public static void PackageExists_Throws(string packageName)
        {
            var tool = new NuGetTool();

            Assert.That(tool, Is.Not.Null);

            Assert.That(() => tool.PackageExists(packageName), Throws.TypeOf <ArgumentException>());
        }
        public static void PackageExists1_ReturnsExpectedValue(string packageName, bool expectedResult)
        {
            var tool = new NuGetTool();

            Assert.That(tool, Is.Not.Null);

            var result = tool.PackageExists(packageName);

            Assert.That(result, Is.EqualTo(expectedResult));
        }