add @page tests

Author: tj

Makefile

@@ -2,6 +2,7 @@
 test:
 	@./node_modules/.bin/mocha \
 		--require should \
-		--reporter spec
+		--reporter spec \
+		--bail
 
-.PHONY: test
+.PHONY: test

index.js

@@ -167,8 +167,12 @@ Compiler.prototype.keyframe = function(node){
  */
 
 Compiler.prototype.page = function(node){
-  return '@page ' + node.selectors.join(', ')
-    + ' {\n'
+  var sel = node.selectors.length
+    ? node.selectors.join(', ') + ' '
+    : '';
+
+  return '@page ' + sel
+    + '{\n'
     + this.indent(1)
     + node.declarations.map(this.visit, this).join('\n')
     + this.indent(-1)

test/cases/page.css

@@ -0,0 +1,15 @@
+@page {
+  margin: 2.5cm;
+}
+
+@page :left {
+  margin-left: 5cm;
+}
+
+@page :right {
+  margin-right: 5cm;
+}
+
+@page :first {
+  margin-top: 8cm;
+}