test: improve test-abort-backtrace

Improve error message by showing output when frames output does not meet
expectations.

Since we can't tell at runtime if we have the correct libc for
backtraces, allow an empty backtrace and run the test on all platforms.

PR-URL: nodejs/node#14013
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>

test/abort/test-abort-backtrace.js

@@ -10,13 +10,19 @@ if (process.argv[2] === 'child') {
   process.abort();
 } else {
   const child = cp.spawnSync(`${process.execPath}`, [`${__filename}`, 'child']);
-  const frames =
-      child.stderr.toString().trimRight().split('\n').map((s) => s.trim());
+  const stderr = child.stderr.toString();
 
   assert.strictEqual(child.stdout.toString(), '');
-  assert.ok(frames.length > 0);
-  // All frames should start with a frame number.
-  assert.ok(frames.every((frame, index) => frame.startsWith(`${index + 1}:`)));
-  // At least some of the frames should include the binary name.
-  assert.ok(frames.some((frame) => frame.includes(`[${process.execPath}]`)));
+  // stderr will be empty for systems that don't support backtraces.
+  if (stderr !== '') {
+    const frames = stderr.trimRight().split('\n').map((s) => s.trim());
+
+    if (!frames.every((frame, index) => frame.startsWith(`${index + 1}:`))) {
+      assert.fail(`Each frame should start with a frame number:\n${stderr}`);
+    }
+
+    if (!frames.some((frame) => frame.includes(`[${process.execPath}]`))) {
+      assert.fail(`Some frames should include the binary name:\n${stderr}`);
+    }
+  }
 }