[244] Add $schema tests that test presence in subschemas

Author: ssilverman

tests/draft2019-09/meta/core.json

@@ -43,9 +43,58 @@
       {
         "description": "Valid $schema",
         "data": {
-          "$schema": "http://example.com/foo"
+          "$schema": "https://json-schema.org/draft/2019-09/schema"
         },
         "valid": true
+      },
+      {
+        "description": "$schema in subschema with no canonical ID: in allOf",
+        "data": {
+          "allOf": [
+            {
+              "$schema": "https://json-schema.org/draft/2019-09/schema"
+            }
+          ]
+        },
+        "valid": false
+      },
+      {
+        "description": "$schema in subschema with no canonical ID: in referenced",
+        "data": {
+          "$ref": "#/$defs/A",
+          "$defs": {
+            "A": {
+              "$schema": "https://json-schema.org/draft/2019-09/schema"
+            }
+          }
+        },
+        "valid": false
+      },
+      {
+        "description": "$schema in subschema with canonical ID: has $id",
+        "data": {
+          "$ref": "#/$defs/A",
+          "$defs": {
+            "A": {
+              "$id": "other",
+              "$schema": "https://json-schema.org/draft/2019-09/schema"
+            }
+          }
+        },
+        "valid": true
+      },
+      {
+        "description": "$schema in subschema with canonical ID: has $anchor",
+        "data": {
+          "$ref": "#/$defs/A",
+          "$defs": {
+            "A": {
+              "$anchor": "name",
+              "$schema": "https://json-schema.org/draft/2019-09/schema"
+            }
+          }
+        },
+        "valid": false
       }
     ]
   },