Fix #394: unitless-zero vs fractions

Don't remove units from values starting from zero, like `0.5em`

Author: tonyganch

lib/options/unitless-zero.js

@@ -21,13 +21,13 @@ module.exports = {
 
                 if (value.is('dimension')) {
                     var unit = value.first('ident').content;
-                    if (value.first('number').content[0] === '0' &&
+                    if (value.first('number').content === '0' &&
                         UNITS.indexOf(unit) !== -1) {
                         value.remove(1);
                     }
                 } else if (value.is('percentage')) {
                     var number = value.first('number').content;
-                    if (number[0] === '0') {
+                    if (number === '0') {
                         value.type = 'number';
                         value.content = number;
                     }
@@ -54,7 +54,7 @@ module.exports = {
             }
 
             if (node.is('dimension') &&
-                node.first('number').content[0] === '0' &&
+                node.first('number').content === '0' &&
                 node.first('ident').content !== 'deg') {
                 detected.push(false);
                 return;
@@ -63,7 +63,7 @@ module.exports = {
             // If we see a zero and previous node is not percentage
             // or dimension, then we have an option
             if (node.is('number') &&
-                node.content[0] === '0' &&
+                node.content === '0' &&
                 !parent.is('percentage') &&
                 !parent.is('dimension')) {
                 detected.push(true);

src/options/unitless-zero.js

@@ -0,0 +1,6 @@
+.example {
+  bottom: 0em;
+  left:   0.5em;
+  right:  1em;
+  top:    1.5em;
+}

test/options/unitless-zero/issue-394.css

@@ -0,0 +1,6 @@
+.example {
+  bottom: 0;
+  left:   0.5em;
+  right:  1em;
+  top:    1.5em;
+}

test/options/unitless-zero/issue-394.expected.css

@@ -37,6 +37,11 @@ describe('options/unitless-zero', function() {
                 assert.equal(actual, 'div { -webkit-transform: rotate(0deg); }');
             });
         });
+
+        it('Issue 394', function() {
+            this.comb.configure({ 'unitless-zero': true });
+            this.shouldBeEqual('issue-394.css', 'issue-394.expected.css');
+        });
     });
 
     describe('detect', function() {
@@ -50,6 +55,7 @@ describe('options/unitless-zero', function() {
             );
         });
 
+
         it('Should detect zero with unit', function() {
             this.shouldDetect(
                 ['unitless-zero'],