Add a BATS test too

Author: toolmantim

.gitignore

@@ -0,0 +1 @@
+/tests/tmp

tests/command.bats

@@ -2,9 +2,33 @@
 
 load "$BATS_PATH/load.bash"
 
-@test "calls git log" {
-  stub git "log : echo some-log"
-  git log
+# Uncomment to get debug output from each stub
+# export MKTEMP_STUB_DEBUG=/dev/tty
+# export BUILDKITE_AGENT_STUB_DEBUG=/dev/tty
+# export DOCKER_STUB_DEBUG=/dev/tty
+
+@test "runs the annotator and creates the annotation" {
+  export BUILDKITE_PLUGIN_JUNIT_ANNOTATE_ARTIFACTS="junits/*.xml"
+
+  artifacts_tmp="tests/tmp/$PWD/junit-artifacts"
+  annotation_tmp="tests/tmp/$PWD/junit-annotation"
+
+  stub mktemp \
+    "-d junit-annotate-plugin-artifacts-tmp.XXXXXXXXXX : mkdir -p $artifacts_tmp; echo $artifacts_tmp" \
+    "-d junit-annotate-plugin-annotation-tmp.XXXXXXXXXX : mkdir -p $annotation_tmp; echo $annotation_tmp"
+
+  stub buildkite-agent "artifact download junits/*.xml /plugin/tests/tmp//plugin/junit-artifacts : echo Downloaded artifacts" \
+                       "annotate --context junit --style error : echo Annotation added"
+
+  stub docker "--log-level error run --rm --volume /plugin/tests/tmp//plugin/junit-artifacts:/junits --volume /plugin/hooks/../ruby:/src --env BUILDKITE_PLUGIN_JUNIT_ANNOTATE_JOB_UUID_FILE_PATTERN= ruby:2.5-alpine /src/bin/annotate /junits : echo ANNOTATION"
+
+  run "$PWD/hooks/command"
+
   assert_success
-  unstub git
+
+  assert_output --partial "Annotation added"
+  
+  unstub mktemp
+  unstub buildkite-agent
+  unstub docker
 }