adding a test case to support empty expectedSQL check

query_test.go

@@ -69,6 +69,7 @@ func TestQueryMatcherRegexp(t *testing.T) {
 		{"SELECT (.+) FROM users", "SELECT name, email FROM users WHERE id = ?", nil},
 		{"Select (.+) FROM users", "SELECT name, email FROM users WHERE id = ?", fmt.Errorf(`could not match actual sql: "SELECT name, email FROM users WHERE id = ?" with expected regexp "Select (.+) FROM users"`)},
 		{"SELECT (.+) FROM\nusers", "SELECT name, email\n FROM users\n WHERE id = ?", nil},
+                {"","SELECT from table", fmt.Errorf(`expectedSQL can't be empty`)},
 	}
 
 	for i, c := range cases {