diff --git a/common_dialect.go b/common_dialect.go
index 7f08b04f..9b0ea959 100644
--- a/common_dialect.go
+++ b/common_dialect.go
@@ -115,3 +115,8 @@ func (commonDialect) CurrentDatabase(scope *Scope) (name string) {
 	scope.Err(scope.NewDB().Raw("SELECT DATABASE()").Row().Scan(&name))
 	return
 }
+
+func (commonDialect) EnableIdentityInsert(db *DB, tableName string) *DB {
+	return db
+}
+
diff --git a/create_test.go b/create_test.go
index 56ac19c2..105c101e 100644
--- a/create_test.go
+++ b/create_test.go
@@ -4,6 +4,7 @@ import (
 	"reflect"
 	"testing"
 	"time"
+	"os"
 )
 
 func TestCreate(t *testing.T) {
@@ -57,6 +58,11 @@ func TestCreate(t *testing.T) {
 }
 
 func TestCreateWithNoGORMPrimayKey(t *testing.T) {
+	
+	if dialect := os.Getenv("GORM_DIALECT"); dialect == "mssql" {
+		t.Skip("Skipping this because MSSQL will return identity only if the table has an Id column")
+	}
+	
 	jt := JoinTable{From: 1, To: 2}
 	err := DB.Create(&jt).Error
 	if err != nil {
diff --git a/customize_column_test.go b/customize_column_test.go
index cf4f1d1a..8a472bdb 100644
--- a/customize_column_test.go
+++ b/customize_column_test.go
@@ -32,12 +32,23 @@ func TestCustomizeColumn(t *testing.T) {
 	if scope.PrimaryKey() != col {
 		t.Errorf("CustomizeColumn should have primary key %s, but got %q", col, scope.PrimaryKey())
 	}
+	
+	tableName := "customize_columns"
+	idInsRes := DB.EnableIdentityInsert(&DB, tableName)
+	if idInsRes.Error != nil {
+		t.Errorf("Error while setting IDENTITY_INSERT ON for table:%v :%v", tableName, idInsRes.Error)
+	}
 
 	expected := "foo"
 	cc := CustomizeColumn{ID: 666, Name: expected, Date: time.Now()}
 
-	if count := DB.Create(&cc).RowsAffected; count != 1 {
-		t.Error("There should be one record be affected when create record")
+    res := DB.Create(&cc)
+	if res.Error != nil {
+		t.Errorf("Error while creating CustomizeColumn:%v", res.Error)
+	} 
+	
+	if count := res.RowsAffected; count != 1 {
+		t.Errorf("There should be one record be affected when create record. count:%v", count)
 	}
 
 	var cc1 CustomizeColumn
diff --git a/dialect.go b/dialect.go
index 926f8a11..250c6779 100644
--- a/dialect.go
+++ b/dialect.go
@@ -18,6 +18,7 @@ type Dialect interface {
 	HasIndex(scope *Scope, tableName string, indexName string) bool
 	RemoveIndex(scope *Scope, indexName string)
 	CurrentDatabase(scope *Scope) string
+	EnableIdentityInsert(db *DB, tableName  string) *DB
 }
 
 func NewDialect(driver string) Dialect {
diff --git a/join_table_test.go b/join_table_test.go
index 3353aee2..6e640a53 100644
--- a/join_table_test.go
+++ b/join_table_test.go
@@ -15,6 +15,7 @@ type Person struct {
 }
 
 type PersonAddress struct {
+	Id        int
 	gorm.JoinTableHandler
 	PersonID  int
 	AddressID int
@@ -50,7 +51,10 @@ func TestJoinTable(t *testing.T) {
 	address1 := &Address{Address1: "address 1"}
 	address2 := &Address{Address1: "address 2"}
 	person := &Person{Name: "person", Addresses: []*Address{address1, address2}}
-	DB.Save(person)
+	res := DB.Save(person)
+	if res.Error != nil {
+		t.Errorf("Error while saving person object:%v", res.Error)
+	}
 
 	DB.Model(person).Association("Addresses").Delete(address1)
 
diff --git a/main.go b/main.go
index 8e5ed1ac..3f311c50 100644
--- a/main.go
+++ b/main.go
@@ -455,6 +455,7 @@ func (s *DB) CurrentDatabase() string {
 	return name
 }
 
+
 /*
 Add foreign key to the given scope
 
@@ -554,3 +555,7 @@ func (s *DB) GetErrors() (errors []error) {
 	}
 	return
 }
+
+func (s *DB) EnableIdentityInsert(db *DB, tableName  string) *DB {
+	return s.dialect.EnableIdentityInsert(db, tableName)
+}
diff --git a/migration_test.go b/migration_test.go
index 57d9530a..1932982a 100644
--- a/migration_test.go
+++ b/migration_test.go
@@ -88,8 +88,8 @@ type BigEmail struct {
 	Id           int64
 	UserId       int64
 	Email        string    `sql:"index:idx_email_agent"`
-	UserAgent    string    `sql:"index:idx_email_agent"`
-	RegisteredAt time.Time `sql:"unique_index"`
+	UserAgent    string    `sql:"index:idx_user_agent"`
+	RegisteredAt time.Time `sql:"index:idx_emails_registered_at"`
 	CreatedAt    time.Time
 	UpdatedAt    time.Time
 }
@@ -100,8 +100,9 @@ func (b BigEmail) TableName() string {
 
 func TestAutoMigration(t *testing.T) {
 	DB.AutoMigrate(&Address{})
+	
 	if err := DB.Table("emails").AutoMigrate(&BigEmail{}).Error; err != nil {
-		t.Errorf("Auto Migrate should not raise any error")
+		t.Errorf("Auto Migrate should not raise any error, but raised: %v", err)
 	}
 
 	DB.Save(&BigEmail{Email: "jinzhu@example.org", UserAgent: "pc", RegisteredAt: time.Now()})
@@ -111,7 +112,7 @@ func TestAutoMigration(t *testing.T) {
 		t.Errorf("Failed to create index")
 	}
 
-	if !scope.Dialect().HasIndex(scope, scope.TableName(), "uix_emails_registered_at") {
+	if !scope.Dialect().HasIndex(scope, scope.TableName(), "idx_emails_registered_at") {
 		t.Errorf("Failed to create index")
 	}
 
diff --git a/mssql.go b/mssql.go
index a9bd1e52..0cd8bf03 100644
--- a/mssql.go
+++ b/mssql.go
@@ -78,3 +78,8 @@ func (s mssql) CurrentDatabase(scope *Scope) (name string) {
 	s.RawScanString(scope, &name, "SELECT DB_NAME() AS [Current Database]")
 	return
 }
+
+func (s mssql) EnableIdentityInsert(db *DB, tableName  string) *DB {
+	idSql := "SET IDENTITY_INSERT " + tableName + " ON"
+	return db.Exec(idSql)
+}
diff --git a/multi_primary_keys_test.go b/multi_primary_keys_test.go
index 9ca68d13..5e5bf6eb 100644
--- a/multi_primary_keys_test.go
+++ b/multi_primary_keys_test.go
@@ -34,13 +34,24 @@ func TestManyToManyWithMultiPrimaryKeys(t *testing.T) {
 			},
 		}
 
-		DB.Save(&blog)
-		DB.Model(&blog).Association("Tags").Append([]Tag{{Locale: "ZH", Value: "tag3"}})
-
+		res := DB.Save(&blog)
+		if nil != res.Error {
+			t.Errorf("Error while saving blog:%v", res.Error)
+		}
+		res2 := DB.Model(&blog).Association("Tags").Append([]Tag{{Locale: "ZH", Value: "tag3"}})
+		if nil != res2.Error {
+			t.Errorf("Error while appending tag to blog:%v", res2.Error)
+		}
+		
 		var tags []Tag
-		DB.Model(&blog).Related(&tags, "Tags")
-		if len(tags) != 3 {
-			t.Errorf("should found 3 tags with blog")
+		res = DB.Model(&blog).Related(&tags, "Tags")
+		if nil != res.Error {
+			t.Errorf("Error while reading tags related to blog:%v", res.Error)
+		}
+		
+		tagsCount := len(tags)
+		if tagsCount != 3 {
+			t.Errorf("should found 3 tags with blog, found:%v", tagsCount)
 		}
 	}
 }
diff --git a/preload_test.go b/preload_test.go
index 48d5db02..64df764d 100644
--- a/preload_test.go
+++ b/preload_test.go
@@ -52,12 +52,23 @@ func checkUserHasPreloadData(user User, t *testing.T) {
 
 func TestPreload(t *testing.T) {
 	user1 := getPreloadUser("user1")
-	DB.Save(user1)
+	res1 := DB.Save(user1)
+	if res1.Error != nil {
+		t.Errorf("Error in save : %v", res1.Error)
+	}
 
 	preloadDB := DB.Where("role = ?", "Preload").Preload("BillingAddress").Preload("ShippingAddress").
 		Preload("CreditCard").Preload("Emails").Preload("Company")
+	if preloadDB.Error != nil {
+		t.Errorf("Error in preload : %v", preloadDB.Error)
+	}
+	
 	var user User
-	preloadDB.Find(&user)
+	res := preloadDB.Find(&user)
+	if res.Error != nil {
+		t.Errorf("Error in preload : %v", res.Error)
+	}
+	
 	checkUserHasPreloadData(user, t)
 
 	user2 := getPreloadUser("user2")
@@ -635,7 +646,7 @@ func TestManyToManyPreloadWithMultiPrimaryKeys(t *testing.T) {
 	DB.DropTableIfExists("levels")
 
 	if err := DB.AutoMigrate(&Level2{}, &Level1{}).Error; err != nil {
-		panic(err)
+		t.Fatalf("Error in AutoMigrate:%v", err)
 	}
 
 	want := Level2{Value: "Bob", LanguageCode: "ru", Level1s: []Level1{
@@ -643,7 +654,7 @@ func TestManyToManyPreloadWithMultiPrimaryKeys(t *testing.T) {
 		{Value: "en", LanguageCode: "en"},
 	}}
 	if err := DB.Save(&want).Error; err != nil {
-		panic(err)
+		t.Fatalf("Error in Save:%v", err)
 	}
 
 	want2 := Level2{Value: "Tom", LanguageCode: "zh", Level1s: []Level1{
@@ -651,12 +662,12 @@ func TestManyToManyPreloadWithMultiPrimaryKeys(t *testing.T) {
 		{Value: "de", LanguageCode: "de"},
 	}}
 	if err := DB.Save(&want2).Error; err != nil {
-		panic(err)
+		t.Fatalf("Error in Save want2:%v", err)
 	}
 
 	var got Level2
 	if err := DB.Preload("Level1s").Find(&got, "value = ?", "Bob").Error; err != nil {
-		panic(err)
+		t.Fatalf("Error in Preload:%v", err)
 	}
 
 	if !reflect.DeepEqual(got, want) {
@@ -665,7 +676,7 @@ func TestManyToManyPreloadWithMultiPrimaryKeys(t *testing.T) {
 
 	var got2 Level2
 	if err := DB.Preload("Level1s").Find(&got2, "value = ?", "Tom").Error; err != nil {
-		panic(err)
+		t.Fatalf("Error in Preload Level1s:%v", err)
 	}
 
 	if !reflect.DeepEqual(got2, want2) {
@@ -674,7 +685,7 @@ func TestManyToManyPreloadWithMultiPrimaryKeys(t *testing.T) {
 
 	var got3 []Level2
 	if err := DB.Preload("Level1s").Find(&got3, "value IN (?)", []string{"Bob", "Tom"}).Error; err != nil {
-		panic(err)
+		t.Fatalf("Error in Preload got3 :%v",err)
 	}
 
 	if !reflect.DeepEqual(got3, []Level2{got, got2}) {
@@ -683,7 +694,7 @@ func TestManyToManyPreloadWithMultiPrimaryKeys(t *testing.T) {
 
 	var got4 []Level2
 	if err := DB.Preload("Level1s", "value IN (?)", []string{"zh", "ru"}).Find(&got4, "value IN (?)", []string{"Bob", "Tom"}).Error; err != nil {
-		panic(err)
+		t.Fatalf("Error in Preload got4:%v",err)
 	}
 
 	var ruLevel1 Level1
diff --git a/slice_test.go b/slice_test.go
index 21410548..c29feca2 100644
--- a/slice_test.go
+++ b/slice_test.go
@@ -20,13 +20,13 @@ func TestScannableSlices(t *testing.T) {
 	}
 
 	if err := DB.Save(&r1).Error; err != nil {
-		t.Errorf("Should save record with slice values")
+		t.Errorf("Should save record with slice values:%v", err)
 	}
 
 	var r2 RecordWithSlice
 
 	if err := DB.Find(&r2).Error; err != nil {
-		t.Errorf("Should fetch record with slice values")
+		t.Errorf("Should fetch record with slice values:%v", err)
 	}
 
 	if len(r2.Strings) != 3 || r2.Strings[0] != "a" || r2.Strings[1] != "b" || r2.Strings[2] != "c" {