Add ExpectPing to watch for db Ping calls

sqlmock_before_go18_test.go

@@ -0,0 +1,26 @@
+// +build !go1.8
+
+package sqlmock
+
+import (
+	"fmt"
+	"testing"
+	"time"
+)
+
+func TestSqlmockExpectPingHasNoEffect(t *testing.T) {
+	db, mock, err := New()
+	if err != nil {
+		t.Errorf("an error '%s' was not expected when opening a stub database connection", err)
+	}
+	defer db.Close()
+
+	e := mock.ExpectPing()
+
+	// Methods on the expectation can be called
+	e.WillDelayFor(time.Hour).WillReturnError(fmt.Errorf("an error"))
+
+	if err = mock.ExpectationsWereMet(); err != nil {
+		t.Errorf("expected no error to be returned, but got '%s'", err)
+	}
+}