Synchronize deadline regression with source inspection

build_source_cancellation_test.go

@@ -14,6 +14,14 @@ import (
 	releasekit "go.maximumdirect.net/releasekit"
 )
 
+// inspectionDeadlineContext models deadline expiration at the readiness signal,
+// so unrelated setup time cannot consume the source-inspection test's deadline.
+type inspectionDeadlineContext struct{ context.Context }
+
+func (ctx inspectionDeadlineContext) Err() error {
+	return context.Cause(ctx.Context)
+}
+
 func TestBuildSourceInspectionCancellation(t *testing.T) {
 	const source = `package main
 import("fmt";"os";"go.maximumdirect.net/releasekit/buildinfo")
@@ -58,7 +66,9 @@ exec "$INSPECT_GIT" "$@"
 			var ctx context.Context
 			var cancel context.CancelFunc
 			if tc.deadline {
-				ctx, cancel = context.WithTimeout(context.Background(), 3*time.Second)
+				parent, expire := context.WithCancelCause(context.Background())
+				ctx = inspectionDeadlineContext{parent}
+				cancel = func() { expire(context.DeadlineExceeded) }
 			} else {
 				ctx, cancel = context.WithCancel(context.Background())
 			}
@@ -93,10 +103,13 @@ exec "$INSPECT_GIT" "$@"
 				case <-ticker.C:
 				}
 			}
-			if !tc.deadline {
-				cancel()
+			cancel()
+			var result outcome
+			select {
+			case result = <-done:
+			case <-timer.C:
+				t.Fatal("build did not stop after source inspection interruption")
 			}
-			result := <-done
 			want := context.Canceled
 			if tc.deadline {
 				want = context.DeadlineExceeded