1 files changed, 135 insertions, 0 deletions
diff --git a/tests/js/utils.js b/tests/js/utils.js
new file mode 100644
index 0000000..1ecc0a4
--- /dev/null
+++ b/tests/js/utils.js
@@ -0,0 +1,135 @@
+import { eq, keys } from "../../src/utils.js";
+
+const test_eq = t => {
+	t.start("eq()");
+	t.test("scalar values equality", () => {
+		t.assert(eq(0, 0));
+		t.assert(eq(100, 100));
+		t.assert(eq(1.5, 1.5));
+		t.assert(eq(-9, -9));
+
+		t.assert(!eq(0, 1));
+		t.assert(!eq(100, 99));
+		t.assert(!eq(1.5, 1.4));
+		t.assert(!eq(-9, 9));
+
+
+		t.assert(eq(null, null));
+		t.assert(eq(undefined, undefined));
+		t.assert(eq("", ""));
+		t.assert(eq("a string", "a string"));
+
+		t.assert(!eq(null, undefined));
+		t.assert(!eq(undefined, 0));
+		t.assert(!eq("", "0"));
+		t.assert(!eq("a string", "another string"));
+
+
+		t.assert(eq(true, true));
+		t.assert(eq(false, false));
+
+		t.assert(!eq(true, false));
+
+
+		t.assert(eq(1n, 1n));
+		t.assert(eq(99999999999999n, 99999999999999n));
+
+		// t.assert(eq(1, 1n));
+	});
+
+	t.test("array equality", () => {
+		t.assert(eq([], []));
+
+
+		t.assert(eq([0, 1, 2], [0, 1, 2]));
+		t.assert(eq([0, 1, 2], new Array(0, 1, 2)));
+
+		t.assert(!eq([0, 1, 2], [0, 1]));
+		t.assert(!eq([0, 1], new Array(0, 1, 2)));
+
+
+		t.assert(eq([undefined], [undefined]));
+		t.assert(eq([null, 0, "", true], [null, 0, "", true]));
+
+
+		t.assert(eq([[[[0]]]], [[[[0]]]]));
+
+		t.assert(!eq([[[[0]]]], [0]));
+	});
+
+	t.test("object equality", () => {
+		t.assert(eq({}, {}));
+		t.assert(eq({ a: 1 }, { a: 1 }));
+
+		t.assert(!eq({ a: 1, b: undefined }, { a: 1 }));
+
+
+		t.assert(eq(
+			{ a: 1, b: { c: { d: "e" } } },
+			{ a: 1, b: { c: { d: "e" } } },
+		));
+
+		class C {}
+		// ...
+	});
+
+	t.test("mixed values", () => {
+		t.assert(eq(
+			{a: ["", 1, 2, 3, [{ b: { c: [ "d", "e" ]}}]]},
+			{a: ["", 1, 2, 3, [{ b: { c: [ "d", "e" ]}}]]},
+		));
+
+		t.assert(!eq(null, {}));
+
+		t.assert(!eq([], {}));
+
+
+		t.assert(eq(new Date(123), new Date(123)));
+		t.assert(eq({ d: new Date(123) }, { d: new Date(123) }));
+
+		// FIXME
+		// t.assert(!eq(new Date(123), new Date(321)));
+		// t.assert(!eq({ d: new Date(123) }, { d: new Date(321) }));
+	});
+};
+
+const test_keys = t => {
+	t.start("keys()");
+	t.test("happy paths", () => {
+		t.assertEq(
+			{ a: 1, b: 2 },
+			keys(["a", "b"], { a: 1, b: 2, c: 3 }),
+		);
+	});
+
+	t.test("stress scenarios", () => {
+		t.assertEq(
+			{},
+			keys([], {}),
+			"empty selection of empty object",
+		);
+
+		t.assertEq(
+			{},
+			keys([], {a: 1}),
+			"empty selection of non-empty object",
+		);
+
+		t.assertEq(
+			{},
+			keys(["a"], {}),
+			"non-empty selection of empty object",
+		);
+
+		t.assertEq(
+			{ a: undefined, b: null },
+			keys(["a", "b", "c"], { a: undefined, b: null }),
+			"falsy values",
+		);
+	});
+};
+
+export const tests = [
+	test_eq,
+	test_keys,
+];