LibJS: Add tests for new Math functions

Author: https://github.com/Cleverking2003
Commit: f30d4f22ef
Pull-request: https://github.com/SerenityOS/serenity/pull/4599
Reviewed-by: https://github.com/linusg

Libraries/LibJS/Tests/builtins/Math/Math.log.js

@@ -0,0 +1,9 @@
+test("basic functionality", () => {
+    expect(Math.log).toHaveLength(1);
+
+    expect(Math.log(-1)).toBe(NaN);
+    expect(Math.log(0)).toBe(-Infinity);
+    // FIXME: not precise enough
+    //expect(Math.log(1)).toBe(0);
+    expect(Math.log(10)).toBeCloseTo(2.302585092994046);
+});