closes #5

.travis.yml

@@ -2,8 +2,10 @@ language: go
 go:
  - 1.1
  - 1.2
+ - 1.3
  - release
  - tip
 
 script:
+ - go vet ./...
  - go test -v ./...

README.md

@@ -320,6 +320,8 @@ Visit [godoc](http://godoc.org/github.com/DATA-DOG/go-sqlmock)
 
 ## Changes
 
+- **2014-08-14** added **sqlmock.NewErrorResult** which gives an option to return driver.Result with errors for
+interface methods, see [issue](https://github.com/DATA-DOG/go-sqlmock/issues/5)
 - **2014-05-29** allow to match arguments in more sophisticated ways, by providing an **sqlmock.Argument** interface
 - **2014-04-21** introduce **sqlmock.New()** to open a mock database connection for tests. This method
 calls sql.DB.Ping to ensure that connection is open, see [issue](https://github.com/DATA-DOG/go-sqlmock/issues/4).

result.go

@@ -10,21 +10,30 @@ import (
 type result struct {
 	insertID     int64
 	rowsAffected int64
+	err          error
 }
 
 // NewResult creates a new sql driver Result
 // for Exec based query mocks.
 func NewResult(lastInsertID int64, rowsAffected int64) driver.Result {
 	return &result{
-		lastInsertID,
+		insertID:     lastInsertID,
-		rowsAffected,
+		rowsAffected: rowsAffected,
+	}
+}
+
+// NewErrorResult creates a new sql driver Result
+// which returns an error given for both interface methods
+func NewErrorResult(err error) driver.Result {
+	return &result{
+		err: err,
 	}
 }
 
 func (r *result) LastInsertId() (int64, error) {
-	return r.insertID, nil
+	return r.insertID, r.err
 }
 
 func (r *result) RowsAffected() (int64, error) {
-	return r.rowsAffected, nil
+	return r.rowsAffected, r.err
 }

result_test.go

@@ -0,0 +1,36 @@
+package sqlmock
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestShouldReturnValidSqlDriverResult(t *testing.T) {
+	result := NewResult(1, 2)
+	id, err := result.LastInsertId()
+	if 1 != id {
+		t.Errorf("Expected last insert id to be 1, but got: %d", id)
+	}
+	if err != nil {
+		t.Errorf("expected no error, but got: %s", err)
+	}
+	affected, err := result.RowsAffected()
+	if 2 != affected {
+		t.Errorf("Expected affected rows to be 2, but got: %d", affected)
+	}
+	if err != nil {
+		t.Errorf("expected no error, but got: %s", err)
+	}
+}
+
+func TestShouldReturnErroeSqlDriverResult(t *testing.T) {
+	result := NewErrorResult(fmt.Errorf("some error"))
+	_, err := result.LastInsertId()
+	if err == nil {
+		t.Error("expected error, but got none")
+	}
+	_, err = result.RowsAffected()
+	if err == nil {
+		t.Error("expected error, but got none")
+	}
+}