Use more specific assertions in CompilerAssert (#7122)

Author: forki

tests/fsharp/Compiler/CompilerAssert.fs

@@ -54,25 +54,26 @@ module CompilerAssert =
         lock lockObj <| fun () ->
             let parseResults, fileAnswer = checker.ParseAndCheckFileInProject("test.fs", 0, SourceText.ofString source, defaultProjectOptions) |> Async.RunSynchronously
 
-            Assert.True(parseResults.Errors.Length = 0, sprintf "Parse errors: %A" parseResults.Errors)
+            Assert.IsEmpty(parseResults.Errors, sprintf "Parse errors: %A" parseResults.Errors)
 
             match fileAnswer with
             | FSharpCheckFileAnswer.Aborted _ -> Assert.Fail("Type Checker Aborted")
             | FSharpCheckFileAnswer.Succeeded(typeCheckResults) ->
 
-            Assert.True(typeCheckResults.Errors.Length = 0, sprintf "Type Check errors: %A" typeCheckResults.Errors)
+            Assert.IsEmpty(typeCheckResults.Errors, sprintf "Type Check errors: %A" typeCheckResults.Errors)
+
 
     let TypeCheckSingleError (source: string) (expectedErrorNumber: int) (expectedErrorRange: int * int * int * int) (expectedErrorMsg: string) =
         lock lockObj <| fun () ->
             let parseResults, fileAnswer = checker.ParseAndCheckFileInProject("test.fs", 0, SourceText.ofString source, defaultProjectOptions) |> Async.RunSynchronously
 
-            Assert.True(parseResults.Errors.Length = 0, sprintf "Parse errors: %A" parseResults.Errors)
+            Assert.IsEmpty(parseResults.Errors, sprintf "Parse errors: %A" parseResults.Errors)
 
             match fileAnswer with
             | FSharpCheckFileAnswer.Aborted _ -> Assert.Fail("Type Checker Aborted")
             | FSharpCheckFileAnswer.Succeeded(typeCheckResults) ->
 
-            Assert.True(typeCheckResults.Errors.Length = 1, sprintf "Expected one type check error: %A" typeCheckResults.Errors)
+            Assert.AreEqual(1, typeCheckResults.Errors.Length, sprintf "Expected one type check error: %A" typeCheckResults.Errors)
             typeCheckResults.Errors
             |> Array.iter (fun info ->
                 Assert.AreEqual(FSharpErrorSeverity.Error, info.Severity)