cupaloy
gomega
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cupaloy
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Comprehensive Guide to Testing in Go
This article leaves out snapshot testing. It’s not really relevant in a backend application, but I find it very useful in user or customer facing CLIs to ensure you don’t incidentally change command output or formatting. bradleyjkemp/cupaloy has served me pretty well.
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Snapshot testing in Golang
Go Snaps used Jest Snapshoting and Cupaloy as inspiration.
gomega
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Writing tests for a Kubernetes Operator
Gomega: is a test assertion library, a vital dependency on Ginkgo.
- Quick tip: Easy test assertions with Go generics
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Learning Go by examples: part 6 - Create a gRPC app in Go
Gomega is a Go library that allows you to make assertions. In our example, we check if what we got is null, not null, or equal to an exact value, but the gomega library is much richer than that.
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Tips to prevent adoption of your API
Depends on the API and how much testing you need. You want to test your code, not the API's availability or correctness.
But it can be as easy as using a fake http library and mocking the responses, or using a httptest server: https://onsi.github.io/gomega/#ghttp-testing-http-clients
If the API is complicated and you have to write your own fake server, that might not make sense for small projects.
- fluentassert - a prototype of yet another assertion library
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Go generics beyond the playground
If we do the count, we gather that subtest appear to solve five out of the six problems we identified with the assert library. At this point though, it's important to note that at the time when the assert package was designed, the sub-test feature in Go did not yet exist. Therefore it would have been impossible for that library to embed it into it's design. This is also true for when Gomega and Ginko where designed. If these test frameworks where created now, then most likely some parts of their design would have been done differently. What I am trying to say is that with even the slightest change in the Go language and standard library, completely new ways of designing programs become possible. Especially for new packages without any legacy use-cases to consider. And this brings us to generics.
What are some alternatives?
assert - :exclamation:Basic Assertion Library used along side native go testing, with building blocks for custom assertions
Testify - A toolkit with common assertions and mocks that plays nicely with the standard library
endly - End to end functional test and automation framework
GoConvey - Go testing in the browser. Integrates with `go test`. Write behavioral tests in Go.
gogiven - gogiven - BDD testing framework for go that generates readable output directly from source code
godog - Cucumber for golang
Hamcrest - Hamcrest matchers for the Go programming language
goblin - Minimal and Beautiful Go testing framework
go-mutesting - Mutation testing for Go source code
gocheck - Rich testing for the Go language