feature(for-each-key) add

test/common/for-each-key.spec.js

@@ -0,0 +1,49 @@
+'use strict';
+
+const test = require('tape');
+const diff = require('sinon-called-with-diff');
+const sinon = diff(require('sinon'));
+
+const forEachKey = require('../../common/for-each-key');
+
+test('forEachKey: on property', (t) => {
+    const obj = {
+        a: 'hello',
+    };
+    
+    const fn = sinon.stub();
+    
+    forEachKey(fn, obj);
+    
+    t.ok(fn.calledWith('a', 'hello'), 'should call fn');
+    t.end();
+});
+
+test('forEachKey: a couple properties', (t) => {
+    const obj = {
+        a: 'hello',
+        b: 'world',
+    };
+    
+    const fn = sinon.stub();
+    
+    forEachKey(fn, obj);
+    
+    t.ok(fn.calledWith('b', 'world'), 'should call fn');
+    t.end();
+});
+
+test('forEachKey: count', (t) => {
+    const obj = {
+        a: 'hello',
+        b: 'world',
+        c: 'some',
+    };
+    
+    const fn = sinon.stub();
+    
+    forEachKey(fn, obj);
+    
+    t.equal(fn.callCount, 3, 'should ');
+    t.end();
+});