Add test for Number.prototype.chr goody

workspaces/adventure-pack/goodies/typescript/Number.prototype.chr/index.test.ts

@@ -0,0 +1,54 @@
+import { describe, expect, it } from "@jest/globals";
+
+import "./index";
+
+describe("Number.prototype.chr", () => {
+  it("convert ASCII codepoint to ASCII string", () => {
+    expect(Number(65).chr()).toBe("A");
+    expect(Number(10).chr()).toBe("\n");
+    expect(Number(61).chr()).toBe("=");
+    expect(Number(126).chr()).toBe("~");
+    expect(Number(32).chr()).toBe(" ");
+    expect(Number(48).chr()).toBe("0");
+  });
+
+  it("convert codepoint to emoji", () => {
+    expect(Number(129302).chr()).toBe("🤖");
+    expect(Number(129412).chr()).toBe("🦄");
+  });
+
+  it("convert hex codepoint to string", () => {
+    expect(Number(0x404).chr()).toBe("Є");
+    expect(Number(0x24).chr()).toBe("$");
+    expect(Number(0x1f303).chr()).toBe("🌃");
+    expect(Number(0x1f92a).chr()).toBe("🤪");
+  });
+
+  it("convert empty coercions to null character", () => {
+    expect(Number().chr()).toBe("\0");
+    expect(Number([]).chr()).toBe("\0");
+    expect(Number("").chr()).toBe("\0");
+    expect(Number(0).chr()).toBe("\0");
+    expect(Number(false).chr()).toBe("\0");
+    expect(Number(null).chr()).toBe("\0");
+  });
+
+  it("handle numbers outside unicode range by throwing range error", () => {
+    expect(() => Number(-1).chr()).toThrow(RangeError);
+    expect(() => Number(11120651).chr()).toThrow(RangeError);
+    expect(() => Number(Infinity).chr()).toThrow(RangeError);
+    expect(() => Number(-Infinity).chr()).toThrow(RangeError);
+    expect(() => Number("_").chr()).toThrow(RangeError);
+    expect(() => Number(1.5).chr()).toThrow(RangeError);
+    expect(() => Number(1e-2).chr()).toThrow(RangeError);
+    expect(() => Number(0xffffff).chr()).toThrow(RangeError);
+  });
+
+  it("handles incompatible types by throwing range error", () => {
+    expect(() => Number(undefined).chr()).toThrow(RangeError);
+    expect(() => Number(NaN).chr()).toThrow(RangeError);
+    expect(() => Number([1, 2]).chr()).toThrow(RangeError);
+    expect(() => Number("65,55").chr()).toThrow(RangeError);
+    expect(() => Number({}).chr()).toThrow(RangeError);
+  });
+});