unit test for change in existing pattern

Author: sagnghos

google-cloud-spanner/src/test/java/com/google/cloud/spanner/connection/ConnectionOptionsTest.java

@@ -1253,4 +1253,21 @@ public void testExternalHostPatterns() {
     assertNull(matcherWithPrefixSpanner.group("INSTANCEGROUP"));
     assertEquals("test-db", matcherWithPrefixSpanner.group("DATABASEGROUP"));
   }
+
+  @Test
+  public void testBuildWithValidURIWithPrefixSpanner() {
+    ConnectionOptions.Builder builder = ConnectionOptions.newBuilder();
+    builder.setUri(
+        "spanner:/projects/test-project-123/instances/test-instance-123/databases/test-database-123?autocommit=false;readonly=true");
+    builder.setCredentialsUrl(FILE_TEST_PATH);
+    ConnectionOptions options = builder.build();
+    assertThat(options.getHost()).isEqualTo(DEFAULT_HOST);
+    assertThat(options.getProjectId()).isEqualTo("test-project-123");
+    assertThat(options.getInstanceId()).isEqualTo("test-instance-123");
+    assertThat(options.getDatabaseName()).isEqualTo("test-database-123");
+    assertThat(options.getCredentials())
+        .isEqualTo(new CredentialsService().createCredentials(FILE_TEST_PATH));
+    assertThat(options.isAutocommit()).isEqualTo(false);
+    assertThat(options.isReadOnly()).isEqualTo(true);
+  }
 }