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Merge pull request #4655 from justinsb/cloudmock_docs
Add README to say what cloudmock is
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cloudmock is a mock implementation of the AWS APIs.
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The goal is to let us test code that interacts with the AWS APIs, without creating actual AWS resources.
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While no resources are created, we maintain state so that (for example) after you call `CreateVpc`, a subsequent
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call to `DescribeVpcs` will return that VPC. The end-goal is that we simulate the AWS APIs accurately,
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so that we can quickly run test-cases that might otherwise require a lot of time or money to run with real
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AWS resources.
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In future, we can also do fault injection etc.
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Note: The AWS API is very large, and most of it is not implemented. Functions that are implemented may
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not be implemented correctly, particularly around edge-cases (such as error handling).
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Typical use: `c := &mockec2.MockEC2{}`. `MockEC2` implements the EC2 API interface `ec2iface.EC2API`,
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so can be used where otherwise you would use a real EC2 client.
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