Fixed: zero values are not unitless anymore (#11)

Browsers do not calculate calc() with 0 unitless values http://jsbin.com/punivivipo/edit?html,css,output

Author: dennisfrank

index.js

@@ -89,10 +89,8 @@ function reduceCSSCalc(value, decimalPrecision) {
       result = Math.round(result * decimalPrecision) / decimalPrecision
     }
 
-    // We don't need units for zero values...
-    if (result !== 0) {
-      result += unit
-    }
+    // Add unit
+    result += unit
 
     return result
   }

test/index.js

@@ -59,6 +59,7 @@ test("reduce complexe css calc()", function(t) {
   t.equal(reduceCSSCalc("calc((2 * 100) / 12)"), reduceCSSCalc("calc((100 / 12) * 2)"), "indentical, wrong rounded")
   t.equal(reduceCSSCalc("calc((2 * 100) / 12)", 3), "16.667", "indentical rounded with options")
   t.equal(reduceCSSCalc("calc((100 / 12) * 2)", 3), "16.667", "indentical rounded with options")
+  t.equal(reduceCSSCalc("calc(50% - 50vw + (100vw - 100vw) / 2 + 1em)"), "calc(50% - 50vw + 0vw / 2 + 1em)", "keep units for zero values")
   t.end()
 })