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deno.json

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+{
+  "tasks": {
+    "dev": "deno run --watch main.ts"
+  },
+  "imports": {
+    "@std/assert": "jsr:@std/assert@1"
+  }
+}

main.ts

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+// rndhex - main.ts
+import { bold, rgb24 } from "https://deno.land/[email protected]/fmt/colors.ts";
+
+// Function to generate a random hex color code
+export function getRandomHexCode(): string {
+  const randomInt = Math.floor(Math.random() * 0xffffff);
+  return `#${randomInt.toString(16).padStart(6, '0')}`;
+}
+
+// Function to print a square of hashtags with the background color
+export function printColoredSquare(hex: string) {
+  const r = parseInt(hex.substring(1, 3), 16);
+  const g = parseInt(hex.substring(3, 5), 16);
+  const b = parseInt(hex.substring(5, 7), 16);
+
+  // Print a 3x3 square with the background color
+  const square = `###\n###\n###`;
+  console.log(rgb24(bold(square), { r, g, b }));
+}
+
+const hexCode = getRandomHexCode();
+console.log(hexCode);  // Print the random hex code
+printColoredSquare(hexCode);  // Print the square with the hex color

main_test.ts

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+// rndhex - main_test.ts
+import { assertMatch } from "https://deno.land/[email protected]/assert/mod.ts";
+import { getRandomHexCode, printColoredSquare } from "./main.ts";
+
+// Test for generating a random hex code
+Deno.test("Random Hex Code Generation", () => {
+  const hexCode = getRandomHexCode();
+
+  // Check that the hex code matches the pattern for a valid hex color code
+  const hexPattern = /^#[0-9a-fA-F]{6}$/;
+  assertMatch(hexCode, hexPattern, `Generated hex code (${hexCode}) is not valid`);
+});
+
+// Mock the console output to test the square printing
+Deno.test("Print Colored Square Format", () => {
+  const hexCode = "#ffffff"; // Example hex code to test
+
+  // Capture the console output
+  const originalConsoleLog = console.log;
+  let consoleOutput = "";
+  console.log = (output: string) => {
+    consoleOutput += output + "\n";
+  };
+
+  try {
+    // Call the function to print the colored square
+    printColoredSquare(hexCode);
+
+    // Check that the output contains the square format
+    const squarePattern = /###\n###\n###/;
+    assertMatch(consoleOutput, squarePattern, "Square format not found in output");
+  } finally {
+    // Restore the original console.log
+    console.log = originalConsoleLog;
+  }
+});