Improve error message for SchemaValidationException

Author: hazzik

src/NHibernate.Test/Async/NHSpecificTest/NH1274ExportExclude/NH1274ExportExcludeFixture.cs

@@ -95,7 +95,7 @@ public void SchemaExport_Validate_CausesValidateExceptionAsync()
 			Assert.That(
 				() => validator.ValidateAsync(),
 				Throws.TypeOf<SchemaValidationException>()
-				      .And.Message.EqualTo("Schema validation failed: see list of validation errors")
+				      .And.Message.StartsWith("Schema validation failed: see list of validation errors")
 				      .And.Property("ValidationErrors").Contains("Missing table: Home_Validate"));
 		}
 

src/NHibernate.Test/Async/Tools/hbm2ddl/SchemaValidator/PostgresSchemaValidateFixture.cs

@@ -37,7 +37,7 @@ public async Task ShouldBeInvalidIfTimestampTzIsExpectedAndGotTimestampAsync()
 				var validator = new Tool.hbm2ddl.SchemaValidator(expected);
 
 				var error = Assert.ThrowsAsync<SchemaValidationException>(() => validator.ValidateAsync());
-				Assert.That(error, Has.Message.EqualTo("Schema validation failed: see list of validation errors"));
+				Assert.That(error, Has.Message.StartsWith("Schema validation failed: see list of validation errors"));
 				Assert.That(
 					error,
 					Has.Property("ValidationErrors").Some.Contains("Wrong column type").IgnoreCase
@@ -65,7 +65,7 @@ public async Task ShouldBeInvalidIfTimestampIsExpectedAndGotTimestampTzAsync()
 				var validator = new Tool.hbm2ddl.SchemaValidator(expected);
 
 				var error = Assert.ThrowsAsync<SchemaValidationException>(() => validator.ValidateAsync());
-				Assert.That(error, Has.Message.EqualTo("Schema validation failed: see list of validation errors"));
+				Assert.That(error, Has.Message.StartsWith("Schema validation failed: see list of validation errors"));
 				Assert.That(
 					error,
 					Has.Property("ValidationErrors").Some.Contains("Wrong column type").IgnoreCase

src/NHibernate.Test/Async/Tools/hbm2ddl/SchemaValidator/SchemaValidateFixture.cs

@@ -90,7 +90,7 @@ public void ShouldNotVerifyModifiedTableAsync()
 			Assert.That(
 				() => validatorV2.ValidateAsync(),
 				Throws.TypeOf<SchemaValidationException>()
-				      .And.Message.EqualTo("Schema validation failed: see list of validation errors")
+				      .And.Message.StartsWith("Schema validation failed: see list of validation errors")
 				      .And.Property("ValidationErrors").Some.Contains("Missing column: Name in ").IgnoreCase.And.Contains("Version").IgnoreCase);
 		}
 
@@ -103,7 +103,7 @@ public void ShouldNotVerifyMultiModifiedTableAsync()
 
 			var error = Assert.ThrowsAsync<SchemaValidationException>(() => validator.ValidateAsync());
 			Assert.That(error,
-				Has.Message.EqualTo("Schema validation failed: see list of validation errors")
+				Has.Message.StartsWith("Schema validation failed: see list of validation errors")
 					.And.Property("ValidationErrors").Some.Contains("Missing column: Name in ").IgnoreCase.And.Contains("Version").IgnoreCase);
 			Assert.That(error,
 				Has.Property("ValidationErrors").Some.Contains("Missing column: Title in ").IgnoreCase.And.Contains("Version").IgnoreCase);

src/NHibernate.Test/NHSpecificTest/NH1274ExportExclude/NH1274ExportExcludeFixture.cs

@@ -84,7 +84,7 @@ public void SchemaExport_Validate_CausesValidateException()
 			Assert.That(
 				() => validator.Validate(),
 				Throws.TypeOf<SchemaValidationException>()
-				      .And.Message.EqualTo("Schema validation failed: see list of validation errors")
+				      .And.Message.StartsWith("Schema validation failed: see list of validation errors")
 				      .And.Property("ValidationErrors").Contains("Missing table: Home_Validate"));
 		}
 

src/NHibernate.Test/Tools/hbm2ddl/SchemaValidator/PostgresSchemaValidateFixture.cs

@@ -26,7 +26,7 @@ public void ShouldBeInvalidIfTimestampTzIsExpectedAndGotTimestamp()
 				var validator = new Tool.hbm2ddl.SchemaValidator(expected);
 
 				var error = Assert.Throws<SchemaValidationException>(() => validator.Validate());
-				Assert.That(error, Has.Message.EqualTo("Schema validation failed: see list of validation errors"));
+				Assert.That(error, Has.Message.StartsWith("Schema validation failed: see list of validation errors"));
 				Assert.That(
 					error,
 					Has.Property("ValidationErrors").Some.Contains("Wrong column type").IgnoreCase
@@ -54,7 +54,7 @@ public void ShouldBeInvalidIfTimestampIsExpectedAndGotTimestampTz()
 				var validator = new Tool.hbm2ddl.SchemaValidator(expected);
 
 				var error = Assert.Throws<SchemaValidationException>(() => validator.Validate());
-				Assert.That(error, Has.Message.EqualTo("Schema validation failed: see list of validation errors"));
+				Assert.That(error, Has.Message.StartsWith("Schema validation failed: see list of validation errors"));
 				Assert.That(
 					error,
 					Has.Property("ValidationErrors").Some.Contains("Wrong column type").IgnoreCase

src/NHibernate.Test/Tools/hbm2ddl/SchemaValidator/SchemaValidateFixture.cs

@@ -79,7 +79,7 @@ public void ShouldNotVerifyModifiedTable()
 			Assert.That(
 				() => validatorV2.Validate(),
 				Throws.TypeOf<SchemaValidationException>()
-				      .And.Message.EqualTo("Schema validation failed: see list of validation errors")
+				      .And.Message.StartsWith("Schema validation failed: see list of validation errors")
 				      .And.Property("ValidationErrors").Some.Contains("Missing column: Name in ").IgnoreCase.And.Contains("Version").IgnoreCase);
 		}
 
@@ -92,7 +92,7 @@ public void ShouldNotVerifyMultiModifiedTable()
 
 			var error = Assert.Throws<SchemaValidationException>(() => validator.Validate());
 			Assert.That(error,
-				Has.Message.EqualTo("Schema validation failed: see list of validation errors")
+				Has.Message.StartsWith("Schema validation failed: see list of validation errors")
 					.And.Property("ValidationErrors").Some.Contains("Missing column: Name in ").IgnoreCase.And.Contains("Version").IgnoreCase);
 			Assert.That(error,
 				Has.Property("ValidationErrors").Some.Contains("Missing column: Title in ").IgnoreCase.And.Contains("Version").IgnoreCase);

src/NHibernate/SchemaValidationException.cs

@@ -3,6 +3,7 @@
 using System.Collections.ObjectModel;
 using System.Runtime.Serialization;
 using System.Security;
+using System.Text;
 
 namespace NHibernate
 {
@@ -36,8 +37,12 @@ public override string Message
 				var message = base.Message;
 				if (ValidationErrors == null || ValidationErrors.Count == 0)
 					return message;
-				var errors = "ValidationErrors:" + string.Join(Environment.NewLine + "- ", ValidationErrors);
-				return message + Environment.NewLine + errors;
+
+				var sb = new StringBuilder(message).AppendLine().AppendLine("Validation errors:");
+				foreach (var error in ValidationErrors)
+					sb.Append('-').AppendLine(error);
+				
+				return sb.ToString();
 			}
 		}
 	}