Fix tests

Author: sakthivelmanii

.github/workflows/ci.yaml

@@ -114,7 +114,7 @@ jobs:
           GOOGLE_CLOUD_SPANNER_MULTIPLEXED_SESSIONS_FOR_RW: true
   units-with-regular-session8:
     # Building using Java 17 and run the tests with Java 8 runtime
-    name: "units-with-multiplexed-session (8)"
+    name: "units-with-regular-session (8)"
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4

google-cloud-spanner/src/test/java/com/google/cloud/spanner/RetryOnDifferentGrpcChannelMockServerTest.java

@@ -313,6 +313,7 @@ public void testSingleUseQuery_retriesOnNewChannel() {
 
   @Test
   public void testSingleUseQuery_stopsRetrying() {
+    assumeFalse(TestHelper.isMultiplexSessionDisabled());
     SpannerOptions.Builder builder = createSpannerOptionsBuilder();
     builder.setSessionPoolOption(
         SessionPoolOptions.newBuilder().setUseMultiplexedSession(true).build());