Delete error info and unused index numbers from parser tests (#895)

* Adding test

* Fixed tests

* Delete error info

* cleanup

* Delete using

* Only one FormatError method

Author: brianbok

src/Parsing/Test/ErrorAssertions.cs

@@ -6,6 +6,14 @@
 using FluentAssertions.Primitives;
 
 namespace Microsoft.Python.Parsing.Tests {
+    internal static class ErrorResultExtensions {
+        public static string Format(this ErrorResult err) {
+            var s = err.Span.Start;
+            var e = err.Span.End;
+            return $"new ErrorResult(\"{err.Message}\", new SourceSpan({s.Line}, {s.Column}, {e.Line}, {e.Column}))";
+        }
+    }
+
     internal static class ErrorResultArrayExtensions {
         public static ErrorResultArrayAssertions Should(this ErrorResult[] instance) {
             return new ErrorResultArrayAssertions(instance);
@@ -23,15 +31,15 @@ public AndConstraint<ErrorResultArrayAssertions> HaveErrors(ErrorResult[] expect
             for (var i = 0; i < expected.Length; i++) {
                 Execute.Assertion
                     .ForCondition(Subject.Length > i)
-                    .FailWith("No error {0}: {1}", i, FormatError(expected[i]));
+                    .FailWith("No error {0}: {1}", i, expected[i].Format());
 
                 Execute.Assertion
                     .ForCondition(Subject[i].Message == expected[i].Message)
-                    .FailWith("Wrong msg for error {0}: expected {1}, got {2}", i, FormatError(expected[i]), FormatError(Subject[i]));
+                    .FailWith("Wrong msg for error {0}: expected {1}, got {2}", i, expected[i].Format(), Subject[i].Format());
 
                 Execute.Assertion
                     .ForCondition(Subject[i].Span == expected[i].Span)
-                    .FailWith("Wrong span for error {0}: expected {1}, got {2}", i, FormatError(expected[i]), FormatError(Subject[i]));
+                    .FailWith("Wrong span for error {0}: expected {1}, got {2}", i, expected[i].Format(), Subject[i].Format());
             }
 
             Execute.Assertion
@@ -40,11 +48,5 @@ public AndConstraint<ErrorResultArrayAssertions> HaveErrors(ErrorResult[] expect
 
             return new AndConstraint<ErrorResultArrayAssertions>(this);
         }
-
-        private string FormatError(ErrorResult err) {
-            var s = err.Span.Start;
-            var e = err.Span.End;
-            return $"new ErrorResult(\"{err.Message}\", new SourceSpan({s.Line}, {s.Column}, {e.Line}, {e.Column}))";
-        }
     }
 }