Installation

brew tap shellspec/shellspec brew install shellspec

run shellspec --init inside of a project directory to start a shellspec project.

this creates files like so:

tree ${project}
${project}
├── lib
│   └── hello.sh
└── spec
    ├── hello_spec.sh
    └── spec_helper.sh

Implement your functionality inside of lib/ and test it in the spec/ directory. suffix each file with _spec.sh and make sure to include the lib file in the project to allow it to be tested. An example might look like:

Describe "hello.sh"
  Include lib/hello.sh
  It "puts greeting, but not implemented"
    When call hello world
    The output should eq "Hello world!"
  End
End