Asserts that the current IScopeContext value has the specified property and
its value deeply (loosly) equals the expected value.
The current IAssertScope assertion scope.
The name of the property to check.
Optionalvalue: any
The expected value of the property.
OptionalevalMsg: MsgSource
The message to display if the assertion fails.
The new "instance" (object) to be used as the this for the chained operations.
An AssertionFailure if the current value does not have the specified property.
An AssertionFailure if the property value does not match the expected value.
Export assertion functions