Improved failure message and test

Author: JonPSmith

Test/UnitTests/TestSupport/TestFileData.cs

@@ -1,5 +1,7 @@
+using System;
 using System.Linq;
 using System.Reflection;
+using Microsoft.EntityFrameworkCore;
 using TestSupport.Helpers;
 using Xunit.Extensions.AssertExtensions;
 using Xunit;
@@ -20,6 +22,19 @@ public void TestGetCallerTopLevelDirectory()
             path.ShouldEndWith(this.GetType().Namespace.Split('.').First());
         }
 
+
+        [Fact]
+        public void TestGetCallerTopLevelDirectoryNuGetAssembly()
+        {
+            //SETUP
+
+            //ATTEMPT
+            var ex = Assert.Throws<Exception>(() => TestData.GetCallingAssemblyTopLevelDir(Assembly.GetAssembly(typeof(DbContext))));
+
+            //VERIFY
+            ex.Message.ShouldEqual(@"Did not find '\bin\' in the assembly. Do you need to provide the callingAssembly parameter?");
+        }
+
         [Fact]
         public void TestGetTestDataFileDirectory()
         {

TestSupport/Helpers/TestData.cs

@@ -141,7 +141,7 @@ public static string GetCallingAssemblyTopLevelDir(Assembly callingAssembly = nu
 
             var indexOfPart = pathToManipulate.IndexOf(binDir, StringComparison.OrdinalIgnoreCase)+1;
             if (indexOfPart <= 0)
-                throw new Exception($"Did not find '{binDir}' in the ApplicationBasePath");
+                throw new Exception($"Did not find '{binDir}' in the assembly. Do you need to provide the callingAssembly parameter?");
 
             return pathToManipulate.Substring(0, indexOfPart - 1);
         }