bats-test-scaffolder

Testing & Quality

Generate BATS test structure and fixtures for shell script testing with setup/teardown, assertions, and mocking.

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BATS Test Scaffolder

Generate BATS test structure for shell script testing.

Capabilities

Generate BATS test files
Create setup and teardown fixtures
Implement custom assertions
Set up mocking helpers
Configure test isolation
Generate test helpers

Usage

Invoke this skill when you need to:

Set up BATS testing for shell scripts
Create test fixtures and helpers
Implement mock functions
Generate test cases

Generated Test Structure

tests/
├── bats/
│   └── bats-*.bash        # BATS submodules
├── test_helper/
│   ├── common-setup.bash  # Common setup
│   └── mocks.bash         # Mock helpers
├── fixtures/
│   ├── input.txt          # Test fixtures
│   └── expected.txt
└── *.bats                  # Test files

Test File Template

#!/usr/bin/env bats

# Load test helpers
load 'test_helper/common-setup'

# Setup runs before each test
setup() {
    common_setup
    # Test-specific setup
    export TEST_DIR="$(mktemp -d)"
}

# Teardown runs after each test
teardown() {
    # Cleanup
    rm -rf "${TEST_DIR}"
}

@test "script displays help with --help" {
    run ./script.sh --help

    assert_success
    assert_output --partial "Usage:"
}

@test "script fails without required argument" {
    run ./script.sh

    assert_failure
    assert_output --partial "Missing required argument"
}

@test "script processes input file" {
    cp fixtures/input.txt "${TEST_DIR}/"

    run ./script.sh "${TEST_DIR}/input.txt"

    assert_success
    assert_output --partial "Processing complete"
}

@test "script creates output file" {
    run ./script.sh -o "${TEST_DIR}/output.txt" fixtures/input.txt

    assert_success
    assert_file_exists "${TEST_DIR}/output.txt"
}

@test "script handles special characters in filename" {
    local special_file="${TEST_DIR}/file with spaces.txt"
    echo "test" > "${special_file}"

    run ./script.sh "${special_file}"

    assert_success
}

Test Helper (test_helper/common-setup.bash)

#!/usr/bin/env bash

# Load BATS support libraries
load 'bats/bats-support/load'
load 'bats/bats-assert/load'
load 'bats/bats-file/load'

# Common setup for all tests
common_setup() {
    # Get the containing directory
    PROJECT_ROOT="$(cd "$(dirname "$BATS_TEST_FILENAME")/.." && pwd)"

    # Add scripts to PATH
    PATH="${PROJECT_ROOT}/bin:${PATH}"

    # Set up test temp directory
    TEST_TEMP_DIR="$(mktemp -d)"
}

# Common teardown
common_teardown() {
    rm -rf "${TEST_TEMP_DIR}"
}

# Custom assertion: check exit code
assert_exit_code() {
    local expected="$1"
    if [[ "${status}" -ne "${expected}" ]]; then
        echo "Expected exit code ${expected}, got ${status}" >&2
        return 1
    fi
}

# Mock a command
mock_command() {
    local cmd="$1"
    local response="$2"

    eval "${cmd}() { echo '${response}'; }"
    export -f "${cmd}"
}

Target Processes

shell-script-development
cli-unit-integration-testing
cross-platform-cli-compatibility