asynctest.snippet

<?xml version="1.0" encoding="utf-8"?>
<CodeSnippets xmlns="http://schemas.microsoft.com/VisualStudio/2005/CodeSnippet">
  <CodeSnippet Format="1.0.0">
    <Header>
      <Title>Async Unit Test</Title>
      <Author>Rusty Divine</Author>
      <Description>Async Unit Test Template with 3 Parts</Description>
      <HelpUrl>https://msdn.microsoft.com/en-us/library/ms165394.aspx</HelpUrl>
      <SnippetTypes />
      <Keywords />
      <Shortcut>uat</Shortcut>
    </Header>
    <Snippet>
      <References />
      <Imports />
      <Declarations>
        <Literal Editable="true">
          <ID>uow</ID>
          <Type></Type>
          <ToolTip>Name of the unit of work or scenario under test</ToolTip>
          <Default>UoW</Default>
          <Function></Function>
        </Literal>
        <Literal Editable="true">
          <ID>initialcondition</ID>
          <Type></Type>
          <ToolTip></ToolTip>
          <Default>InitialCondition</Default>
          <Function></Function>
        </Literal>
        <Literal Editable="true">
          <ID>expectedresult</ID>
          <Type></Type>
          <ToolTip>What your expected result is</ToolTip>
          <Default>ExpectedResult</Default>
          <Function></Function>
        </Literal>
      </Declarations>
      <Code Language="csharp" Kind="method decl" Delimiter="$"><![CDATA[[TestMethod]
public async Task $uow$_$initialcondition$_$expectedresult$()
{
	//Arrange
	$end$		
	//Act
	
	//Assert
	
}]]></Code>
    </Snippet>
  </CodeSnippet>
</CodeSnippets>

unittest.snippet

<?xml version="1.0" encoding="utf-8"?>
<CodeSnippets xmlns="http://schemas.microsoft.com/VisualStudio/2005/CodeSnippet">
  <CodeSnippet Format="1.0.0">
    <Header>
      <Title>Unit Test</Title>
      <Author>Rusty Divine</Author>
      <Description>Unit Test Template with 3 Parts</Description>
      <HelpUrl>https://msdn.microsoft.com/en-us/library/ms165394.aspx</HelpUrl>
      <SnippetTypes />
      <Keywords />
      <Shortcut>ut</Shortcut>
    </Header>
    <Snippet>
      <References />
      <Imports />
      <Declarations>
        <Literal Editable="true">
          <ID>uow</ID>
          <Type></Type>
          <ToolTip>Name of the unit of work or scenario under test</ToolTip>
          <Default>UoW</Default>
          <Function></Function>
        </Literal>
        <Literal Editable="true">
          <ID>initialcondition</ID>
          <Type></Type>
          <ToolTip></ToolTip>
          <Default>InitialCondition</Default>
          <Function></Function>
        </Literal>
        <Literal Editable="true">
          <ID>expectedresult</ID>
          <Type></Type>
          <ToolTip>What your expected result is</ToolTip>
          <Default>ExpectedResult</Default>
          <Function></Function>
        </Literal>
      </Declarations>
      <Code Language="csharp" Kind="method decl" Delimiter="$"><![CDATA[[TestMethod]
public void $uow$_$initialcondition$_$expectedresult$()
{
	//Arrange
	$end$

	//Act


	//Assert

}]]></Code>
    </Snippet>
  </CodeSnippet>
</CodeSnippets>

Small addition (i'm sure Osmyn doesn't mind): To use the Async version of the unittest snippet type uat and hit and hit tab twice.

Thanks, @FrederikSthenHansen!