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Showing content from https://docs.aws.amazon.com/sdkforruby/api/Aws/ClientStubs.html below:

ClientStubs — AWS SDK for Ruby V2

This method returns an undefined value.

Configures what data / errors should be returned from the named operation when response stubbing is enabled.

When you enable response stubbing, the client will generate fake responses and will not make any HTTP requests.

client = Aws::S3::Client.new(stub_responses: true)
client.list_buckets

You can provide stub data that will be returned by the client.

client = Aws::S3::Client.new(stub_responses: {
  list_buckets: { buckets: [{name: 'my-bucket' }] },
  get_object: { body: 'data' },
})

client.list_buckets.buckets.map(&:name) client.get_object(bucket:'name', key:'key').body.read 

You can also specify the stub data using #stub_responses

client = Aws::S3::Client.new(stub_responses: true)
client.stub_responses(:list_buckets, {
  buckets: [{ name: 'my-bucket' }]
})

client.list_buckets.buckets.map(&:name)

With a Resource class #stub_responses on the corresponding client:

s3 = Aws::S3::Resource.new(stub_responses: true)
s3.client.stub_responses(:list_buckets, {
  buckets: [{ name: 'my-bucket' }]
})

s3.buckets.map(&:name)

Lastly, default stubs can be configured via Aws.config:

Aws.config[:s3] = {
  stub_responses: {
    list_buckets: { buckets: [{name: 'my-bucket' }] }
  }
}

Aws::S3::Client.new.list_buckets.buckets.map(&:name)

Aws::S3::Resource.new.buckets.map(&:name)

In addition to creating static stubs, it's also possible to generate stubs dynamically based on the parameters with which operations were called, by passing a Proc object:

s3 = Aws::S3::Resource.new(stub_responses: true)
s3.client.stub_responses(:put_object, -> (context) {
  s3.client.stub_responses(:get_object, content_type: context.params[:content_type])
})

The yielded object is an instance of Seahorse::Client::RequestContext.

When stubbing is enabled, the SDK will default to generate fake responses with placeholder values. You can override the data returned. You can also specify errors it should raise.

client.stub_responses(:get_object, 'NotFound')
client.get_object(bucket:'aws-sdk', key:'foo')

client.stub_responses(:get_object, Timeout::Error)
client.get_object(bucket:'aws-sdk', key:'foo')

client.stub_responses(:get_object, RuntimeError.new('custom message'))
client.get_object(bucket:'aws-sdk', key:'foo')

As an alternative to providing the response data, you can provide an HTTP response.

client.stub_responses(:get_object, {
  status_code: 200,
  headers: { 'header-name' => 'header-value' },
  body: "...",
})

To stub a HTTP response, pass a Hash with all three of the following keys set:

• :status_code - - The HTTP status code
• :headers - Hash<String,String> - A hash of HTTP header keys and values
• :body - <String,IO> - The HTTP response body.

Calling an operation multiple times will return similar responses. You can configure multiple stubs and they will be returned in sequence.

client.stub_responses(:head_object, [
  'NotFound',
  { content_length: 150 },
])

client.head_object(bucket:'aws-sdk', key:'foo')

resp = client.head_object(bucket:'aws-sdk', key:'foo')
resp.content_length 

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