1 files changed, 46 insertions, 0 deletions
diff --git a/node_modules/is-error/test/index.js b/node_modules/is-error/test/index.js
new file mode 100644
index 000000000..e20a2f719
--- /dev/null
+++ b/node_modules/is-error/test/index.js
@@ -0,0 +1,46 @@
+'use strict';
+
+var test = require('tape');
+var vm = require('vm');
+
+var isError = require('../index.js');
+
+test('isError is a function', function t(assert) {
+    assert.equal(typeof isError, 'function');
+    assert.end();
+});
+
+test('returns true for error', function t(assert) {
+    assert.equal(isError(new Error('foo')), true);
+    assert.equal(isError(Error('foo')), true);
+    assert.end();
+});
+
+test('returns false for non-error', function t(assert) {
+    assert.equal(isError(null), false);
+    assert.equal(isError(undefined), false);
+    assert.equal(isError({message: 'hi'}), false);
+    assert.equal(isError(true), false);
+    assert.equal(isError(false), false);
+    assert.equal(isError(1), false);
+    assert.equal(isError('string'), false);
+    assert.end();
+});
+
+test('errors that inherit from Error', function t(assert) {
+    var error = Object.create(new Error());
+    assert.equal(isError(error), true);
+    assert.end();
+});
+
+test('errors from other contexts', function t(assert) {
+    var error = vm.runInNewContext('new Error()');
+    assert.equal(isError(error), true);
+    assert.end();
+});
+
+test('errors that inherit from Error in another context', function t(assert) {
+    var error = vm.runInNewContext('Object.create(new Error())');
+    assert.equal(isError(error), true);
+    assert.end();
+});