public async Task ProcessAsync_WithoutSpecifyingRenderMode_ThrowsError()
{
// Arrange
var tagHelper = new ComponentTagHelper
{
ViewContext = GetViewContext(),
};
var context = GetTagHelperContext();
var output = GetTagHelperOutput();
// Act & Assert
var ex = await Assert.ThrowsAsync <InvalidOperationException>(() => tagHelper.ProcessAsync(context, output));
Assert.Equal("A value for the 'render-mode' attribute must be supplied to the 'component' tag helper.", ex.Message);
}
public async Task ProcessAsync_RendersComponent()
{
// Arrange
var tagHelper = new ComponentTagHelper
{
ViewContext = GetViewContext(),
RenderMode = RenderMode.Static,
};
var context = GetTagHelperContext();
var output = GetTagHelperOutput();
// Act
await tagHelper.ProcessAsync(context, output);
// Assert
var content = HtmlContentUtilities.HtmlContentToString(output.Content);
Assert.Equal("Hello world", content);
Assert.Null(output.TagName);
}
public static async Task <IHtmlContent> RenderComponentAsync(
Type componentType,
Action <IServiceCollection> configureServices,
IDictionary <string, object> parameters = null,
RenderMode renderMode = RenderMode.Static)
{
var diContainer = new ServiceCollection();
diContainer.AddLogging();
diContainer.AddRazorPages();
configureServices(diContainer);
diContainer.TryAddScoped(sp => new HttpClient {
BaseAddress = new Uri("http://localhost:5000/")
});
using var serviceProvider = diContainer.BuildServiceProvider();
using var scope = serviceProvider.CreateScope();
var featureCollection = new FeatureCollection();
featureCollection.Set <IHttpRequestFeature>(new HttpRequestFeature
{
Protocol = "HTTP/2",
Scheme = "http",
Method = "GET",
PathBase = "",
Path = "/",
QueryString = "",
RawTarget = "/",
Headers = { { "Host", "localhost:5000" } }
});
featureCollection.Set <IHttpResponseFeature>(new HttpResponseFeature());
var httpContextFactory = new DefaultHttpContextFactory(scope.ServiceProvider);
var httpContext = httpContextFactory.Create(featureCollection);
var attributes = new TagHelperAttributeList();
var tagHelperContext = new TagHelperContext(attributes, new Dictionary <object, object>(), Guid.NewGuid().ToString("N"));
var tagHelperOutput = new TagHelperOutput(
tagName: string.Empty,
attributes,
getChildContentAsync: (_, _) => Task.FromResult(new DefaultTagHelperContent() as TagHelperContent));
var componentTagHelper = new ComponentTagHelper
{
ComponentType = componentType,
RenderMode = renderMode,
Parameters = parameters,
ViewContext = new ViewContext {
HttpContext = httpContext
}
};
await componentTagHelper.ProcessAsync(tagHelperContext, tagHelperOutput);
httpContextFactory.Dispose(httpContext);
return(tagHelperOutput.Content);
}
