test: fix test fallout from notify push

p2p/host/basic/basic_host_test.go

@@ -209,6 +209,8 @@ func TestHostProtoPreference(t *testing.T) {
 		t.Fatal(err)
 	}
 
+	// XXX: This is racy now that we push protocol updates. If this tests
+	// fails, try allowing both protoOld and protoMinor.
 	assertWait(t, connectedOn, protoOld)
 
 	s2.Close()
@@ -218,6 +220,12 @@ func TestHostProtoPreference(t *testing.T) {
 		t.Fatal(err)
 	}
 
+	// Force a lazy handshake as we may have received a protocol update by this point.
+	_, err = s3.Write([]byte("hello"))
+	if err != nil {
+		t.Fatal(err)
+	}
+
 	assertWait(t, connectedOn, protoMinor)
 	s3.Close()
 }