CSE2410 Fall 2014 Bounce

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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// Test the handling of initialization of deleted const variables.

// This only makes sense in local scopes since the declaration and

// initialization of consts in the global scope happen at the same

// time.

function testIntroduceGlobal() {

  var source =

      // Deleting 'x' removes the local const property.

      "delete x;" +

      // Initialization turns into assignment to global 'x'.

      "const x = 3; assertEquals(3, x);" +

      // No constness of the global 'x'.

      "x = 4; assertEquals(4, x);";

  eval(source);

}

testIntroduceGlobal();

assertEquals(4, x);

function testAssignExistingGlobal() {

  var source =

      // Delete 'x' to remove the local const property.

      "delete x;" +

      // Initialization turns into assignment to global 'x'.

      "const x = 5; assertEquals(5, x);" +

      // No constness of the global 'x'.

      "x = 6; assertEquals(6, x);";

  eval(source);

}

testAssignExistingGlobal();

assertEquals(6, x);

function testAssignmentArgument(x) {

  function local() {

    var source = "delete x; const x = 7; assertEquals(7, x)";

    eval(source);

  }

  local();

  assertEquals(7, x);

}

testAssignmentArgument();

assertEquals(6, x);

__defineSetter__('x', function() { throw 42; });

function testAssignGlobalThrows() {

  // Initialization turns into assignment to global 'x' which

  // throws an exception.

  var source = "delete x; const x = 8";

  eval(source);

}

assertThrows("testAssignGlobalThrows()");

function testInitFastCaseExtension() {

  var source = "const x = 9; assertEquals(9, x); x = 10; assertEquals(9, x)";

  eval(source);

}

testInitFastCaseExtension();

function testInitSlowCaseExtension() {

  var source = "";

  // Introduce 100 properties on the context extension object to force

  // it in slow case.

  for (var i = 0; i < 100; i++) source += ("var a" + i + " = i;");

  source += "const x = 10; assertEquals(10, x); x = 11; assertEquals(10, x)";

  eval(source);

}

testInitSlowCaseExtension();

function testAssignSurroundingContextSlot() {

  var x = 12;

  function local() {

    var source = "delete x; const x = 13; assertEquals(13, x)";

    eval(source);

  }

  local();

  assertEquals(13, x);

}

testAssignSurroundingContextSlot();