How Can I Colorize My Go Test Run Output with grc?

Colorizing Go Test Run Output with grc

Testing is a crucial aspect of software development, and visualizing test outcomes can significantly enhance the feedback experience. While many Go testing libraries offer output colorization, this article demonstrates how to use grc, a generic colorizing tool, to add this functionality to the default testing package that comes with Go.

grc is a versatile tool that can be configured to colorize any type of output based on user-defined rules. To enable it for Go test output, follow these steps:

1. Install grc:

   • On Debian/Ubuntu: apt-get install grc
   • On Mac with Homebrew: brew install grc
2. Create grc's configuration directory: mkdir ~/.grc
3. Create a Go test configuration file: ~/.grc/conf.gotest
4. Define colorization rules in the configuration file: Customize the color settings for different types of test outcomes, such as PASS, FAIL, and RUN.
5. Run Go tests with grc: grc go test -v ./..

To streamline the usage, you can add an alias in your shell by adding the following line to your .bashrc or .bash_profile:

alias go=grc go

Now, you can simply run go test -v ./.. to get the colorized test output.

The attached screenshot demonstrates the colorized output, where PASS results are displayed in green on a yellow background, and FAIL results are shown in red on a white background.

Using grc, you can easily customize the colorization rules to suit your preferences, enhancing the feedback process and making it easier to identify passing and failing tests at a glance.

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