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node_modules/stack-chain/test/simple/conflict-format-delayed-circular.js

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+
+var test = require("tap").test;
+var defaultFormater = require('../../format.js');
+var produce = require('../produce.js');
+
+var chain = require('../../');
+
+test("set Error.prepareStackTrace uses stack-chain formater", function (t) {
+  // Save original formatter
+  var restore = Error.prepareStackTrace;
+
+  // Overwrite formatter
+  Error.prepareStackTrace = function (error, frames) {
+    if (error.test) {
+      Object.defineProperty(error, '__some_secret', {
+        value: 'you can\'t compare pain.'
+      });
+    }
+
+    // Maintain .stack format
+    return restore(error, frames);
+  };
+
+  // Prope the error using custom prepareStackTrace
+  var testError = new Error();
+  testError.test = true;
+  testError.stack;
+  t.equal(testError.__some_secret, 'you can\'t compare pain.');
+
+  // Restore
+  Error.prepareStackTrace = restore;
+
+  t.equal(produce.real(3), produce.fake([
+    'Error: trace',
+    '    at {where}:18:17',
+    '    at deepStack ({where}:5:5)',
+    '    at deepStack ({where}:7:5)'
+  ]));
+
+  t.end();
+});
+
+test("set Error.prepareStackTrace uses other formater", function (t) {
+  // Another module sets up a formater
+  Error.prepareStackTrace = function () {
+    return 'custom';
+  };
+
+  // Save original formatter
+  var restore = Error.prepareStackTrace;
+
+  // Overwrite formatter
+  Error.prepareStackTrace = function (error, frames) {
+    if (error.test) {
+      Object.defineProperty(error, '__some_secret', {
+        value: 'you can\'t compare pain.'
+      });
+    }
+
+    // Maintain .stack format
+    return restore(error, frames);
+  };
+
+  // Prope the error using custom prepareStackTrace
+  var testError = new Error();
+  testError.test = true;
+  testError.stack;
+  t.equal(testError.__some_secret, 'you can\'t compare pain.');
+
+  // Restore
+  Error.prepareStackTrace = restore;
+
+  t.equal(produce.real(3), 'custom');
+
+  // Perform an actual restore of the formater, to prevent test conflicts
+  chain.format.restore();
+
+  t.equal(produce.real(3), produce.fake([
+    'Error: trace',
+    '    at {where}:18:17',
+    '    at deepStack ({where}:5:5)',
+    '    at deepStack ({where}:7:5)'
+  ]));
+
+  t.end();
+});