ref to build 15774801

src/coffee/spec/unit/helpers/underscore_mixin_spec.coffee

@@ -8,5 +8,19 @@ define ['app/helpers/underscore_mixin'], (_)->
 		it 'isUsable mixin', ()->
 			expect(_.isUsable).to.be.a('function')
 
+			_.isUsable(null).should.be.false
+			_.isUsable(undefined).should.be.false
+			_.isUsable("").should.be.false
+			_.isUsable({}).should.be.true
+			_.isUsable("titi").should.be.true
+
 		it 'usable mixin', ()->
-			expect(_.usable).to.be.a('function')
+			expect(_.usable).to.be.a('function')
+
+			_.usable(null, 'default').should.be.equal 'default'
+			expect(_.usable(null, null)).to.be.null
+			expect(_.usable(null, undefined)).to.be.null
+			expect(_.usable(null, "")).to.be.null
+			_.usable(undefined, 'default').should.be.equal 'default'
+			_.usable("", 'default').should.be.equal 'default'
+			_.usable("titi").should.be.equal 'titi'