Add test to check that all settings frames are acked
diff --git a/tools/http2_interop/s6.5_test.go b/tools/http2_interop/s6.5_test.go
index 9dadd4e..063fd56 100644
--- a/tools/http2_interop/s6.5_test.go
+++ b/tools/http2_interop/s6.5_test.go
@@ -13,3 +13,14 @@
 	err := testSmallMaxFrameSize(ctx)
 	matchError(t, err, "Got goaway frame")
 }
+
+func TestSoonAllSettingsFramesAcked(t *testing.T) {
+	defer Report(t)
+	if *testCase != "framing" {
+		t.SkipNow()
+	}
+	ctx := InteropCtx(t)
+	if err := testAllSettingsFramesAcked(ctx); err != nil {
+		t.Fatal(err)
+	}
+}