feat(utxo-bin): add utility for capturing console output in tests

Add helper function to capture stdout/stderr during test execution to make
assertions on console output. Includes disabling colors for reliable tests.

Issue: BTC-2170

Co-authored-by: llm-git <[email protected]>

Author: OttoAllmendinger

modules/utxo-bin/test/captureConsole.ts

@@ -0,0 +1,36 @@
+import * as util from 'node:util';
+
+export async function captureConsole<T>(
+  func: () => Promise<T>
+): Promise<{ stdout: string; stderr: string; result: T }> {
+  process.env.NO_COLOR = '1'; // Disable colors in console output for easier testing
+  const oldConsoleLog = console.log;
+  const oldConsoleError = console.error;
+
+  const stdoutData: string[] = [];
+  const stderrData: string[] = [];
+
+  console.log = (...args: any[]) => {
+    stdoutData.push(util.format(...args));
+  };
+
+  console.error = (...args: any[]) => {
+    stderrData.push(util.format(...args));
+  };
+
+  let result: T;
+  try {
+    result = await func();
+  } finally {
+    console.log = oldConsoleLog;
+    console.error = oldConsoleError;
+  }
+
+  const join = (data: string[]) => (data.length > 0 ? data.join('\n') + '\n' : '');
+
+  return {
+    stdout: join(stdoutData),
+    stderr: join(stderrData),
+    result,
+  };
+}