test(core): add ref tests

packages/core/test/ref.test.ts

@@ -0,0 +1,45 @@
+import { query, edge } from '../src';
+import { uid } from '../src/operators';
+
+// does not test formatting
+describe('Ref test', () => {
+  it('another query uid', () => {
+    const q1 = query().func(uid('0x2'));
+    const q2 = query()
+      .func(uid(q1))
+      .filter(uid(q1))
+      .project({
+        id: 1,
+        name: 1,
+      });
+    const qStr = q2.build().toString();
+
+    expect(qStr).toMatch(/v1 as var\(func: uid\(0x2\)\)/);
+    expect(qStr).toMatch(/q1\(func: uid\(v1\)\)/);
+  });
+
+  it('another query nested uid', () => {
+    const q1 = query()
+      .func(uid('0x2'))
+      .project({
+        posts: edge({}).filter(uid('0x3', '0x4', '0x5')),
+      });
+
+    const q2 = query()
+      .func(uid(q1))
+      .project({
+        id: 1,
+        name: 1,
+        posts: edge({
+            id: 1,
+          })
+          .filter(uid(q1.ref('posts'))),
+      });
+    const qStr = q2.build().toString();
+
+    expect(qStr).toMatch(/v2 as var\(func: uid\(0x2\)\)/);
+    expect(qStr).toMatch(/v1 as posts @filter\(uid\(0x3, 0x4, 0x5\)\)/);
+    expect(qStr).toMatch(/q1\(func: uid\(v2\)\)/);
+    expect(qStr).toMatch(/posts @filter\(uid\(v1\)\)/);
+  });
+});