Playwright test file attachment data engine

source/AAS.TwinEngine.Plugin.TestPlugin.PlaywrightTests/SubmodelRepository/GetSubmodelElementsFileAttachmentTest.cs

@@ -0,0 +1,65 @@
+namespace AAS.TwinEngine.Plugin.TestPlugin.PlaywrightTests.SubmodelRepository;
+
+/// <summary>
+/// Tests for GET /submodels/{submodelIdentifier}/submodel-elements/{idShortPath}/attachment
+/// </summary>
+public class GetSubmodelElementsFileAttachmentTest : ApiTestBase
+{
+    private const string FileElementIdShortPath = "Documents%255B0%255D.DocumentVersions%255B1%255D.PreviewFile";
+
+    [Fact]
+    public async Task GetSubmodelElementFileAttachment_HandoverDocumentation_ShouldReturnBinary_WithContentTypeFromFileElement()
+    {
+        // Arrange
+        var encodedPath = FileElementIdShortPath;
+        var attachmentUrl = $"/submodels/{SubmodelIdentifierHandoverDocumentation}/submodel-elements/{encodedPath}/attachment";
+
+        // Act
+        var attachmentResponse = await ApiContext.GetAsync(attachmentUrl);
+
+        // Assert
+        Assert.Equal(200, attachmentResponse.Status);
+    }
+
+    [Fact]
+    public async Task GetSubmodelElementFileAttachment_WhenElementIsNotFile_ShouldReturn400()
+    {
+        // Arrange
+        var url = $"/submodels/{SubmodelIdentifierContact}/submodel-elements/ContactInformation1/attachment";
+
+        // Act
+        var response = await ApiContext.GetAsync(url);
+
+        // Assert
+        Assert.Equal(400, response.Status);
+    }
+
+    [Fact]
+    public async Task GetSubmodelElementFileAttachment_WhenElementPathDoesNotExist_ShouldReturn404()
+    {
+        // Arrange
+        var missingPath = "Documents[0].DocumentVersions[0].VersionFile";
+        var url = $"/submodels/{SubmodelIdentifierHandoverDocumentation}/submodel-elements/{missingPath}/attachment";
+
+        // Act
+        var response = await ApiContext.GetAsync(url);
+
+        // Assert
+        Assert.Equal(404, response.Status);
+    }
+
+    [Fact]
+    public async Task GetSubmodelElementFileAttachment_WhenSubmodelDoesNotExist_ShouldReturn404()
+    {
+        // Arrange
+        var missingSubmodel = Base64EncodeUrl("https://mm-software.com/submodel/000-001/DoesNotExist");
+        var path = FileElementIdShortPath;
+        var url = $"/submodels/{missingSubmodel}/submodel-elements/{path}/attachment";
+
+        // Act
+        var response = await ApiContext.GetAsync(url);
+
+        // Assert
+        Assert.Equal(404, response.Status);
+    }
+}