[ 'label' => 'equals', 'expr' => 'eq', 'negate_expr' => 'neq', ], '!=' => [ 'label' => 'not equal', 'expr' => 'neq', 'negate_expr' => 'eq', ], ]; $defaultOperators = [ 'equals' => '=', ]; $event = new FieldOperatorsEvent($type, $field, $allOperators, $defaultOperators); $this->assertSame($type, $event->getType()); $this->assertSame($field, $event->getField()); $this->assertSame($defaultOperators, $event->getOperators()); $event->addOperator('!='); $this->assertSame(['equals' => '=', 'not equal' => '!='], $event->getOperators()); } }