PowerToys/src/modules/previewpane/UnitTests-SvgPreviewHandler/SvgPreviewHandlerHelperTests.cs

// Copyright (c) Microsoft Corporation
// The Microsoft Corporation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using Microsoft.VisualStudio.TestTools.UnitTesting;
using SvgPreviewHandler.Utilities;
using System.Text;

namespace UnitTests_SvgPreviewHandler
{
    [TestClass]
    public class SvgPreviewHandlerHelperTests
    {
        [TestMethod]
        public void CheckBlockedElements_ShouldReturnTrue_IfABlockedElementIsPresent()
        {
            // Arrange
            var svgBuilder = new StringBuilder();
            svgBuilder.AppendLine("<svg width =\"200\" height=\"200\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">");
            svgBuilder.AppendLine("\t<script>alert(\"hello\")</script>");
            svgBuilder.AppendLine("</svg>");
            bool foundFilteredElement;

            // Act
            foundFilteredElement = SvgPreviewHandlerHelper.CheckBlockedElements(svgBuilder.ToString());

            // Assert
            Assert.IsTrue(foundFilteredElement);
        }

        [TestMethod]
        public void CheckBlockedElements_ShouldReturnTrue_IfBlockedElementsIsPresentInNestedLevel()
        {
            // Arrange
            var svgBuilder = new StringBuilder();
            svgBuilder.AppendLine("<svg viewBox=\"0 0 100 100\" xmlns=\"http://www.w3.org/2000/svg\">");
            svgBuilder.AppendLine("\t<circle cx=\"50\" cy=\"50\" r=\"50\">");
            svgBuilder.AppendLine("\t\t<script>alert(\"valid-message\")</script>");
            svgBuilder.AppendLine("\t</circle>");
            svgBuilder.AppendLine("</svg>");
            bool foundFilteredElement;

            // Act
            foundFilteredElement = SvgPreviewHandlerHelper.CheckBlockedElements(svgBuilder.ToString());

            // Assert
            Assert.IsTrue(foundFilteredElement);
        }

        [TestMethod]
        public void CheckBlockedElements_ShouldReturnTrue_IfMultipleBlockedElementsArePresent()
        {
            // Arrange
            var svgBuilder = new StringBuilder();
            svgBuilder.AppendLine("<svg width =\"200\" height=\"200\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">");
            svgBuilder.AppendLine("\t<script>alert(\"valid-message\")</script>");
            svgBuilder.AppendLine("\t<image href=\"valid-url\" height=\"200\" width=\"200\"/>");
            svgBuilder.AppendLine("</svg>");
            bool foundFilteredElement;

            // Act
            foundFilteredElement = SvgPreviewHandlerHelper.CheckBlockedElements(svgBuilder.ToString());

            // Assert
            Assert.IsTrue(foundFilteredElement);
        }

        [TestMethod]
        public void CheckBlockedElements_ShouldReturnFalse_IfNoBlockedElementsArePresent()
        {
            // Arrange
            var svgBuilder = new StringBuilder();
            svgBuilder.AppendLine("<svg viewBox=\"0 0 100 100\" xmlns=\"http://www.w3.org/2000/svg\">");
            svgBuilder.AppendLine("\t<circle cx=\"50\" cy=\"50\" r=\"50\">");
            svgBuilder.AppendLine("\t</circle>");
            svgBuilder.AppendLine("</svg>");
            bool foundFilteredElement;

            // Act
            foundFilteredElement = SvgPreviewHandlerHelper.CheckBlockedElements(svgBuilder.ToString());

            // Assert
            Assert.IsFalse(foundFilteredElement);
        }

        [DataTestMethod]
        [DataRow("")]
        [DataRow("  ")]
        [DataRow(null)]
        public void CheckBlockedElements_ShouldReturnFalse_IfSvgDataIsNullOrWhiteSpaces(string svgData)
        {
            // Arrange
            bool foundFilteredElement;

            // Act
            foundFilteredElement = SvgPreviewHandlerHelper.CheckBlockedElements(svgData);

            // Assert
            Assert.IsFalse(foundFilteredElement);
        }
    }
}