Improve error handling and assertions in compose up test

Author: 4RH1T3CT0R7

pkg/e2e/up_test.go

@@ -94,10 +94,13 @@ func TestUpDependenciesNotStopped(t *testing.T) {
 	err = cmd.Wait()
 	if err != nil {
 		var exitErr *exec.ExitError
-		errors.As(err, &exitErr)
-		// Process is expected to die from re-raised SIGINT signal
+		if !errors.As(err, &exitErr) {
+			t.Fatalf("`compose up` failed with non-exit error: %v", err)
+		}
+		// Process is expected to die from re-raised SIGINT signal (exit code -1).
+		// If signal re-raise doesn't terminate the process, the fallback path exits with code 130.
 		assert.Assert(t, exitErr.ExitCode() == -1 || exitErr.ExitCode() == 130,
-			"`compose up` exited with unexpected code: %v", err)
+			"`compose up` exited with unexpected code: %d (%v)", exitErr.ExitCode(), err)
 	}
 
 	RequireServiceState(t, c, "app", "exited")