Added additional test case

Author: vweijsters

StyleCop.Analyzers/StyleCop.Analyzers.Test/ReadabilityRules/SA1139UnitTests.cs

@@ -283,6 +283,8 @@ public void TestMethod()
         var x = (long)64 * 1024;
         var y = (double)64 /* test */ * 1024;
         var z = (long) /* test */ 64 * 1024;
+        var a = (double)64 // dividend
+            / (double)4; // divisor
     }
 }
 ";
@@ -295,6 +297,8 @@ public void TestMethod()
         var x = 64L * 1024;
         var y = 64D /* test */ * 1024;
         var z = /* test */ 64L * 1024;
+        var a = 64D // dividend
+            / 4D; // divisor
     }
 }
 ";
@@ -304,6 +308,8 @@ public void TestMethod()
                 Diagnostic().WithLocation(6, 17),
                 Diagnostic().WithLocation(7, 17),
                 Diagnostic().WithLocation(8, 17),
+                Diagnostic().WithLocation(9, 17),
+                Diagnostic().WithLocation(10, 15),
             };
 
             await VerifyCSharpFixAsync(testCode, expectedDiagnosticResult, fixedCode, CancellationToken.None).ConfigureAwait(false);