Learn Go with Pocket-Sized Projects MEAP V01 by copyright-2022-manning-publications.html

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Listing 3.13 test helper implementation

// testWriter is a struct that implements io.Writer. // We use it to validate that we can write to a specific output. type testWriter struct { contents string } // Write implements the io.Writer interface. func (tw *testWriter) Write(p []byte) (n int, err error) { #A tw.contents = tw.contents + string(p) #B return len(p), nil }

This structure can be passed to the functional option higher in our test. At the end of the test, we can then check that the writer’s contents are what we expect.

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