Add specs for Rivets.TextTemplateParser against some predefined templates and ex…

…pected tokens. [#181]

+describe("Rivets.TextTemplateParser", function() {
+  var Rivets = rivets._
+
+  describe("parse()", function() {
+    it("tokenizes a text template", function() {
+      template = "Hello {{ user.name }}, you have {{ user.messages.unread | length }} unread messages."
+
+      expected = [
+        {type: 0, value: "Hello "},
+        {type: 1, value: "user.name"},
+        {type: 0, value: ", you have "},
+        {type: 1, value: "user.messages.unread | length"},
+        {type: 0, value: " unread messages."}
+      ]
+
+      results = Rivets.TextTemplateParser.parse(template)
+      expect(results.length).toBe(5)
+
+      for (i = 0; i < results.length; i++) {
+        expect(results[i].type).toBe(expected[i].type)
+        expect(results[i].value).toBe(expected[i].value)
+      }
+    })
+
+    describe("with no binding fragments", function() {
+      it("should return a single text token", function() {
+        template = "Hello World!"
+        expected = [{type: 0, value: "Hello World!"}]
+
+        results = Rivets.TextTemplateParser.parse(template)
+        expect(results.length).toBe(1)
+
+        for (i = 0; i < results.length; i++) {
+          expect(results[i].type).toBe(expected[i].type)
+          expect(results[i].value).toBe(expected[i].value)
+        }
+      })
+    })
+
+    describe("with only a binding fragment", function() {
+      it("should return a single binding token", function() {
+        template = "{{ user.name }}"
+        expected = [{type: 1, value: "user.name"}]
+
+        results = Rivets.TextTemplateParser.parse(template)
+        expect(results.length).toBe(1)
+
+        for (i = 0; i < results.length; i++) {
+          expect(results[i].type).toBe(expected[i].type)
+          expect(results[i].value).toBe(expected[i].value)
+        }
+      })
+    })
+  })
+})