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test/pseudo-tty/test-assert-position-indicator.js

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+'use strict';
+require('../common');
+const assert = require('assert');
+
+process.env.NODE_DISABLE_COLORS = '1';
+
+// Does not show the indicator when the terminal is too narrow
+process.stderr.columns = 20;
+
+assert.throws(
+  () => { assert.strictEqual('123456789ABCDEFGHI', '1!3!5!7!9!BC!!!GHI'); },
+  (err) => !err.message.includes('^'),
+);
+
+// Does not show the indicator because the first difference is in the first 2 chars
+process.stderr.columns = 80;
+assert.throws(
+  () => { assert.strictEqual('123456789ABCDEFGHI', '1!3!5!7!9!BC!!!GHI'); },
+  {
+    message: 'Expected values to be strictly equal:\n' +
+      '+ actual - expected\n' +
+      '\n' +
+      "+ '123456789ABCDEFGHI'\n" +
+      "- '1!3!5!7!9!BC!!!GHI'\n",
+  },
+);
+
+// Show the indicator because the first difference is in the 3 char
+process.stderr.columns = 80;
+assert.throws(
+  () => { assert.strictEqual('123456789ABCDEFGHI', '12!!5!7!9!BC!!!GHI'); },
+  {
+    message: 'Expected values to be strictly equal:\n' +
+      '+ actual - expected\n' +
+      '\n' +
+      "+ '123456789ABCDEFGHI'\n" +
+      "- '12!!5!7!9!BC!!!GHI'\n" +
+      '     ^\n',
+  },
+);