dev-cmd/tests: add --fail-fast.

Library/Homebrew/dev-cmd/tests.rb

@@ -24,6 +24,8 @@ def tests_args
              description: "Enable debugging using byebug."
       switch "--changed",
              description: "Only runs tests on files that were changed from the master branch."
+      switch "--fail-fast",
+             description: "Exit early on the first failing test."
       flag   "--only=",
              description: "Run only <test_script>`_spec.rb`. Appending `:`<line_number> will start at a " \
                           "specific line."
@@ -153,6 +155,7 @@ def tests
         --color
         --require spec_helper
       ]
+      bundle_args << "--fail-fast" if args.fail_fast?
 
       # TODO: Refactor and move to extend/os
       # rubocop:disable Homebrew/MoveToExtendOS

completions/bash/brew

@@ -2210,6 +2210,7 @@ _brew_tests() {
       --changed
       --coverage
       --debug
+      --fail-fast
       --generic
       --help
       --online

completions/fish/brew.fish

@@ -1470,6 +1470,7 @@ __fish_brew_complete_arg 'tests' -l byebug -d 'Enable debugging using byebug'
 __fish_brew_complete_arg 'tests' -l changed -d 'Only runs tests on files that were changed from the master branch'
 __fish_brew_complete_arg 'tests' -l coverage -d 'Generate code coverage reports'
 __fish_brew_complete_arg 'tests' -l debug -d 'Display any debugging information'
+__fish_brew_complete_arg 'tests' -l fail-fast -d 'Exit early on the first failing test'
 __fish_brew_complete_arg 'tests' -l generic -d 'Run only OS-agnostic tests'
 __fish_brew_complete_arg 'tests' -l help -d 'Show this message'
 __fish_brew_complete_arg 'tests' -l online -d 'Include tests that use the GitHub API and tests that use any of the taps for official external commands'

completions/zsh/_brew

@@ -1815,6 +1815,7 @@ _brew_tests() {
     '(--only)--changed[Only runs tests on files that were changed from the master branch]' \
     '--coverage[Generate code coverage reports]' \
     '--debug[Display any debugging information]' \
+    '--fail-fast[Exit early on the first failing test]' \
     '--generic[Run only OS-agnostic tests]' \
     '--help[Show this message]' \
     '--online[Include tests that use the GitHub API and tests that use any of the taps for official external commands]' \

docs/Manpage.md

@@ -1579,6 +1579,8 @@ Run Homebrew's unit and integration tests.
   Enable debugging using byebug.
 * `--changed`:
   Only runs tests on files that were changed from the master branch.
+* `--fail-fast`:
+  Exit early on the first failing test.
 * `--only`:
   Run only *`test_script`*`_spec.rb`. Appending `:`*`line_number`* will start at a specific line.
 * `--seed`:

manpages/brew.1

@@ -2274,6 +2274,10 @@ Enable debugging using byebug\.
 Only runs tests on files that were changed from the master branch\.
 .
 .TP
+\fB\-\-fail\-fast\fR
+Exit early on the first failing test\.
+.
+.TP
 \fB\-\-only\fR
 Run only \fItest_script\fR\fB_spec\.rb\fR\. Appending \fB:\fR\fIline_number\fR will start at a specific line\.
 .