expect(parse({}, "")).to.equal('')
expect(parse({
"name": "张三"
}, "{name}")).to.equal('张三')
expect(parse({}, "sum(1,2)")).to.equal(3)
expect(parse({
"age": 20
}, "sum({age},2)")).to.equal(22)
expect(parse({
"score": 80
}, "condition({score}>60,'及格','不及格')")).to.equal("及格")