chore: improve test coverage

test/ContextParser-test.ts

@@ -1,4 +1,5 @@
 import {
+  ContextCache,
   ContextParser,
   ERROR_CODES,
   ErrorCoded,
@@ -1465,7 +1466,25 @@ Tried mapping @id to {}`, ERROR_CODES.KEYWORD_REDEFINITION));
       it('should resolve to the same object when parse is called on the same context', async () => {
         await expect(parser.parse({ name: "http://xmlns.com/foaf/0.1/name" })).resolves
           .toBe(await parser.parse({ name: "http://xmlns.com/foaf/0.1/name" }));
-      })
+      });
+
+      it('should resolve to the same object when parse is called on the same context and with empty parent', async () => {
+        await expect(parser.parse({ name: "http://xmlns.com/foaf/0.1/name" })).resolves
+          .toEqual(await parser.parse({ name: "http://xmlns.com/foaf/0.1/name" }, {
+            parent: new JsonLdContextNormalized({}),
+          }));
+      });
+
+      it('should respect the LRU cache and discard elements once max is reached', async () => {
+        const myParser = new ContextParser({
+          contextCache: new ContextCache({ max: 1 }),
+        });
+
+        const r1 = await myParser.parse({ name: "http://xmlns.com/foaf/0.1/name" });
+        await myParser.parse({ name1: "http://xmlns.com/foaf/0.1/name" });
+        const r3 = await myParser.parse({ name: "http://xmlns.com/foaf/0.1/name" });
+        expect(r1).not.toBe(r3);
+      });
 
       it('should parse an object with indirect context values', () => {
         return expect(parser.parse({ "@context": { name: "http://xmlns.com/foaf/0.1/name" } })).resolves