Add tests for behavior of preprocessor lines

Author: sharwell

StyleCop.Analyzers/StyleCop.Analyzers.Test/OrderingRules/SA1200UnitTests.cs

@@ -128,6 +128,70 @@ namespace TestNamespace
             await this.VerifyCSharpFixAsync(testCode, fixedTestCode).ConfigureAwait(false);
         }
 
+        [Fact]
+        public async Task TestInvalidUsingStatementsInCompilationUnitWithPragmaAsync()
+        {
+            var testCode = @"#pragma warning disable 1573 // Comment
+using System;
+using System.Threading;
+
+namespace TestNamespace
+{
+}
+";
+
+            var fixedTestCode = @"namespace TestNamespace
+{
+#pragma warning disable 1573 // Comment
+    using System;
+    using System.Threading;
+}
+";
+
+            DiagnosticResult[] expectedResults =
+            {
+                this.CSharpDiagnostic(SA1200UsingDirectivesMustBePlacedCorrectly.DescriptorInside).WithLocation(2, 1),
+                this.CSharpDiagnostic(SA1200UsingDirectivesMustBePlacedCorrectly.DescriptorInside).WithLocation(3, 1),
+            };
+
+            await this.VerifyCSharpDiagnosticAsync(testCode, expectedResults, CancellationToken.None).ConfigureAwait(false);
+            await this.VerifyCSharpDiagnosticAsync(fixedTestCode, EmptyDiagnosticResults, CancellationToken.None).ConfigureAwait(false);
+            await this.VerifyCSharpFixAsync(testCode, fixedTestCode).ConfigureAwait(false);
+        }
+
+        [Fact]
+        public async Task TestInvalidUsingStatementsInCompilationUnitWithRegionBeforeAsync()
+        {
+            var testCode = @"#region Comment
+#endregion Comment
+using System;
+using System.Threading;
+
+namespace TestNamespace
+{
+}
+";
+
+            var fixedTestCode = @"namespace TestNamespace
+{
+    #region Comment
+    #endregion Comment
+    using System;
+    using System.Threading;
+}
+";
+
+            DiagnosticResult[] expectedResults =
+            {
+                this.CSharpDiagnostic(SA1200UsingDirectivesMustBePlacedCorrectly.DescriptorInside).WithLocation(3, 1),
+                this.CSharpDiagnostic(SA1200UsingDirectivesMustBePlacedCorrectly.DescriptorInside).WithLocation(4, 1),
+            };
+
+            await this.VerifyCSharpDiagnosticAsync(testCode, expectedResults, CancellationToken.None).ConfigureAwait(false);
+            await this.VerifyCSharpDiagnosticAsync(fixedTestCode, EmptyDiagnosticResults, CancellationToken.None).ConfigureAwait(false);
+            await this.VerifyCSharpFixAsync(testCode, fixedTestCode).ConfigureAwait(false);
+        }
+
         [Fact]
         [WorkItem(2363, "https://github.com/DotNetAnalyzers/StyleCopAnalyzers/issues/2363")]
         public async Task TestInvalidUsingStatementsWithFileHeaderTriviaAsync()