Add tests for TypeScript

test/typescript.js

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+/* eslint-env mocha */
+'use strict';
+
+const madge = require('../lib/api');
+require('should');
+
+describe('TypeScript', () => {
+	const dir = __dirname + '/typescript';
+
+	it('extracts module dependencies', (done) => {
+		madge(dir + '/import.ts').then((res) => {
+			res.obj().should.eql({
+				'import.ts': ['require.ts'],
+				'require.ts': ['export.ts'],
+				'export.ts': []
+			});
+			done();
+		}).catch(done);
+	});
+});

test/typescript/export.ts

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+class ExportClass {
+    stringLength(s: string) {
+        return s.length;
+    }
+}
+
+export = ExportClass;

test/typescript/import.ts

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+import B from './require';
+
+class ImportClass {
+    constructor(public greeting: string) { }
+    greet() {
+        return "<h1>" + this.greeting + "</h1>";
+    }
+};

test/typescript/require.ts

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+import x = require('./export');
+
+export default class RequireClass  {
+    stringLength(s: string) {
+        return s.length;
+    }
+}