godfreyhe commented on a change in pull request #12431:
URL: https://github.com/apache/flink/pull/12431#discussion_r434317689



##########
File path: 
flink-table/flink-sql-client/src/test/java/org/apache/flink/table/client/cli/CliClientTest.java
##########
@@ -166,6 +167,64 @@ public void write(int b) throws IOException {
                }
        }
 
+       @Test
+       public void testUseCatalog() throws Exception {
+               TestingExecutor executor = new TestingExecutorBuilder()
+                               .setUseCatalogConsumer((ignored1, catalogName) 
-> {
+                                       if (!catalogName.equals("cat")) {
+                                               throw new 
SqlExecutionException("unexpected catalog name: " + catalogName);
+                                       }
+                               })
+                               .build();
+
+               InputStream inputStream = new ByteArrayInputStream("use catalog 
cat;\n".getBytes());
+               ByteArrayOutputStream outputStream = new 
ByteArrayOutputStream(256);
+               CliClient cliClient = null;
+               SessionContext sessionContext = new 
SessionContext("test-session", new Environment());
+               String sessionId = executor.openSession(sessionContext);
+
+               try (Terminal terminal = new DumbTerminal(inputStream, 
outputStream)) {

Review comment:
       `CliClient` does not inherit from `AutoCloseable`, so we can put 
`CliClient` into `try-with-resource` block




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