re-added the newline, as well as another test case to make sure mode is still set to default value when a new file is opened

src/filesystem/implementation.js

@@ -1930,6 +1930,7 @@ function validateAndMaskMode(value, def, callback) {
     callback = def;
     def = undefined;
   }
+  
   if (isUint32(value)) {
     return value & FULL_READ_WRITE_EXEC_PERMISSIONS;
   }

tests/spec/fs.open.spec.js

@@ -123,6 +123,22 @@ describe('fs.open', function() {
     });
   });
 
+  it('should create a new file, but no mode is passed, so  the default value of 644 should be seen', function(done) {
+
+    var fs = util.fs();
+    fs.open('/myfile', 'w', function(error) {
+      if(error) throw error;
+
+      fs.stat('/myfile', function(error, result) {
+        expect(error).not.to.exist;
+        expect(result).to.exist;
+        expect(result.mode).to.exist;
+        expect(result.mode & 0o644).to.equal(0o644);
+        done();
+      });
+    });
+  });
+
   /**
    * This test is currently correct per our code, but incorrect according to the spec.
    * When we fix https://github.com/filerjs/filer/issues/314 we'll have to update this.