✅ Add triangle test

Author: UltiRequiem

src/language/triangle.test.ts

@@ -0,0 +1,18 @@
+import { triangle, triangleFor } from "./triangle.ts";
+import { assertEquals } from "../../deps.ts";
+
+const expected = `#
+##
+###`;
+
+Deno.test("[triangle]", () => {
+  assertEquals(triangle(), expected);
+});
+
+Deno.test("[triangleFor]", () => {
+  assertEquals(triangleFor(), expected);
+});
+
+Deno.test("[triangle vs triangleFor]", () => {
+  assertEquals(triangle(), triangleFor());
+});

src/language/triangle.ts

@@ -9,5 +9,7 @@ export function triangleFor(rows = 3) {
     result += "#".repeat(i) + "\n";
   }
 
+  result = result.slice(0, -1);
+
   return result;
 }