Fix buildpipe not working if any attributes are used on the wait step (#91)

* Fix buildpipe not working if any attributes are used on the wait step

* add tests

Author: oallenj

pipeline.go

@@ -104,8 +104,9 @@ func generatePipeline(steps []interface{}, pipelineEnv map[string]string, projec
 
 		env, foundEnv := stepMap["env"].(map[interface{}]interface{})
 		_, foundBlockStep := stepMap["block"].(string)
+		_, foundWaitStep := stepMap["wait"]
 
-		if !foundBlockStep {
+		if !foundBlockStep && !foundWaitStep {
 			if !foundEnv {
 				env = make(map[interface{}]interface{})
 				stepMap["env"] = env

tests/Dockerfile

@@ -7,7 +7,7 @@ COPY .	.
 RUN make clean
 RUN make build-linux
 
-FROM buildkite/plugin-tester
+FROM buildkite/plugin-tester:v1.1.0
 
 COPY .	.
 

tests/dynamic_pipeline.yml

@@ -28,7 +28,7 @@ steps: # the same schema as regular buildkite pipeline steps
     command:
       - cd $$BUILDPIPE_PROJECT_PATH # BUILDPIPE_PROJECT_PATH will be set by buildpipe
       - make test
-  - wait
+  - wait: ~
   - label: build
     branches: "master"
     env:

tests/post-command.bats

@@ -51,7 +51,7 @@ steps:
     TEST_ENV_PROJECT: test-project
   key: test:project1
   label: test project1
-- wait
+- wait: null
 - agents:
   - queue=build
   branches: master