()
+		defer handleExit(t, true)
 		panic(0xcafebabe)
 	})
 }