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Rich-Go will enrich go test outputs with text decorations

PkgGoDev Go Report Card Coverage Status Release


NOTICE (what I think about richgo)

For some years, I've not been using richgo. Now I don't feel much effect that a little bit of tweaking to the appearance of the test output. And It is poor method that richgo parses and adjusts the standard output of go test. So now I recommend you that you do NOT use richgo, get use to pure go test, train an ability to find the error from the output and contribute to improve official go test if you needed. Some may think that I have too much faith in pure Go, but this is my honest feeling.


(go get):

go get -u


brew install kyoh86/tap/richgo


asdf plugin add richgo
asdf install richgo 0.3.6



richgo test ./...

In an existing pipeline

If your build scripts expect to interact with the standard output format of go test (for instance, if you're using go-junit-report), you'll need to use the testfilter subcommand of richgo.

For example:

go test ./... | tee >(richgo testfilter) | go-junit-report

This will "tee" the output of the standard go test run into a richgo testfilter process as well as passing the original output to go-junit-report.

Note that at some point this recommendation may change, as the "go test" tool may learn how to produce a standard output format golang/go#2981 that both this tool and others could rely on.


You can define alias so that go test prints rich outputs:

  • bash: ~/.bashrc
  • zsh: ~/.zshrc
alias go=richgo


Configuration file paths

It's possible to change styles with the preference file. Rich-Go loads preferences from the files in the following order.

  • ${CWD}/.richstyle
  • ${CWD}/.richstyle.yaml
  • ${CWD}/.richstyle.yml
  • ${GOPATH}/.richstyle
  • ${GOPATH}/.richstyle.yaml
  • ${GOPATH}/.richstyle.yml
  • ${GOROOT}/.richstyle
  • ${GOROOT}/.richstyle.yaml
  • ${GOROOT}/.richstyle.yml
  • ${HOME}/.richstyle
  • ${HOME}/.richstyle.yaml
  • ${HOME}/.richstyle.yml

Setting the environment variable RICHGO_LOCAL to 1, Rich-Go loads only ${CWD}/.richstyle*.

Configuration file format

Now Rich-Go supports only YAML formatted.

# Type of the label that notes a kind of each lines.
labelType: (long | short | none)

# Style of "Build" lines.
  # Hide lines
  hide: (true | false)
  # Bold or increased intensity.
  bold: (true | false)
  faint: (true | false)
  italic: (true | false)
  underline: (true | false)
  blinkSlow: (true | false)
  blinkRapid: (true | false)
  # Swap the foreground color and background color.
  inverse: (true | false)
  conceal: (true | false)
  crossOut: (true | false)
  frame: (true | false)
  encircle: (true | false)
  overline: (true | false)
  # Fore-color of text
  foreground: ("#xxxxxx" | rgb(0-256,0-256,0-256) | rgb(0x00-0xFF,0x00-0xFF,0x00-0xFF) | (name of colors))
  # Back-color of text
  background: # Same format as `foreground`

# Style of the "Start" lines.
  # Same format as `buildStyle`

# Style of the "Pass" lines.
  # Same format as `buildStyle`

# Style of the "Fail" lines.
  # Same format as `buildStyle`

# Style of the "Skip" lines.
  # Same format as `buildStyle`

# Style of the "File" lines.
  # Same format as `buildStyle`

# Style of the "Line" lines.
  # Same format as `buildStyle`

# Style of the "Pass" package lines.
  # Same format as `buildStyle`

# Style of the "Fail" package lines.
  # Same format as `buildStyle`

# A threashold of the coverage
coverThreshold: (0-100)

# Style of the "Cover" lines with the coverage that is higher than coverThreshold.
  # Same format as `buildStyle`

# Style of the "Cover" lines with the coverage that is lower than coverThreshold.
  # Same format as `buildStyle`

# If you want to delete lines, write the regular expressions.
  - (regexp)
# If you want to leave `Test` prefixes, set it "true".
leaveTestPrefix: (true | false)

Line categories

Rich-Go separate the output-lines in following categories.

  • Build:
    When the Go fails to build, it prints errors like this:

    sample/buildfail/buildfail_test.go:6: t.Foo undefined (type testing.T has no field or method Foo)
  • Start:
    In the top of test, Go prints that name like this:

    === RUN   TestSampleOK/SubtestOK
  • Pass:
    When a test is successed, Go prints that name like this:

        ---PASS: TestSampleOK/SubtestOK
  • Fail:
    When a test is failed, Go prints that name like this:

    --- FAIL: TestSampleNG (0.00s)
    sample_ng_test.go:9: It's not OK... :(
  • Skip:
    If there is no test files in directory or a test is skipped, Go prints that path or the name like this:

    --- SKIP: TestSampleSkip (0.00s)

? [no test files]

  • PassPackage:
    When tests in package are successed, Go prints just:

  • Fail:
    When a test in package are failed, Go prints just:

  • Cover:
    If the coverage analysis is enabled, Go prints the coverage like this:

    === RUN   TestCover05

--- PASS: TestCover05 (0.00s) PASS coverage: 50.0% of statements ok 0.012s coverage: 50.0% of statements

Each categories can be styled seperately.

Label types

  • Long:

    • Build: "BUILD"
    • Start: "START"
    • Pass: "PASS"
    • Fail: "FAIL"
    • Skip: "SKIP"
    • Cover: "COVER"
  • Short:

    • Build: "!!"
    • Start: ">"
    • Pass: "o"
    • Fail: "x"
    • Skip: "-"
    • Cover: "%"
  • None: Rich-Go will never output labels.


labelType: long
  bold: true
  foreground: yellow
  foreground: lightBlack
  foreground: green
  bold: true
  foreground: red
  foreground: lightBlack
  foreground: green
  hide: true
  bold: true
  foreground: red
  hide: true
coverThreshold: 50
  foreground: green
  bold: true
  foreground: yellow
  foreground: cyan
  foreground: magenta

Overriding colorization detection

By default, richgo determines whether or not to colorize its output based on whether it's connected to a TTY or not. This works for most use cases, but may not behave as expected if you use richgo in a pipeline of commands, where STDOUT is being piped to another command.

To force colorization, add RICHGO_FORCE_COLOR=1 to the environment you're running in. For example:

RICHGO_FORCE_COLOR=1 richgo test ./... | tee test.log

Configure to resolve a conflict with "Solarized dark" theme

The bright-black is used for background color in Solarized dark theme. Richgo uses that color for "startStyle" and "skipStyle", so "START" and "SKIP" lines can not be seen on the screen with Solarized dark theme.

To resolve that conflict, you can set another color for "startStyle" and "skipStyle" in .richstyle like below.

  foreground: yellow

  foreground: lightYellow

Getting a version of the richgo

If you want to get a version of the richgo, this information is embedded in the binary (since Go 1.18). You can view it with go version -m, e.g. for richgo 0.3.10:

$ go version -m $(command -v richgo)
./richgo: go1.18
	mod	v0.3.10	h1:iSGvcjhtQN2IVrBDhPk0if0R/RMQnCN1E/9OyAW4UUs=

And just a little more advanced way (with POSIX awk):

$ go version -m $(command -v richgo) | awk '$1 == "mod" && $2 == "" {print $3;}'


MIT License

This is distributed under the MIT License.