tzulitai commented on a change in pull request #12944:
URL: https://github.com/apache/flink/pull/12944#discussion_r469030309



##########
File path: 
flink-connectors/flink-connector-kinesis/src/test/java/org/apache/flink/streaming/connectors/kinesis/util/AwsV2UtilTest.java
##########
@@ -0,0 +1,407 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.streaming.connectors.kinesis.util;
+
+import org.apache.flink.streaming.connectors.kinesis.config.AWSConfigConstants;
+import 
org.apache.flink.streaming.connectors.kinesis.config.ConsumerConfigConstants;
+
+import com.amazonaws.ClientConfiguration;
+import com.amazonaws.ClientConfigurationFactory;
+import org.junit.Test;
+import software.amazon.awssdk.auth.credentials.AwsCredentials;
+import software.amazon.awssdk.auth.credentials.AwsCredentialsProvider;
+import software.amazon.awssdk.auth.credentials.DefaultCredentialsProvider;
+import 
software.amazon.awssdk.auth.credentials.EnvironmentVariableCredentialsProvider;
+import software.amazon.awssdk.auth.credentials.ProfileCredentialsProvider;
+import 
software.amazon.awssdk.auth.credentials.SystemPropertyCredentialsProvider;
+import 
software.amazon.awssdk.auth.credentials.WebIdentityTokenFileCredentialsProvider;
+import software.amazon.awssdk.core.client.config.ClientOverrideConfiguration;
+import software.amazon.awssdk.core.client.config.SdkAdvancedClientOption;
+import software.amazon.awssdk.http.async.SdkAsyncHttpClient;
+import software.amazon.awssdk.http.nio.netty.NettyNioAsyncHttpClient;
+import software.amazon.awssdk.regions.Region;
+import software.amazon.awssdk.services.kinesis.KinesisAsyncClientBuilder;
+import 
software.amazon.awssdk.services.sts.auth.StsAssumeRoleCredentialsProvider;
+
+import java.net.URI;
+import java.nio.file.Paths;
+import java.time.Duration;
+import java.util.Properties;
+
+import static 
org.apache.flink.streaming.connectors.kinesis.config.AWSConfigConstants.AWS_CREDENTIALS_PROVIDER;
+import static 
org.apache.flink.streaming.connectors.kinesis.config.AWSConfigConstants.AWS_REGION;
+import static 
org.apache.flink.streaming.connectors.kinesis.config.AWSConfigConstants.roleArn;
+import static 
org.apache.flink.streaming.connectors.kinesis.config.AWSConfigConstants.roleSessionName;
+import static 
org.apache.flink.streaming.connectors.kinesis.config.AWSConfigConstants.webIdentityTokenFile;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyBoolean;
+import static org.mockito.ArgumentMatchers.anyInt;
+import static org.mockito.ArgumentMatchers.argThat;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+/**
+ * Tests for {@link AwsV2Util}.
+ */
+public class AwsV2UtilTest {
+
+       @Test
+       public void testGetCredentialsProviderEnvironmentVariables() {
+               Properties properties = properties(AWS_CREDENTIALS_PROVIDER, 
"ENV_VAR");
+
+               AwsCredentialsProvider credentialsProvider = 
AwsV2Util.getCredentialsProvider(properties);
+
+               assertTrue(credentialsProvider instanceof 
EnvironmentVariableCredentialsProvider);
+       }
+
+       @Test
+       public void testGetCredentialsProviderSystemProperties() {
+               Properties properties = properties(AWS_CREDENTIALS_PROVIDER, 
"SYS_PROP");
+
+               AwsCredentialsProvider credentialsProvider = 
AwsV2Util.getCredentialsProvider(properties);
+
+               assertTrue(credentialsProvider instanceof 
SystemPropertyCredentialsProvider);
+       }
+
+       @Test
+       public void 
testGetCredentialsProviderWebIdentityTokenFileCredentialsProvider() {
+               Properties properties = properties(AWS_CREDENTIALS_PROVIDER, 
"WEB_IDENTITY_TOKEN");
+
+               AwsCredentialsProvider credentialsProvider = 
AwsV2Util.getCredentialsProvider(properties);
+
+               assertTrue(credentialsProvider instanceof 
WebIdentityTokenFileCredentialsProvider);
+       }
+
+       @Test
+       public void testGetWebIdentityTokenFileCredentialsProvider() {
+               Properties properties = properties(AWS_CREDENTIALS_PROVIDER, 
"WEB_IDENTITY_TOKEN");
+               properties.setProperty(roleArn(AWS_CREDENTIALS_PROVIDER), 
"roleArn");
+               
properties.setProperty(roleSessionName(AWS_CREDENTIALS_PROVIDER), 
"roleSessionName");
+
+               WebIdentityTokenFileCredentialsProvider.Builder builder = 
mockWebIdentityTokenFileCredentialsProviderBuilder();

Review comment:
       Do these builders being tested against in these tests have a valid 
`equals` implementation?
   Or getter methods to obtain the configured values?
   
   I'm asking because if that's the case, then we can maybe remove the use of 
Mockito mocks in these tests by having `configure*Builder(builder, properties)` 
which are made package-private just for test visibility.
   In that case, these tests can be modified to just test against the 
`configure*Builder` methods which only just sets the config values on the 
builders.
   
   The verification in the test would then simply be an equals check / Matcher 
check:
   `assertThat(builderUnderTest, is(expectedBuilder))`.




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