Add tests for Homebrew libyaml integration

test/build.bats

+#!/usr/bin/env bats
+
+load test_helper
+
+tarball() {
+  local name="$1"
+  local path="$TMP/$name"
+  local configure="$path/configure"
+
+  mkdir -p "$path"
+  cat > "$configure" <<OUT
+#!$BASH
+echo "$name: \$@" > build.log
+OUT
+  chmod +x "$configure"
+
+  tar czf "${path}.tgz" -C "$TMP" "$name"
+  echo "${path}.tgz"
+}
+
+stub_download() {
+  stub curl "-C - -o * -*S* $1 : cp '$(tarball "$2")' \$4"
+}
+
+@test "yaml is installed for ruby" {
+  mkdir -p "$INSTALL_ROOT/bin"
+
+  stub md5 false
+  stub brew false
+  stub_download "http://pyyaml.org/*" "yaml-0.1.4"
+  stub_download "http://ruby-lang.org/*" "ruby-2.0.0"
+  stub make \
+    ' : echo make "$@" >> build.log' \
+    "install : cp build.log '$INSTALL_ROOT/yaml.log'" \
+    ' : echo make "$@" >> build.log' \
+    "install : cp build.log '$INSTALL_ROOT/ruby.log'"
+
+  install_fixture definitions/needs-yaml
+  assert_success
+
+  unstub curl
+  unstub make
+
+  run cat "$INSTALL_ROOT/yaml.log"
+  assert_output <<OUT
+yaml-0.1.4: --prefix=$INSTALL_ROOT
+make -j 2
+OUT
+
+  run cat "$INSTALL_ROOT/ruby.log"
+  assert_output <<OUT
+ruby-2.0.0: --prefix=$INSTALL_ROOT
+make -j 2
+OUT
+}
+
+@test "yaml is linked from Homebrew" {
+  brew_libdir="$TMP/homebrew-yaml"
+  mkdir -p "$INSTALL_ROOT/bin"
+  mkdir -p "$brew_libdir"
+
+  stub md5 false
+  stub brew "--prefix libyaml : echo '$brew_libdir'"
+  stub_download "http://ruby-lang.org/*" "ruby-2.0.0"
+  stub make \
+    ' : echo make "$@" >> build.log' \
+    "install : cp build.log '$INSTALL_ROOT/ruby.log'"
+
+  install_fixture definitions/needs-yaml
+  assert_success
+
+  unstub brew
+  unstub curl
+  unstub make
+
+  run cat "$INSTALL_ROOT/ruby.log"
+  assert_output <<OUT
+ruby-2.0.0: --prefix=$INSTALL_ROOT --with-libyaml-dir=$brew_libdir
+make -j 2
+OUT
+}

test/fixtures/definitions/needs-yaml

+install_package "yaml-0.1.4" "http://pyyaml.org/download/libyaml/yaml-0.1.4.tar.gz" --if needs_yaml
+install_package "ruby-2.0.0" "http://ruby-lang.org/ruby/2.0/ruby-2.0.0.tar.gz"

test/test_helper.bash

@@ -23,7 +23,6 @@ stub() {
   mkdir -p "${TMP}/bin"
   ln -shf "${BATS_TEST_DIRNAME}/stubs/stub" "${TMP}/bin/${program}"
 
-  rm -f "${TMP}/${program}-stub-plan" "${TMP}/${program}-stub-run"
   touch "${TMP}/${program}-stub-plan"
   for arg in "$@"; do printf "%s\n" "$arg" >> "${TMP}/${program}-stub-plan"; done
 }
@@ -37,6 +36,7 @@ unstub() {
 
   "$path"
   rm -f "$path"
+  rm -f "${TMP}/${program}-stub-plan" "${TMP}/${program}-stub-run"
 }
 
 install_fixture() {
@@ -46,3 +46,51 @@ install_fixture() {
 
   run ruby-build "$FIXTURE_ROOT/$name" "$destination"
 }
+
+assert() {
+  if ! "$@"; then
+    flunk "failed: $@"
+  fi
+}
+
+flunk() {
+  { if [ "$#" -eq 0 ]; then cat -
+    else echo "$@"
+    fi
+  } | sed "s:${TMP}:\${TMP}:g" >&2
+  return 1
+}
+
+assert_success() {
+  if [ "$status" -ne 0 ]; then
+    { echo "command failed with exit status $status"
+      echo "output: $output"
+    } | flunk
+  elif [ "$#" -gt 0 ]; then
+    assert_output "$1"
+  fi
+}
+
+assert_failure() {
+  if [ "$status" -eq 0 ]; then
+    flunk "expected failed exit status"
+  elif [ "$#" -gt 0 ]; then
+    assert_output "$1"
+  fi
+}
+
+assert_equal() {
+  if [ "$1" != "$2" ]; then
+    { echo "expected: $1"
+      echo "actual:   $2"
+    } | flunk
+  fi
+}
+
+assert_output() {
+  local expected
+  if [ $# -eq 0 ]; then expected="$(cat -)"
+  else expected="$1"
+  fi
+  assert_equal "$expected" "$output"
+}