refactor(tests): TestContext.Out.WriteLine(sprintf to fprintf TestContext.Out

Author: xperiandri

tests/FSharpLint.Core.Tests/Framework/TestAbstractSyntaxArray.fs

@@ -104,7 +104,7 @@ type TestAst() =
         let result = times |> Seq.sum |> (fun totalMilliseconds -> totalMilliseconds / int64 iterations)
 
         Assert.Less(result, 200)
-        TestContext.Out.WriteLine(sprintf "Built array in an average of %d milliseconds." result)
+        fprintf TestContext.Out "Built array in an average of %d milliseconds." result
 
     [<Test>]
     member __.``Syntax array constructed from AST in valid order.``() =

tests/FSharpLint.Core.Tests/Framework/TestFuzzyHintMatcher.fs

@@ -146,7 +146,7 @@ type TestAst() =
 
         stopwatch.Stop()
         Assert.Less(stopwatch.ElapsedMilliseconds, 50)
-        TestContext.Out.WriteLine(sprintf "Iterated array in %d milliseconds." stopwatch.ElapsedMilliseconds)
+        fprintf TestContext.Out "Iterated array in %d milliseconds." stopwatch.ElapsedMilliseconds
 
     [<Category("Hint Matcher")>]
     [<Test>]

tests/FSharpLint.FunctionalTest/TestApi.fs

@@ -58,7 +58,7 @@ module TestApi =
             let result = times |> Seq.sum |> (fun totalMilliseconds -> totalMilliseconds / int64 iterations)
 
             Assert.Less(result, 250)
-            TestContext.Out.WriteLine(sprintf "Average runtime of linter on parsed file: %d (milliseconds)."  result)
+            fprintf TestContext.Out "Average runtime of linter on parsed file: %d (milliseconds)."  result
 
         [<Test>]
         member __.``Lint project via absolute path``() =