rspec/rules/S4201/vbnet/rule.adoc

== Why is this an issue?

There's no need to null test in conjunction with an ``++TypeOf ... Is++`` test. ``++Nothing++`` is not an instance of anything, so a null check is redundant.

=== Noncompliant code example

[source,vbnet]
----
If (x IsNot Nothing And TypeOf x Is MyClass)
    ' ...
End If

If (x Is Nothing Or TypeOf x IsNot MyClass)
    ' ...
End If
----

=== Compliant solution

[source,vbnet]
----
If (TypeOf x Is MyClass)
    ' ...
End If

If (TypeOf x IsNot MyClass)
    ' ...
End If
----
ifdef::env-github,rspecator-view[]

'''
== Implementation Specification
(visible only on this page)

include::../message.adoc[]

include::../highlighting.adoc[]

endif::env-github,rspecator-view[]