How Can I Add Colorful Output to Go Test Runs?

Colorizing Go Test Run Output with grc

In the realm of software testing, clear and concise output is crucial. By default, Go's testing package provides minimal colorization, limiting the feedback to text-only output. However, there is a solution to enhance the visual appeal of test runs using a tool called grc.

grc (generic colourizer) is a versatile tool that allows you to colorize any terminal output. To utilize grc for Go test run colorization, follow these steps:

1. Installation:
On Debian/Ubuntu: apt-get install grc
On Mac with Homebrew: brew install grc

2. Configuration:

• Create a config directory: mkdir ~/.grc
• Configure grc: mkdir ~/.grc/grc.conf

# Go
^([/\w\.]+\/)?go test\b
conf.gotest

• Create a test colorization config: mkdir ~/.grc/conf.gotest

# go-test grc colorizer configuration
regexp==== RUN .*
colour=bright_blue
-
regexp=--- PASS: .* (\(\d+\.\d+s\))
colour=green, yellow
-
regexp=^PASS$
colour=bold white on_green
-
regexp=^(ok|FAIL)\s+.*
colour=default, magenta
-
regexp=--- FAIL: .* (\(\d+\.\d+s\))
colour=red, yellow
-
regexp=^FAIL$
colour=bold white on_red
-
regexp=[^\s]+\.go(:\d+)?
colour=cyan

3. Execution:

• Run Go tests with colorization: grc go test -v ./..

Enhanced User Experience:
grc provides a visually appealing test output, as seen in the screenshot:

[Image of colorized Go test run output]

To simplify the execution process, create an alias in your shell:

alias go=grc go

Now, you can colorize Go test outputs effortlessly by running:

go test -v ./..

By integrating grc into your testing workflow, you can gain a better visualization of your test results, enabling you to identify failures and successes more quickly.

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