Add tests for define and require

test/src/application/loader.spec.ts

@@ -16,6 +16,79 @@ describe('ModuleLoader', () => {
     loader = new ModuleLoader();
   });
 
+  describe('#constructor()', () => {
+
+    it('should create a ModuleLoader object', () => {
+      expect(loader).to.be.a(ModuleLoader);
+    });
+
+  });
+
+  describe('#define()', () => {
+
+    it('should define a module that can be synchronously required', () => {
+      let called = false;
+      let callback = (module: any, exports: any, require: any) => {
+        called = true;
+      };
+      loader.define('foo@1.0.1/index.js', callback);
+      loader.require('foo@^1.0.1/index.js');
+      expect(called).to.be(true);
+    });
+
+    it('should be a no-op if the path is already registered', () => {
+      let called0 = false;
+      let called1 = false;
+      let callback0 = (module: any, exports: any, require: any) => {
+        called0 = true;
+      };
+      let callback1 = (module: any, exports: any, require: any) => {
+        called1 = true;
+      };
+      loader.define('foo@1.0.1/index.js', callback0);
+      loader.define('foo@1.0.1/index.js', callback1);
+      loader.require('foo@^1.0.1/index.js');
+      expect(called0).to.be(true);
+      expect(called1).to.be(false);
+    });
+
+  });
+
+  describe('#require()', () => {
+
+    it('should synchronously return a module that has already been loaded', () => {
+      let callback = (module: any, exports: any, require: any) => {
+        module.exports = 'hello';
+      };
+      loader.define('foo@1.0.1/index.js', callback);
+      let value = loader.require('foo@^1.0/index.js');
+      expect(value).to.be('hello');
+    });
+
+    it('should return the maximally satisfying module', () => {
+      let callback0 = (module: any, exports: any, require: any) => {
+        module.exports = '1.0.0';
+      };
+      loader.define('foo@1.0.0/index.js', callback0);
+      let callback1 = (module: any, exports: any, require: any) => {
+        module.exports = '1.0.1';
+      };
+      loader.define('foo@1.0.1/index.js', callback1);
+      let value = loader.require('foo@^1.0/index.js');
+      expect(value).to.be('1.0.1');
+    });
+
+    it('should throw an error if the required module is not found', () => {
+      expect(() => { loader.require('foo@^1.0/index.js'); }).to.throwError();
+      let callback = (module: any, exports: any, require: any) => {
+        module.exports = 'hello';
+      };
+      loader.define('foo@1.0.1/index.js', callback);
+      expect(() => { loader.require('foo@^1.0.2/index.js'); }).to.throwError();
+    });
+
+  });
+
   describe('#extractPlugins()', () => {
 
     it('should pass for a valid plugin array', () => {