test: add a test for passing Arrays to a native addon function

See #8.

test/array.js

@@ -185,7 +185,21 @@ describe('Array', function () {
       assert.equal(y[0], x[1])
       assert.equal(y[1], x[2])
       assert.equal(y[2], x[3])
-    }) 
+    })
+  })
+
+  describe('native tests', function () {
+    var IntArray = ArrayType('int')
+
+    it('should be pass an Array to a native function', function () {
+      var input = [-1, -25, -3111, -41234, -5]
+      var array = new IntArray(input)
+
+      bindings.arrayAbs(array.buffer, array.length)
+
+      assert.deepEqual(array.toJSON(), input.map(Math.abs));
+    })
+
   })
 
 })

test/native_tests.cc

@@ -1,13 +1,22 @@
 #include <stdlib.h>
+#include <stdlib.h>  /* abs */
 #include "nan.h"
 
 using namespace node;
 
 namespace {
 
+NAN_METHOD(ArrayAbs) {
+  int *arr = reinterpret_cast<int *>(Buffer::Data(info[0].As<v8::Object>()));
+  uint32_t length = info[1]->Uint32Value();
+  for (uint32_t i = 0; i < length; i++) {
+    *(arr + i) = abs(arr[i]);
+  }
+}
+
 void Initialize(v8::Handle<v8::Object> target) {
   Nan::HandleScope scope;
-
+  Nan::SetMethod(target, "arrayAbs", ArrayAbs);
 }
 
 } // anonymous namespace