Tests that console correctly groups similar messages.

5[Violation] Verbose-level violation
5[Violation] Error-level violation
ConsoleAPI log
'evaluated command'
'evaluated command'
produce_reference_error
VM:1 Uncaught ReferenceError: produce_reference_error is not defined
    at <anonymous>:1:1
(anonymous) @ VM:1
ConsoleAPI log
'evaluated command'
'evaluated command'
produce_reference_error
VM:1 Uncaught ReferenceError: produce_reference_error is not defined
    at <anonymous>:1:1
(anonymous) @ VM:1
ConsoleAPI log
'evaluated command'
'evaluated command'
produce_reference_error
VM:1 Uncaught ReferenceError: produce_reference_error is not defined
    at <anonymous>:1:1
(anonymous) @ VM:1
ConsoleAPI log
'evaluated command'
'evaluated command'
produce_reference_error
VM:1 Uncaught ReferenceError: produce_reference_error is not defined
    at <anonymous>:1:1
(anonymous) @ VM:1
ConsoleAPI log
'evaluated command'
'evaluated command'
produce_reference_error
VM:1 Uncaught ReferenceError: produce_reference_error is not defined
    at <anonymous>:1:1
(anonymous) @ VM:1


Stop grouping messages:

[Violation] Verbose-level violation
[Violation] Error-level violation
ConsoleAPI log
'evaluated command'
'evaluated command'
produce_reference_error
VM:1 Uncaught ReferenceError: produce_reference_error is not defined
    at <anonymous>:1:1
(anonymous) @ VM:1
[Violation] Verbose-level violation
[Violation] Error-level violation
ConsoleAPI log
'evaluated command'
'evaluated command'
produce_reference_error
VM:1 Uncaught ReferenceError: produce_reference_error is not defined
    at <anonymous>:1:1
(anonymous) @ VM:1
[Violation] Verbose-level violation
[Violation] Error-level violation
ConsoleAPI log
'evaluated command'
'evaluated command'
produce_reference_error
VM:1 Uncaught ReferenceError: produce_reference_error is not defined
    at <anonymous>:1:1
(anonymous) @ VM:1
[Violation] Verbose-level violation
[Violation] Error-level violation
ConsoleAPI log
'evaluated command'
'evaluated command'
produce_reference_error
VM:1 Uncaught ReferenceError: produce_reference_error is not defined
    at <anonymous>:1:1
(anonymous) @ VM:1
[Violation] Verbose-level violation
[Violation] Error-level violation
ConsoleAPI log
'evaluated command'
'evaluated command'
produce_reference_error
VM:1 Uncaught ReferenceError: produce_reference_error is not defined
    at <anonymous>:1:1
(anonymous) @ VM:1