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diff --git a/node_modules/is-generator-function/test/.eslintrc b/node_modules/is-generator-function/test/.eslintrc
new file mode 100644
index 00000000..168cdf85
--- /dev/null
+++ b/node_modules/is-generator-function/test/.eslintrc
@@ -0,0 +1,5 @@
+{
+	"rules": {
+		"max-statements-per-line": [2, { "max": 2 }]
+	}
+}
diff --git a/node_modules/is-generator-function/test/corejs.js b/node_modules/is-generator-function/test/corejs.js
new file mode 100644
index 00000000..73f0c89c
--- /dev/null
+++ b/node_modules/is-generator-function/test/corejs.js
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+'use strict';
+
+require('core-js');
+
+require('./');
diff --git a/node_modules/is-generator-function/test/index.js b/node_modules/is-generator-function/test/index.js
new file mode 100644
index 00000000..a33cc2b7
--- /dev/null
+++ b/node_modules/is-generator-function/test/index.js
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+'use strict';
+
+/* globals window */
+
+var test = require('tape');
+var isGeneratorFunction = require('../index');
+var generatorFunc = require('make-generator-function');
+var hasToStringTag = typeof Symbol === 'function' && typeof Symbol.toStringTag === 'symbol';
+
+var forEach = function (arr, func) {
+	var i;
+	for (i = 0; i < arr.length; ++i) {
+		func(arr[i], i, arr);
+	}
+};
+
+test('returns false for non-functions', function (t) {
+	var nonFuncs = [
+		true,
+		false,
+		null,
+		undefined,
+		{},
+		[],
+		/a/g,
+		'string',
+		42,
+		new Date()
+	];
+	t.plan(nonFuncs.length);
+	forEach(nonFuncs, function (nonFunc) {
+		t.notOk(isGeneratorFunction(nonFunc), nonFunc + ' is not a function');
+	});
+	t.end();
+});
+
+test('returns false for non-generator functions', function (t) {
+	var func = function () {};
+	t.notOk(isGeneratorFunction(func), 'anonymous function is not an generator function');
+
+	var namedFunc = function foo() {};
+	t.notOk(isGeneratorFunction(namedFunc), 'named function is not an generator function');
+
+	if (typeof window === 'undefined') {
+		t.skip('window.alert is not an generator function');
+	} else {
+		t.notOk(isGeneratorFunction(window.alert), 'window.alert is not an generator function');
+	}
+	t.end();
+});
+
+test('returns false for non-generator function with faked toString', function (t) {
+	var func = function () {};
+	func.toString = function () { return 'function* () { return "TOTALLY REAL I SWEAR!"; }'; };
+
+	t.notEqual(String(func), Function.prototype.toString.apply(func), 'faked toString is not real toString');
+	t.notOk(isGeneratorFunction(func), 'anonymous function with faked toString is not a generator function');
+	t.end();
+});
+
+test('returns false for non-generator function with faked @@toStringTag', { skip: !hasToStringTag }, function (t) {
+	var fakeGenFunction = {
+		toString: function () { return String(generatorFunc); },
+		valueOf: function () { return generatorFunc; }
+	};
+	fakeGenFunction[Symbol.toStringTag] = 'GeneratorFunction';
+	t.notOk(isGeneratorFunction(fakeGenFunction), 'fake GeneratorFunction with @@toStringTag "GeneratorFunction" is not a generator function');
+	t.end();
+});
+
+test('returns true for generator functions', function (t) {
+	if (generatorFunc) {
+		t.ok(isGeneratorFunction(generatorFunc), 'generator function is generator function');
+	} else {
+		t.skip('generator function is generator function - this environment does not support ES6 generator functions. Please run `node --harmony`, or use a supporting browser.');
+	}
+	t.end();
+});
+
+test('concise methods', { skip: !generatorFunc || !generatorFunc.concise }, function (t) {
+	t.test('returns true for concise generator methods', function (st) {
+		st.ok(isGeneratorFunction(generatorFunc.concise), 'concise generator method is generator function');
+		st.end();
+	});
+
+	t.test('returns false for concise non-generator methods', function (st) {
+		var conciseMethod = Function('return { concise() {} }.concise;')();
+		st.equal(typeof conciseMethod, 'function', 'assert: concise method exists');
+		st.notOk(isGeneratorFunction(conciseMethod), 'concise non-generator method is not generator function');
+		st.end();
+	});
+
+	t.end();
+});
diff --git a/node_modules/is-generator-function/test/uglified.js b/node_modules/is-generator-function/test/uglified.js
new file mode 100644
index 00000000..fd82b553
--- /dev/null
+++ b/node_modules/is-generator-function/test/uglified.js
@@ -0,0 +1,8 @@
+'use strict';
+
+require('uglify-register/api').register({
+	exclude: [/\/node_modules\//, /\/test\//],
+	uglify: { mangle: true }
+});
+
+require('./');