add tests for tuple key type

test/types/TupleKeyTests.test.ts

@@ -0,0 +1,18 @@
+import { describe, expect, it } from "@jest/globals";
+import { TupleKey } from "../../src/types/TupleKey";
+
+describe("TupleKey", () => {
+  it("stores a value copy of the original tuple", () => {
+    const tuple: [string, string] = ["150", "539"];
+    const tupleKey = new TupleKey(...tuple);
+
+    expect(tupleKey.tuple).toEqual(tuple);
+  });
+
+  it("returns a string representation of itself", () => {
+    const tuple: [string, string] = ["150", "539"];
+    const tupleKey = new TupleKey(...tuple);
+
+    expect(`${tupleKey}`).toEqual("150|539");
+  });
+});