Added tests for multi-level behaviour

Author: toote

tests/post-command.bats

@@ -208,3 +208,46 @@ teardown() {
 
   unstub cache_dummy
 }
+
+@test "Multiple level saving not forced" {
+  export BUILDKITE_PLUGIN_CACHE_FORCE=false
+
+  export BUILDKITE_PLUGIN_CACHE_SAVE_0=all
+  export BUILDKITE_PLUGIN_CACHE_SAVE_1=pipeline
+
+  stub cache_dummy \
+    "exists \* \* : exit 0" \
+    "exists \* \* : exit 1" \
+    "save \* \* : echo saving \$3 in \$2"
+
+  run "$PWD/hooks/post-command"
+
+  assert_success
+  assert_output --partial 'Saving all-level cache'
+  refute_output --partial 'Saving pipeline-level cache'
+
+  unstub cache_dummy
+}
+
+@test "Multiple level saving lower level change forces higher levels" {
+  export BUILDKITE_PLUGIN_CACHE_FORCE=false
+
+  export BUILDKITE_PLUGIN_CACHE_SAVE_0=all
+  export BUILDKITE_PLUGIN_CACHE_SAVE_1=pipeline
+  export BUILDKITE_PLUGIN_CACHE_SAVE_2=step
+
+  stub cache_dummy \
+    "exists \* \* : exit 0" \
+    "exists \* \* : exit 1" \
+    "save \* \* : echo saving \$3 in \$2" \
+    "save \* \* : echo saving \$3 in \$2"
+
+  run "$PWD/hooks/post-command"
+
+  assert_success
+  assert_output --partial 'Saving all-level cache'
+  assert_output --partial 'Saving pipeline-level cache'
+  refute_output --partial 'Saving step-level cache'
+
+  unstub cache_dummy
+}