[Framework] Fill in spec for Extension

Fill in spec for Extension, part of the framework
component. WTD-518.

platform/framework/test/load/ExtensionSpec.js

@@ -4,12 +4,85 @@
  * ExtensionSpec. Created by vwoeltje on 11/6/14.
  */
 define(
-    [],
-    function () {
+    ["../../src/load/Extension", "../../src/load/Bundle"],
+    function (Extension, Bundle) {
         "use strict";
 
-        describe("", function () {
+        describe("An extension", function () {
+            var bundle;
 
+            beforeEach(function () {
+                bundle = new Bundle("test/bundle", {});
+            });
+
+            it("reports its key", function () {
+                expect(new Extension(bundle, "tests", { key: "testKey"}).getKey())
+                    .toEqual("testKey");
+            });
+
+            it("reports some key, even if non is defined", function () {
+                expect(new Extension(bundle, "tests", {}).getKey()).toBeDefined();
+            });
+
+            it("allows retrieval of its declaring bundle", function () {
+                expect(new Extension(bundle, "tests", {}).getBundle()).toBe(bundle);
+            });
+
+            it("reports its category", function () {
+                expect(new Extension(bundle, "tests", {}).getCategory())
+                    .toEqual("tests");
+                expect(new Extension(bundle, "otherThings", {}).getCategory())
+                    .toEqual("otherThings");
+            });
+
+            it("provides a check to see if an implementation is associated with the extension", function () {
+                expect(new Extension(bundle, "tests", {}).hasImplementation())
+                    .toBeFalsy();
+                expect(new Extension(bundle, "tests", { implementation: "Something.js" }).hasImplementation())
+                    .toBeTruthy();
+            });
+
+            it("provides a full path to an implementation, if present", function () {
+                expect(new Extension(bundle, "tests", { implementation: "Something.js" }).getImplementationPath())
+                    .toEqual("test/bundle/src/Something.js");
+            });
+
+            it("does not define an implementation path if there is no implementation", function () {
+                expect(new Extension(bundle, "tests", {}).getImplementationPath())
+                    .toBeUndefined();
+            });
+
+            it("provides a log-friendly name which contains the extension key", function () {
+                var logName =
+                        new Extension(bundle, "tests", { key: "testKey"}).getLogName();
+                expect(logName.indexOf("testKey")).not.toEqual(-1);
+            });
+
+            it("allows its definition to be retrieved", function () {
+                var definition = {
+                        key: "someKey",
+                        implementation: "SomeImplementation.js"
+                    },
+                    reported = new Extension(bundle, "tests", definition).getDefinition();
+
+                // Bundle is added, so we can't do a normal toEqual; check that
+                // all keys are still there, though.
+                Object.keys(definition).forEach(function (k) {
+                    expect(reported[k]).toEqual(definition[k]);
+                });
+            });
+
+            it("includes the bundle in its definition", function () {
+                // Bundle is needed by some registrars in the the registration phase,
+                // so make sure it gets attached to the definition.
+                var definition = {
+                        key: "someKey",
+                        implementation: "SomeImplementation.js"
+                    },
+                    reported = new Extension(bundle, "tests", definition).getDefinition();
+
+                expect(reported.bundle).toEqual(bundle.getDefinition());
+            });
         });
     }
 );