Add tests for option flags

Based on the flags listed in the current README, add tests for their
functionality.

.dockerignore

@@ -0,0 +1,5 @@
+# Exclude all files from the Docker build context by default.
+# This speeds up the start time of any `dock` command.
+#
+# Whitelist files/patterns for inclusion by prepending "!" to them.
+*

README.md

@@ -46,13 +46,13 @@ it works.
 ```bash
 git clone git://github.com/brigade/dock
 cd dock
-dock
+bin/dock # If you have installed Dock then you can just run `dock`
 ```
 
 After running `dock` inside the Dock repository, you should be running inside
 a Docker container. Your current directory will be `/repo` inside that
 container, and the contents of that directory will be the Dock repository
-itself.
+itself (i.e. the current project).
 
 ```
 $ pwd
@@ -64,7 +64,7 @@ Dockerfile LICENSE.md README.md ...
 Any changes you make to these files will automatically be reflected in the
 original repository, and vice versa. This allows you to continue using your
 favorite tools and editors to make changes to your project, but actually
-run code or tests _inside_ the container so it is isolated from the rest of
+run code or tests _inside_ the container to isolate these from the rest of
 your system.
 
 ## Usage

run-tests

@@ -0,0 +1,41 @@
+#!/bin/bash
+#
+# Runs all tests.
+#
+# Specify a path to run only that test file.
+
+start_docker() {
+  # Don't do anything if daemon already running
+  if docker info >/dev/null 2>&1; then
+    return
+  fi
+
+  sudo dockerd >/dev/null 2>&1 &
+  dockerd_pid=$!
+
+  local max_tries=5
+  for i in {1..5}; do
+    if docker info >/dev/null 2>&1; then
+      break
+    fi
+    echo "Waiting for Docker daemon to start ($i/5)..." >&2
+    sleep 1
+  done
+
+  if ! docker info >/dev/null 2>&1; then
+    echo "Docker daemon failed to start!" >&2
+    return 1
+  fi
+}
+
+stop_docker() {
+  echo "Shutting down Docker daemon..." >&2
+  sudo kill $dockerd_pid 2>&1 >/dev/null || true
+  wait $dockerd_pid
+}
+
+trap "stop_docker" EXIT INT QUIT TERM
+start_docker
+unset INSIDE_DOCK
+
+bats "$@"

test/options/attach.bats

@@ -0,0 +1,37 @@
+#!/usr/local/bin/dock bats
+
+load ../utils
+
+project_name=my-project
+
+setup() {
+  destroy-all-containers
+  original_dir="$(pwd)"
+  cd "$(create_repo ${project_name})"
+}
+
+teardown() {
+  cd "${original_dir}"
+}
+
+@test "attaching when container is already running" {
+  docker run --detach --interactive --name "${project_name}-dock" alpine:latest \
+    sleep 5
+  run dock -a
+  # 137 status means we were killed by the container exiting
+  [ "$status" -eq 137 ]
+}
+
+@test "attaching when container exists but is not running" {
+  docker run --name "${project_name}-dock" alpine:latest echo
+  run dock -a
+  [ "$status" -eq 1 ]
+  [[ "${lines[0]}" =~ "Container ${project_name}-dock exists but is not running, so you can't attach" ]]
+}
+
+@test "attaching when no container exists" {
+  run dock -a
+  [ "$status" -eq 1 ]
+  [[ "${lines[0]}" =~ "No container named ${project_name}-dock is currently running." ]]
+  [[ "${lines[1]}" =~ "You must start the container first before you can attach!" ]]
+}

test/options/config.bats

@@ -0,0 +1,24 @@
+#!/usr/local/bin/dock bats
+
+load ../utils
+
+project_name=my-project
+
+setup() {
+  destroy-all-containers
+  original_dir="$(pwd)"
+  cd "$(create_repo ${project_name})"
+  echo "image=alpine:latest" >> .dock
+  echo "command='exit 1'" >> .dock
+}
+
+teardown() {
+  cd "${original_dir}"
+}
+
+@test "specifying an explicit config file" {
+  echo "image=alpine:latest" >> .other-dock
+  echo "command=echo" >> .other-dock
+  run dock -d -c .other-dock sh
+  [ "$status" -eq 0 ]
+}

test/options/detach.bats

@@ -0,0 +1,22 @@
+#!/usr/local/bin/dock bats
+
+load ../utils
+
+project_name=my-project
+
+setup() {
+  destroy-all-containers
+  original_dir="$(pwd)"
+  cd "$(create_repo ${project_name})"
+  echo "image=alpine:latest" > .dock
+}
+
+teardown() {
+  cd "${original_dir}"
+}
+
+@test "running Dock container as detached" {
+  run dock -d sh
+  [ "$status" -eq 0 ]
+  container-running "${project_name}-dock"
+}

test/options/force.bats

@@ -0,0 +1,23 @@
+#!/usr/local/bin/dock bats
+
+load ../utils
+
+project_name=my-project
+
+setup() {
+  destroy-all-containers
+  original_dir="$(pwd)"
+  cd "$(create_repo ${project_name})"
+  echo "image=alpine:latest" > .dock
+}
+
+teardown() {
+  cd "${original_dir}"
+}
+
+@test "forcibly removing existing Dock container" {
+  container_id="$(dock -d sh)"
+  run dock -f echo
+  [ "$status" -eq 0 ]
+  ! container-running "$container_id"
+}

test/utils.bash

@@ -0,0 +1,23 @@
+# Defines helper functions used across a variety of tests.
+
+create_repo() {
+  local dir_name="${1:-}"
+  if [ -z "${dir_name}" ]; then
+    repo_path="$(mktemp --directory)"
+  else
+    repo_path="$(mktemp --directory)/${dir_name}"
+  fi
+
+  mkdir -p "${repo_path}"
+  git init "${repo_path}" >/dev/null 2>&1
+
+  echo ${repo_path}
+}
+
+destroy-all-containers() {
+  docker ps -aq | xargs --no-run-if-empty docker rm --force
+}
+
+container-running() {
+  [ "$(docker inspect --format={{.State.Status}} "$1")" = running ]
+}