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docs: reference formula assertions for tests

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Sean Molenaar 2020-06-25 11:06:22 +02:00 committed by Sean Molenaar
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docs/Formula-Cookbook.md
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@ -261,7 +261,7 @@ We want tests that don't require any user input and test the basic functionality
See [`cmake`](https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/cmake.rb) for an example of a formula with a good test. The formula writes a basic `CMakeLists.txt` file into the test directory then calls CMake to generate Makefiles. This test checks that CMake doesn't e.g. segfault during basic operation.
You can check that the output is as expected with `assert_equal` or `assert_match` on the output of shell_output such as in this example from the [envv formula](https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/envv.rb):
You can check that the output is as expected with `assert_equal` or `assert_match` on the output of the [Formula assertions](https://rubydoc.brew.sh/Homebrew/Assertions.html) such as in this example from the [envv formula](https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/envv.rb):
```ruby
assert_equal "mylist=A:C; export mylist", shell_output("#{bin}/envv del mylist B").strip