add tdd for a better reloader

test/bash_it/bash_it.bats

@@ -1,20 +1,10 @@
 #!/usr/bin/env bats
 
 load ../test_helper
-load ../../lib/composure
 
 function local_setup {
   setup_test_fixture
-
-  # Copy the test fixture to the Bash-it folder
-  if command -v rsync &> /dev/null
-  then
-    rsync -a "$BASH_IT/test/fixtures/bash_it/" "$BASH_IT/"
-  else
-    find "$BASH_IT/test/fixtures/bash_it" \
-      -mindepth 1 -maxdepth 1 \
-      -exec cp -r {} "$BASH_IT/" \;
-  fi
+  copy_test_fixtures
 }
 
 @test "bash-it: verify that the test fixture is available" {

test/fixtures/bash_it/plugins/available/exit-nonzero.bash

@@ -0,0 +1,7 @@
+# shellcheck shell=bash
+about-plugin 'fixture plugin for testing plugins that exit with non-0 exit codes'
+
+printf 'exit-nonzero: stdout message\n'
+printf 'exit-nonzero: stderr message\n' >&2
+
+exit 123

test/fixtures/bash_it/plugins/available/exit-zero.bash

@@ -0,0 +1,7 @@
+# shellcheck shell=bash
+about-plugin 'fixture plugin for testing plugins that exit with a 0 exit code'
+
+printf 'exit-zero: stdout message\n'
+printf 'exit-zero: stderr message\n' >&2
+
+exit 0

test/fixtures/bash_it/plugins/available/return-nonzero.bash

@@ -0,0 +1,7 @@
+# shellcheck shell=bash
+about-plugin 'fixture plugin for testing plugins that return with a non-0 return code'
+
+printf 'return-nonzero: stdout message\n'
+printf 'return-nonzero: stderr message\n' >&2
+
+return 123

test/fixtures/bash_it/plugins/available/return-zero.bash

@@ -0,0 +1,7 @@
+# shellcheck shell=bash
+about-plugin 'fixture plugin for testing plugins that return with a 0 return code'
+
+printf 'return-zero: stdout message\n'
+printf 'return-zero: stderr message\n' >&2
+
+return 0

test/fixtures/bash_it/plugins/available/zz.plugin.bash

@@ -0,0 +1,4 @@
+# shellcheck shell=bash
+about-plugin 'here to load last. a canary test for silent failures.'
+
+printf 'You found me!'

test/lib/reloader.bats

@@ -0,0 +1,82 @@
+
+#!/usr/bin/env bats
+
+load ../test_helper
+
+function local_setup {
+  setup_test_fixture
+  copy_test_fixtures
+
+  # log everything to verify output
+  BASH_IT_LOG_LEVEL=3
+}
+
+@test "reloader: exit-nonzero" {
+  # use bash-it to enable the fixture
+  load "$BASH_IT/bash_it.sh"
+
+  run bash-it enable plugin exit-nonzero
+  assert_success
+
+  run bash-it enable plugin zz
+  assert_success
+
+  run source "${BASH_IT}/scripts/reloader.bash"
+  assert_success
+}
+
+@test "reloader: exit-zero" {
+  # use bash-it to enable the fixture
+  load "$BASH_IT/bash_it.sh"
+
+  run bash-it enable plugin exit-zero
+  assert_success
+
+  run bash-it enable plugin zz
+  assert_success
+
+  run source "${BASH_IT}/scripts/reloader.bash"
+  assert_success
+}
+
+@test "reloader: return-nonzero" {
+  # use bash-it to enable the fixture
+  load "$BASH_IT/bash_it.sh"
+
+  run bash-it enable plugin return-nonzero
+  assert_success
+
+  run bash-it enable plugin zz
+  assert_success
+
+  run source "${BASH_IT}/scripts/reloader.bash"
+  assert_success
+
+  assert_line 'DEBUG: bash: return-nonzero.bash: Loading component...'
+  assert_line 'return-nonzero: stdout message'
+  assert_line 'return-nonzero: stderr message'
+
+  assert_line 'DEBUG: plugin: zz: Loading component...'
+  assert_line 'You found me!'
+}
+
+@test "reloader: return-zero" {
+  # use bash-it to enable the fixture
+  load "$BASH_IT/bash_it.sh"
+
+  run bash-it enable plugin return-zero
+  assert_success
+
+  run bash-it enable plugin zz
+  assert_success
+
+  run source "${BASH_IT}/scripts/reloader.bash"
+  assert_success
+
+  assert_line 'DEBUG: bash: return-zero.bash: Loading component...'
+  assert_line 'return-zero: stdout message'
+  assert_line 'return-zero: stderr message'
+
+  assert_line 'DEBUG: plugin: zz: Loading component...'
+  assert_line 'You found me!'
+}

test/run

@@ -1,4 +1,5 @@
 #!/usr/bin/env bash
+
 test_directory="$(cd "$(dirname "$0")" && pwd)"
 bats_executable="${test_directory}/../test_lib/bats-core/bin/bats"
 
@@ -6,14 +7,14 @@ git submodule init && git submodule update
 
 if [ -z "${BASH_IT}" ]; then
 	declare BASH_IT
-  BASH_IT=$(cd ${test_directory} && dirname "$(pwd)")
+	BASH_IT=$(cd "${test_directory}" && dirname "$(pwd)")
 	export BASH_IT
 fi
 
 if [ -z "$1" ]; then
-  test_dirs=( ${test_directory}/{bash_it,completion,install,lib,plugins,themes} )
+	test_dirs=("${test_directory}"/{bash_it,completion,install,lib,plugins,themes})
 else
-  test_dirs=( "$1" )
+	test_dirs=("$1")
 fi
 
 # Make sure that the `parallel` command is installed,
@@ -22,26 +23,22 @@ fi
 # so we can run `bats` in parallel processing mode, which is a lot faster.
 if command -v parallel &> /dev/null \
 	&& parallel -V &> /dev/null \
-  && { parallel -V 2> /dev/null | grep -q '^GNU\>'; }
-then
+	&& { parallel -V 2> /dev/null | grep -q '^GNU\>'; }; then
 	# Expect to run at least on a dual-core CPU; slightly degraded performance
 	# shouldn't matter otherwise.
 	declare -i -r test_jobs_default=2
 	declare -i -r test_jobs_effective="$(
 		if [ "${TEST_JOBS:-detect}" = "detect" ] \
-      && command -v nproc &> /dev/null
-    then
+			&& command -v nproc &> /dev/null; then
 			nproc
 		elif [ -n "${TEST_JOBS}" ] \
-      && [ "${TEST_JOBS}" != "detect" ]
-    then
+			&& [ "${TEST_JOBS}" != "detect" ]; then
 			echo "${TEST_JOBS}"
 		else
 			echo ${test_jobs_default}
 		fi
 	)"
-  exec "$bats_executable" ${CI:+--tap} --jobs ${test_jobs_effective} \
-    "${test_dirs[@]}"
+	exec "$bats_executable" ${CI:+--tap} --jobs "${test_jobs_effective}" "${test_dirs[@]}"
 else
 	# Run `bats` in single-threaded mode.
 	exec "$bats_executable" ${CI:+--tap} "${test_dirs[@]}"

test/test_helper.bash

@@ -1,5 +1,4 @@
 #!/usr/bin/env bats
-load ../../lib/composure
 
 unset BASH_IT_THEME
 unset GIT_HOSTING
@@ -20,7 +19,9 @@ load "${TEST_DEPS_DIR}/bats-assert/load.bash"
 load "${TEST_DEPS_DIR}/bats-file/load.bash"
 
 # support 'plumbing' metadata
+load ../../lib/composure
 cite _about _param _example _group _author _version
+cite about-alias about-completion about-plugin
 
 local_setup() {
 	true
@@ -39,8 +40,7 @@ setup_test_fixture() {
 	lib_directory="$(cd "$(dirname "$0")" && pwd)"
 	local src_topdir="$lib_directory/../../../.."
 
-  if command -v rsync &> /dev/null
-  then
+	if command -v rsync &> /dev/null; then
 		# Use rsync to copy Bash-it to the temp folder
 		rsync -qavrKL -d --delete-excluded --exclude=.git --exclude=enabled "$src_topdir" "$BASH_IT"
 	else
@@ -67,6 +67,17 @@ setup_test_fixture() {
 	export BASH_IT_TEST_HOME="$TEST_TEMP_DIR"
 }
 
+copy_test_fixtures() {
+	# Copy the test fixture to the Bash-it folder
+	if command -v rsync &> /dev/null; then
+		rsync -qa "$BASH_IT/test/fixtures/bash_it/" "$BASH_IT/"
+	else
+		find "$BASH_IT/test/fixtures/bash_it" \
+			-mindepth 1 -maxdepth 1 \
+			-exec cp -r {} "$BASH_IT/" \;
+	fi
+}
+
 setup() {
 	# The `temp_make` function from "bats-file" requires the tralston/bats-file fork,
 	# since the original ztombol/bats-file's `temp_make` does not work on macOS.