test: Tests for dependency resolution

__tests__/lib/input/dependency.js

@@ -0,0 +1,37 @@
+var os = require('os');
+var shell = require('shelljs');
+var path = require('path');
+var fs = require('fs');
+var dependency = require('../../../src/input/dependency');
+
+function inputs(contents) {
+  var dirEntry = os.tmpdir();
+  var paths = {};
+  for (var filename in contents) {
+    paths[filename] = path.join(dirEntry, '/', filename);
+    fs.writeFileSync(paths[filename], contents[filename]);
+  }
+  return {
+    paths
+  };
+}
+
+test('dependency', async function() {
+  let { paths, cleanup } = inputs({
+    'index.js': 'module.exports = 1;',
+    'requires.js': "module.exports = require('./foo');",
+    'foo.js': 'module.exports = 2;'
+  });
+  {
+    let dependencies = await dependency([paths['index.js']], {
+      parseExtension: ['js']
+    });
+    expect(dependencies.length).toEqual(1);
+  }
+  {
+    let dependencies = await dependency([paths['requires.js']], {
+      parseExtension: ['js']
+    });
+    expect(dependencies.length).toEqual(2);
+  }
+});