public void Process_WithEmptyForName_Throws()
{
// Arrange
var expectedMessage = "The name of an HTML field cannot be null or empty. Instead use methods " +
"Microsoft.AspNetCore.Mvc.Rendering.IHtmlHelper.Editor or Microsoft.AspNetCore.Mvc.Rendering." +
"IHtmlHelper`1.EditorFor with a non-empty htmlFieldName argument value.";
var expectedTagName = "select";
var metadataProvider = new EmptyModelMetadataProvider();
var htmlGenerator = new TestableHtmlGenerator(metadataProvider);
var model = "model-value";
var modelExplorer = metadataProvider.GetModelExplorerForType(typeof(string), model);
var modelExpression = new ModelExpression(name: string.Empty, modelExplorer: modelExplorer);
var viewContext = TestableHtmlGenerator.GetViewContext(model, htmlGenerator, metadataProvider);
var tagHelper = new SelectTagHelper(htmlGenerator)
{
For = modelExpression,
ViewContext = viewContext,
};
var context = new TagHelperContext(new TagHelperAttributeList(), new Dictionary <object, object>(), "test");
var output = new TagHelperOutput(
expectedTagName,
new TagHelperAttributeList(),
(_, __) => Task.FromResult <TagHelperContent>(new DefaultTagHelperContent()));
// Act & Assert
ExceptionAssert.ThrowsArgument(
() => tagHelper.Process(context, output),
paramName: "expression",
exceptionMessage: expectedMessage);
}
public void Process_PassesNameThrough_EvenIfNullFor()
{
// Arrange
var expectedAttributeValue = "-expression-";
var expectedTagName = "span";
var selectList = Array.Empty <SelectListItem>();
var generator = new Mock <IHtmlGenerator>(MockBehavior.Strict);
generator
.Setup(gen => gen.GenerateGroupsAndOptions(/* optionLabel: */ null, selectList))
.Returns(HtmlString.Empty)
.Verifiable();
var metadataProvider = new EmptyModelMetadataProvider();
var viewContext = TestableHtmlGenerator.GetViewContext(
model: null,
htmlGenerator: generator.Object,
metadataProvider: metadataProvider);
var tagHelper = new SelectTagHelper(generator.Object)
{
Items = selectList,
Name = expectedAttributeValue,
ViewContext = viewContext,
};
var attributes = new TagHelperAttributeList
{
{ "name", expectedAttributeValue },
};
var tagHelperContext = new TagHelperContext(attributes, new Dictionary <object, object>(), "test");
var output = new TagHelperOutput(
expectedTagName,
new TagHelperAttributeList(),
(_, __) => Task.FromResult <TagHelperContent>(new DefaultTagHelperContent()));
// Act
tagHelper.Process(tagHelperContext, output);
// Assert
generator.VerifyAll();
Assert.Equal(expectedTagName, output.TagName);
var attribute = Assert.Single(output.Attributes);
Assert.Equal("name", attribute.Name);
Assert.Equal(expectedAttributeValue, attribute.Value);
}
public void Process_WithEmptyForName_DoesNotThrow_WithName()
{
// Arrange
var expectedAttributeValue = "-expression-";
var expectedTagName = "select";
var metadataProvider = new EmptyModelMetadataProvider();
var htmlGenerator = new TestableHtmlGenerator(metadataProvider);
var model = "model-value";
var modelExplorer = metadataProvider.GetModelExplorerForType(typeof(string), model);
var modelExpression = new ModelExpression(name: string.Empty, modelExplorer: modelExplorer);
var viewContext = TestableHtmlGenerator.GetViewContext(model, htmlGenerator, metadataProvider);
var tagHelper = new SelectTagHelper(htmlGenerator)
{
For = modelExpression,
Name = expectedAttributeValue,
ViewContext = viewContext,
};
var attributes = new TagHelperAttributeList
{
{ "name", expectedAttributeValue },
};
var context = new TagHelperContext(attributes, new Dictionary <object, object>(), "test");
var output = new TagHelperOutput(
expectedTagName,
new TagHelperAttributeList(),
(_, __) => Task.FromResult <TagHelperContent>(new DefaultTagHelperContent()));
// Act
tagHelper.Process(context, output);
// Assert
Assert.Equal(expectedTagName, output.TagName);
Assert.False(output.IsContentModified);
var attribute = Assert.Single(output.Attributes);
Assert.Equal("name", attribute.Name);
Assert.Equal(expectedAttributeValue, attribute.Value);
}
