Core.Tests: add a regression test

This test was incorporated following the suggestion of
@webwarrior-ws to include a test case that utilizes three
pipe operators [1].

[1] #697 (review)

Author: Mersho

tests/FSharpLint.Core.Tests/Rules/Conventions/AvoidSinglePipeOperator.fs

@@ -186,6 +186,16 @@ module Foo
 module Foo
 
 -1.0 |> printf "%d" |> ignore
+"""
+
+        Assert.IsTrue this.NoErrorsExist
+
+    [<Test>]
+    member this.``Use pipe operator thrice without binding``() =
+        this.Parse """
+module Foo
+
+-1.0 |> printf "%d" |> ignore |> someOtherFunc
 """
 
         Assert.IsTrue this.NoErrorsExist