1 files changed, 37 insertions, 0 deletions
diff --git a/tst/collections_jsonds.test.ts b/tst/collections_jsonds.test.ts
new file mode 100644
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+++ b/tst/collections_jsonds.test.ts
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+import { JSONHashMap, JSONSet } from '../lib/index';
+
+describe('types/collections/jsonds', () => {
+    test('JSONSet uses stable JSON identity', () => {
+        const set = new JSONSet<{ a: number; b: number }>();
+        set.add({ a: 1, b: 2 });
+
+        expect(set.has({ b: 2, a: 1 })).toBe(true);
+        expect(set.size()).toBe(1);
+
+        expect(set.delete({ b: 2, a: 1 })).toBe(true);
+        expect(set.has({ a: 1, b: 2 })).toBe(false);
+
+        set.add({ a: 1, b: 2 });
+        set.clear();
+        expect(set.size()).toBe(0);
+    });
+
+    test('JSONHashMap stable keying and keys()', () => {
+        const map = new JSONHashMap<{ a: number; b: number }, { v: string }>();
+
+        map.set({ a: 1, b: 2 }, { v: 'x' });
+        expect(map.get({ b: 2, a: 1 })).toEqual({ v: 'x' });
+        expect(map.has({ b: 2, a: 1 })).toBe(true);
+        expect(map.size()).toBe(1);
+
+        const keys = map.keys();
+        expect(keys).toEqual([{ a: 1, b: 2 }]);
+
+        expect(map.delete({ b: 2, a: 1 })).toBe(true);
+        expect(map.size()).toBe(0);
+
+        map.set({ a: 1, b: 2 }, { v: 'x' });
+        map.clear();
+        expect(map.size()).toBe(0);
+    });
+});