Fix tests for the npm build.

test/test.js

@@ -11739,6 +11739,7 @@
 
   (function() {
     test('should remove elements from the end of `array`', 4, function() {
+      if (!isNpm) {
         var wrapped = _([1, 2]);
 
         strictEqual(wrapped.pop(), 2);
@@ -11746,6 +11747,10 @@
 
         strictEqual(wrapped.pop(), 1);
         deepEqual(wrapped.value(), []);
+      }
+      else {
+        skipTest(4);
+      }
     });
   }());
 
@@ -11755,6 +11760,7 @@
 
   (function() {
     test('should remove elements from the front of `array`', 4, function() {
+      if (!isNpm) {
         var wrapped = _([1, 2]);
 
         strictEqual(wrapped.shift(), 1);
@@ -11762,6 +11768,10 @@
 
         strictEqual(wrapped.shift(), 2);
         deepEqual(wrapped.value(), []);
+      }
+      else {
+        skipTest(4);
+      }
     });
   }());
 
@@ -11771,6 +11781,7 @@
 
   (function() {
     test('should support removing and inserting elements', 4, function() {
+      if (!isNpm) {
         var wrapped = _([1, 2]);
 
         deepEqual(wrapped.splice(1, 1, 3).value(), [2]);
@@ -11778,6 +11789,10 @@
 
         deepEqual(wrapped.splice(0, 2).value(), [1, 3]);
         deepEqual(wrapped.value(), []);
+      }
+      else {
+        skipTest(4);
+      }
     });
   }());