test(markdown-builder): add test for enums

taken from #458

test/fixtures/enums/enum-meta-enum.schema.json

@@ -0,0 +1,74 @@
+{
+  "type": "object",
+  "properties": {
+    "homie": {
+      "type": "string",
+      "enum": [
+        "integer",
+        "float",
+        "boolean",
+        "string",
+        "enum",
+        "color",
+        "datetime",
+        "duration",
+        "json"
+      ],
+      "title": "HomieDatatype",
+      "description": "Specifies the datatype of the property value payload.",
+      "meta:enum": {
+        "integer": "TODO: describe",
+        "float": "TODO: describe",
+        "boolean": "TODO: describe.",
+        "string": "TODO: describe",
+        "enum": "TODO: describe",
+        "color": "TODO: describe",
+        "datetime": "TODO: describe",
+        "duration": "TODO: describe",
+        "json": "TODO: describe"
+      }
+    },
+    "withmeta": {
+      "foo": "bar",
+      "enum": [
+        "baa",
+        "bad",
+        "bag",
+        "bah",
+        "bam",
+        "ban",
+        "bap",
+        "bas",
+        "bat",
+        "bay"
+      ],
+      "meta:enum": {
+        "baa": "the sounds of sheeps",
+        "bad": "German bathroom",
+        "bag": "holding device",
+        "bah": "humbug!",
+        "bam": "a loud sound",
+        "ban": "don't do this",
+        "bap": "a British soft bread roll",
+        "bas": "from ancient Egyptian religion, an aspect of the soul",
+        "bat": "…out of hell",
+        "bay": ", sitting by the dock of the"
+      }
+    },
+    "withoutmeta": {
+      "bar": "foo",
+      "enum": [
+        "baa",
+        "bad",
+        "bag",
+        "bah",
+        "bam",
+        "ban",
+        "bap",
+        "bas",
+        "bat",
+        "bay"
+      ]
+    }
+  }
+}