property-reference-self-assignment.js

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var hits = 0;

var p = { toString() { hits++; return "prop" } };

var obj = { foo: 1 };

var ops = [["obj[p]++", 2],

           ["++obj[p]", 2],

           ["--obj[p]", 0],

           ["obj[p]--", 0],

           ["obj[p] += 2", 3],

           ["obj[p] -= 2", -1],

           ["obj[p] *= 2", 2],

           ["obj[p] /= 2", 0.5],

           ["obj[p] %= 2", 1],

           ["obj[p] >>>= 2", 0],

           ["obj[p] >>= 2", 0],

           ["obj[p] <<= 2", 4],

           ["obj[p] |= 2", 3],

           ["obj[p] ^= 2", 3],

           ["obj[p] &= 2", 0]];

var testHits = 0;

for (let op of ops) {

    // Seed the value for each test.

    obj.prop = 1;

    // Do the operation.

    eval(op[0]);

    assertEq(obj.prop, op[1], `value for ${op[0]}`);

    // We should always call toString once, for each operation.

    testHits++;

    assertEq(hits, testHits, `toString calls for ${op[0]}`);

if (typeof reportCompare === 'function')

    reportCompare(0,0,"OK");