期望变量为空或布尔值

那怎么办

expect(variable === null || typeof variable === 'boolean').toBeTruthy();

你可以用 expect.extend 要将其添加到内置匹配器,请执行以下操作:

expect.extend({
    toBeBooleanOrNull(received) {
        return received === null || typeof received === 'boolean' ? {
            message: () => `expected ${received} to be boolean or null`,
            pass: true
        } : {
            message: () => `expected ${received} to be boolean or null`,
            pass: false
        };
    }
});

使用它就像:

expect(variable).toBeBooleanOrNull();