add schema unit tests (hashicorp#530)

test/unit/schema.bats

@@ -0,0 +1,46 @@
+#!/usr/bin/env bats
+
+load _helpers
+
+# These tests are just to verify there is a schema file used in the chart. Since
+# .enabled is defined as a boolean type for each of the top-level blocks in the
+# schema, setting it as a string fails 'helm template'.
+@test "schema: csi enabled datatype" {
+  cd `chart_dir`
+  run helm template . --set csi.enabled="nope"
+  [ "$status" -eq 1 ]
+  [ "${lines[2]}" = "- csi.enabled: Invalid type. Expected: boolean, given: string" ]
+
+  run helm template . --set csi.enabled=true
+  [ "$status" -eq 0 ]
+}
+
+@test "schema: injector enabled datatype" {
+  cd `chart_dir`
+  run helm template . --set injector.enabled="nope"
+  [ "$status" -eq 1 ]
+  [ "${lines[2]}" = "- injector.enabled: Invalid type. Expected: boolean, given: string" ]
+
+  run helm template . --set injector.enabled=true
+  [ "$status" -eq 0 ]
+}
+
+@test "schema: server enabled datatype" {
+  cd `chart_dir`
+  run helm template . --set server.enabled="nope"
+  [ "$status" -eq 1 ]
+  [ "${lines[2]}" = "- server.enabled: Invalid type. Expected: boolean, given: string" ]
+
+  run helm template . --set server.enabled=true
+  [ "$status" -eq 0 ]
+}
+
+@test "schema: ui enabled datatype" {
+  cd `chart_dir`
+  run helm template . --set ui.enabled="nope"
+  [ "$status" -eq 1 ]
+  [ "${lines[2]}" = "- ui.enabled: Invalid type. Expected: boolean, given: string" ]
+
+  run helm template . --set ui.enabled=true
+  [ "$status" -eq 0 ]
+}