function assert(b) {
    if (!b)
        throw new Error("Bad assertion");
}

function test(f) {
    for (let i = 0; i < 100; i++)
        f();
} 

test(function() {
    let error = null;
    let handler = {
        has: function(theTarget, property) {
            assert(error === null); // Make sure we don't call into has more than once. Make sure we throw on the fist error.
            error = new Error;
            throw error;
        }
    };
    let proxy = new Proxy({}, handler);
    let foo = {};

    let threw = false;
    try {
        Object.defineProperty(foo, "foo", proxy);
    } catch(e) {
        threw = true;
        assert(e === error);
    }
    assert(threw);
});

test(function() {
    let error = null;
    let handler = {
        has: function(theTarget, property) {
            assert(error === null); // Make sure we don't call into has more than once. Make sure we throw on the fist error.
            if (property === "set") {
                error = new Error;
                throw error;
            }
            return Reflect.has(theTarget, property);
        }
    };
    let proxy = new Proxy({}, handler);
    let foo = {};

    let threw = false;
    try {
        Object.defineProperty(foo, "foo", proxy);
    } catch(e) {
        threw = true;
        assert(e === error);
    }
    assert(threw);
});

function arrayEq(a, b) {
    if (a.length !== b.length)
        return false;
    for (let i = 0; i < a.length; i++) {
        if (a[i] !== b[i])
            return false;
    }
    return true;

}
test(function() {
    let error = null;
    let hasArray = [];
    let getArray = [];
    let handler = {
        has: function(theTarget, property) {
            hasArray.push(property);
            return Reflect.has(theTarget, property);
        },
        get: function(theTarget, property, receiver) {
            getArray.push(property);
            return Reflect.get(theTarget, property, receiver);
        }
    };

    let target = {
        enumerable: true,
        configurable: true,
        value: 45
    };
    let proxy = new Proxy(target, handler);
    let foo = {};
    Object.defineProperty(foo, "foo", proxy);
    assert(arrayEq(hasArray, ["enumerable", "configurable", "value", "writable", "get", "set"]));
    assert(arrayEq(getArray, ["enumerable", "configurable", "value"]));
    assert(foo.foo === 45);
});

test(function() {
    let error = null;
    let hasArray = [];
    let getArray = [];
    let handler = {
        has: function(theTarget, property) {
            hasArray.push(property);
            return Reflect.has(theTarget, property);
        },
        get: function(theTarget, property, receiver) {
            getArray.push(property);
            return Reflect.get(theTarget, property, receiver);
        }
    };

    let target = {
        enumerable: true,
        configurable: true,
        value: 45,
        writable: true,
        get: function(){},
        set: function(){}
    };
    let proxy = new Proxy(target, handler);
    let foo = {};
    let threw = false;
    try {
        Object.defineProperty(foo, "foo", proxy);
    } catch(e) {
        threw = true;
    }
    assert(threw);
    assert(arrayEq(hasArray, ["enumerable", "configurable", "value", "writable", "get", "set"]));
    assert(arrayEq(hasArray, getArray));
});