updates travis to validate with go fmt

.travis.yml

@@ -8,9 +8,12 @@ go:
   - 1.6.x
   - 1.7.x
   - 1.8.x
-  - tip
+  # - tip # sadly fails most of thw times
 
-script: go test -race -coverprofile=coverage.txt -covermode=atomic
+script:
+  - go vet
+  - test -z "$(go fmt ./...)" # fail if not formatted properly
+  - go test -race -coverprofile=coverage.txt -covermode=atomic
 
 after_success:
   - bash <(curl -s https://codecov.io/bash)

driver_test.go

@@ -109,4 +109,4 @@ func TestDuplicateNewDSN(t *testing.T) {
 	if _, _, err := NewWithDSN("sqlmock_db_1"); err == nil {
 		t.Error("expected error on NewWithDSN")
 	}
-}
+}

sqlmock.go

@@ -309,9 +309,9 @@ func (c *sqlmock) prepare(query string) (*ExpectedPrepare, error) {
 	var expected *ExpectedPrepare
 	var fulfilled int
 	var ok bool
-	
+
 	query = stripQuery(query)
-	
+
 	for _, next := range c.expected {
 		next.Lock()
 		if next.fulfilled() {
@@ -328,7 +328,7 @@ func (c *sqlmock) prepare(query string) (*ExpectedPrepare, error) {
 			next.Unlock()
 			return nil, fmt.Errorf("call to Prepare statement with query '%s', was not expected, next expectation is: %s", query, next)
 		}
-		
+
 		if pr, ok := next.(*ExpectedPrepare); ok {
 			if pr.sqlRegex.MatchString(query) {
 				expected = pr

sqlmock_test.go

@@ -354,7 +354,6 @@ func TestPreparedQueryExecutions(t *testing.T) {
 	}
 }
 
-
 func TestUnorderedPreparedQueryExecutions(t *testing.T) {
 	t.Parallel()
 	db, mock, err := New()
@@ -369,14 +368,14 @@ func TestUnorderedPreparedQueryExecutions(t *testing.T) {
 		ExpectQuery().
 		WithArgs(5).
 		WillReturnRows(
-		NewRows([]string{"id", "title"}).FromCSVString("5,The quick brown fox"),
-	)
+			NewRows([]string{"id", "title"}).FromCSVString("5,The quick brown fox"),
+		)
 	mock.ExpectPrepare("SELECT (.+) FROM authors WHERE id = ?").
 		ExpectQuery().
 		WithArgs(1).
 		WillReturnRows(
-		NewRows([]string{"id", "title"}).FromCSVString("1,Betty B."),
-	)
+			NewRows([]string{"id", "title"}).FromCSVString("1,Betty B."),
+		)
 
 	var id int
 	var name string