Add initial version of test suite

test/ros2nix

@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+
+DIR=$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")/.." &> /dev/null && pwd)
+export PYTHONPATH="$DIR:$PYTHONPATH"
+exec python3 -m ros2nix "$@"

test/test.bats

@@ -0,0 +1,61 @@
+# -*- bats-mode -*-
+
+# shellcheck disable=SC2046
+
+bats_require_minimum_version 1.5.0
+bats_load_library bats-support
+bats_load_library bats-assert
+bats_load_library bats-file
+
+setup_file() {
+    # get the containing directory of this file
+    # use $BATS_TEST_FILENAME instead of ${BASH_SOURCE[0]} or $0,
+    # as those will point to the bats executable's location or the preprocessed file respectively
+    DIR="$( cd "$( dirname "$BATS_TEST_FILENAME" )" >/dev/null 2>&1 && pwd )"
+    export DIR
+    # make executables in this directory visible to PATH
+    PATH="$DIR:$PATH"
+}
+
+setup() {
+    cd "$BATS_TEST_TMPDIR"
+    cp -a "$DIR/ws" .
+}
+
+@test "ros2nix --help" {
+    ros2nix --help
+}
+
+@test "fail on non-existent package.xml" {
+    run ! ros2nix ./non-existent.xml
+}
+
+@test "nixify local workspace" {
+    ros2nix $(find ws/src -name package.xml)
+    nix-build -A rosPackages.humble.ros-node -A rosPackages.jazzy.ros-node -A rosPackages.rolling.ros-node
+}
+
+@test "--output-as-nix-pkg-name" {
+    ros2nix --output-as-nix-pkg-name $(find ws/src -name package.xml)
+    assert [ -f ros-node.nix ]
+    assert [ -f library.nix ]
+    nix-build -A rosPackages.jazzy.ros-node
+}
+
+@test "--output-as-ros-pkg-name" {
+    ros2nix --output-as-ros-pkg-name $(find ws/src -name package.xml)
+    assert [ -f ros_node.nix ]
+    assert [ -f library.nix ]
+    nix-build -A rosPackages.jazzy.ros-node
+}
+
+@test "--flake" {
+    ros2nix --flake $(find ws/src -name package.xml)
+    nix flake check path:"${PWD}"
+    nix build path:"${PWD}#ros-node"
+}
+
+@test "--compare" {
+    ros2nix $(find ws/src -name package.xml)
+    ros2nix --compare $(find ws/src -name package.xml)
+}