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Description

It would be great if you can count occurrences of XML nodes.
Reason is: According to the openTRANS standard various nodes have to be available exactly once.

Complete minimal example reproducing the issue

None, because the method does not exist :)

Expected behavior:

Intellisense shows something like:

• xDoc.Should().HaveElement("element").**Single()**
  or
• xDoc.Should().HaveElement("element").**And.HaveCount(3)**

Versions

• Which version of Fluent Assertions are you using? 6.1.0
• Which .NET runtime and version are you targeting? .NET Core 3.1