Add sumBy tests.

test/test.js

@@ -20389,47 +20389,6 @@
 
   /*--------------------------------------------------------------------------*/
 
-  QUnit.module('lodash.sum');
-
-  (function() {
-    var array = [6, 4, 2];
-
-    QUnit.test('should return the sum of an array of numbers', function(assert) {
-      assert.expect(1);
-
-      assert.strictEqual(_.sum(array), 12);
-    });
-
-    QUnit.test('should return `0` when passing empty `array` values', function(assert) {
-      assert.expect(1);
-
-      var expected = lodashStable.map(empties, alwaysZero),
-          actual = lodashStable.map(empties, _.sum);
-
-      assert.deepEqual(actual, expected);
-    });
-
-    QUnit.test('should skip `undefined` values', function(assert) {
-      assert.expect(1);
-
-      assert.strictEqual(_.sum([1, undefined]), 1);
-    });
-
-    QUnit.test('should not skip `NaN` values', function(assert) {
-      assert.expect(1);
-
-      assert.deepEqual(_.sum([1, NaN]), NaN);
-    });
-
-    QUnit.test('should not coerce values to numbers', function(assert) {
-      assert.expect(1);
-
-      assert.strictEqual(_.sum(['1', '2']), '12');
-    });
-  }());
-
-  /*--------------------------------------------------------------------------*/
-
   QUnit.module('lodash.sumBy');
 
   (function() {
@@ -20469,6 +20428,51 @@
 
   /*--------------------------------------------------------------------------*/
 
+  QUnit.module('sum methods');
+
+  lodashStable.each(['sum', 'sumBy'], function(methodName) {
+    var array = [6, 4, 2],
+        func = _[methodName];
+
+    QUnit.test('`_.' + methodName + '` should return the sum of an array of numbers', function(assert) {
+      assert.expect(1);
+
+      assert.strictEqual(func(array), 12);
+    });
+
+    QUnit.test('`_.' + methodName + '` should return `0` when passing empty `array` values', function(assert) {
+      assert.expect(1);
+
+      var expected = lodashStable.map(empties, alwaysZero);
+
+      var actual = lodashStable.map(empties, function(value) {
+        return func(value);
+      });
+
+      assert.deepEqual(actual, expected);
+    });
+
+    QUnit.test('`_.' + methodName + '` should skip `undefined` values', function(assert) {
+      assert.expect(1);
+
+      assert.strictEqual(func([1, undefined]), 1);
+    });
+
+    QUnit.test('`_.' + methodName + '` should not skip `NaN` values', function(assert) {
+      assert.expect(1);
+
+      assert.deepEqual(func([1, NaN]), NaN);
+    });
+
+    QUnit.test('`_.' + methodName + '` should not coerce values to numbers', function(assert) {
+      assert.expect(1);
+
+      assert.strictEqual(func(['1', '2']), '12');
+    });
+  });
+
+  /*--------------------------------------------------------------------------*/
+
   QUnit.module('lodash.tail');
 
   (function() {