CODEWITHSUNDEEP
javaamazon-web-servicesamazon-s3mockito
aqsa93
aqsa93

Reputation: 101

How to mock AWS API using Mockito in java

I need help to mock AWS APIs using Mockito in Java. As I have tried to mock RDS connection but connection returns null statement object. I have to mock S3, AWS Data pipeline, JavaSaprkContext, RDS connection, Lambda, SNS and DynamoDB.

Here is my code for RDS Connection, that returns null statement object:

public void testGetRDSConnection() throws SQLException{
    Connection connection = mock(Connection.class);
    Statement stmt = null;
    stmt = connection.createStatement(); // Get NULL statement Object
    ResultSet rs = stmt.executeQuery("SELECT * FROM table");
    if (rs.next()) {
        System.out.println("+ve Test is PASSED Name = testGetRDSConnection ");
    } else {
        System.out.println("+ve Test is FAILED Name= testGetRDSConnection ");
    }

}

and test case for S3, that return null metadata object:

 public void testGetObjectMetadata(){
    ObjectMetadata obj = S3Util.getObjectMetadata(mock(AmazonS3Client.class), bucketName, filePath);
    if (obj == null) {
        System.out.println("+ve Test is FAILED Name= 'testGetObjectMetadata()' No metadata found");
        fail("+ve Test is FAILED Name= 'testGetObjectMetadata()' No metadata found");

    } else if (obj != null) {
        System.out.println("+ve Test is FAILED Name= 'testGetObjectMetadata()'");

    }
}

Upvotes: 10

Views: 24025

Answers (3)

madhead
madhead

Reputation: 33511

In addition to whummer's and shachar's answers:

If you're a lucky JUnit 5 user, let me recommend you JUnit 5 extensions for AWS*, a few JUnit 5 extensions that could be useful for testing AWS-related code. These extensions can be used to inject clients for AWS service clients provided by tools like localstack (or the real ones). Both AWS Java SDK v 2.x and v 1.x are supported.

*I maintain this library

Upvotes: 6

whummer
whummer

Reputation: 497

There are some pretty sophisticated Cloud service mocking frameworks out there, for instance moto has a mock implementation whose functionality is very similar to the actual S3 API.

You could also take a look at LocalStack, a framework which combines existing tools and provides a fully functional local cloud environment that can be used for integration testing.

Although some of these tools are written in other languages (Python, Node.js), it should be easy to spin up the test environment in an external process from your Java test class.

Upvotes: 4

shachar
shachar

Reputation: 639

Never mock APIs/types that you don't know how they behave. A better solution will be to add your own API that one of its implementation will be AWS. Then you be able to mock your own API

Upvotes: 3

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