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qwen/nodejs/node_modules/object-inspect/test/fn.js

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+var inspect = require('../');
+var test = require('tape');
+var arrow = require('make-arrow-function')();
+var functionsHaveConfigurableNames = require('functions-have-names').functionsHaveConfigurableNames();
+
+test('function', function (t) {
+    t.plan(1);
+    var obj = [1, 2, function f(n) { return n; }, 4];
+    t.equal(inspect(obj), '[ 1, 2, [Function: f], 4 ]');
+});
+
+test('function name', function (t) {
+    t.plan(1);
+    var f = (function () {
+        return function () {};
+    }());
+    f.toString = function toStr() { return 'function xxx () {}'; };
+    var obj = [1, 2, f, 4];
+    t.equal(inspect(obj), '[ 1, 2, [Function (anonymous)] { toString: [Function: toStr] }, 4 ]');
+});
+
+test('anon function', function (t) {
+    var f = (function () {
+        return function () {};
+    }());
+    var obj = [1, 2, f, 4];
+    t.equal(inspect(obj), '[ 1, 2, [Function (anonymous)], 4 ]');
+
+    t.end();
+});
+
+test('arrow function', { skip: !arrow }, function (t) {
+    t.equal(inspect(arrow), '[Function (anonymous)]');
+
+    t.end();
+});
+
+test('truly nameless function', { skip: !arrow || !functionsHaveConfigurableNames }, function (t) {
+    function f() {}
+    Object.defineProperty(f, 'name', { value: false });
+    t.equal(f.name, false);
+    t.equal(
+        inspect(f),
+        '[Function: f]',
+        'named function with falsy `.name` does not hide its original name'
+    );
+
+    function g() {}
+    Object.defineProperty(g, 'name', { value: true });
+    t.equal(g.name, true);
+    t.equal(
+        inspect(g),
+        '[Function: true]',
+        'named function with truthy `.name` hides its original name'
+    );
+
+    var anon = function () {}; // eslint-disable-line func-style
+    Object.defineProperty(anon, 'name', { value: null });
+    t.equal(anon.name, null);
+    t.equal(
+        inspect(anon),
+        '[Function (anonymous)]',
+        'anon function with falsy `.name` does not hide its anonymity'
+    );
+
+    var anon2 = function () {}; // eslint-disable-line func-style
+    Object.defineProperty(anon2, 'name', { value: 1 });
+    t.equal(anon2.name, 1);
+    t.equal(
+        inspect(anon2),
+        '[Function: 1]',
+        'anon function with truthy `.name` hides its anonymity'
+    );
+
+    t.end();
+});