Add tests for $defs and const normalizers

Author: awlayton

test/__snapshots__/test/test.ts.md

@@ -182,6 +182,24 @@ Generated by [AVA](https://avajs.dev).
     }␊
     `
 
+## Non object items.items
+
+> Snapshot 1
+
+    `{␊
+      "id": "foo",␊
+      "type": "object",␊
+      "properties": {␊
+        "myProperty": {␊
+          "type": "array",␊
+          "items": "string",␊
+          "minItems": 0␊
+        }␊
+      },␊
+      "additionalProperties": false,␊
+      "required": []␊
+    }`
+
 ## Normalise ignoreMinAndMaxItems
 
 > Snapshot 1
@@ -524,6 +542,28 @@ Generated by [AVA](https://avajs.dev).
       "required": []␊
     }`
 
+## Normalize $defs to definitions
+
+> Snapshot 1
+
+    `{␊
+      "id": "foo",␊
+      "definitions": {␊
+        "bar": "baz"␊
+      }␊
+    }`
+
+## Normalize const to singleton enum
+
+> Snapshot 1
+
+    `{␊
+      "id": "foo",␊
+      "enum": [␊
+        "foobar"␊
+      ]␊
+    }`
+
 ## Normalize schema.items
 
 > Snapshot 1
@@ -3555,21 +3595,3 @@ Generated by [AVA](https://avajs.dev).
       [k: string]: unknown;␊
     }␊
     `
-
-## Non object items.items
-
-> Snapshot 1
-
-    `{␊
-      "id": "foo",␊
-      "type": "object",␊
-      "properties": {␊
-        "myProperty": {␊
-          "type": "array",␊
-          "items": "string",␊
-          "minItems": 0␊
-        }␊
-      },␊
-      "additionalProperties": false,␊
-      "required": []␊
-    }`

test/__snapshots__/test/test.ts.snap

@@ -0,0 +1,11 @@
+{
+  "name": "Normalize const to singleton enum",
+  "in": {
+    "id": "foo",
+    "const": "foobar"
+  },
+  "out": {
+    "id": "foo",
+    "enum": ["foobar"]
+  }
+}

test/normalizer/constToEnum.json

@@ -0,0 +1,15 @@
+{
+  "name": "Normalize $defs to definitions",
+  "in": {
+    "id": "foo",
+    "$defs" : {
+      "bar": "baz"
+    }
+  },
+  "out": {
+    "id": "foo",
+    "definitions" : {
+      "bar": "baz"
+    }
+  }
+}