function test_field_isEditable_simple() {
  var field = new Blockly.Field("Dummy text");
  // EDITABLE is true by default, but without a source block a field can't be
  // edited.
  assertFalse('Field without a block is not editable',
      field.isCurrentlyEditable());
}
@fileoverview Tests for Blockly.Field
@author fenichel@google.com (Rachel Fenichel)