[Proporsal] Add argument "count times" to assert_receive

[Anastasiya Dyachenko]

Hi,

In tests often face with need to write code like

```

assert_receive {"msg", _}

assert_receive {"msg", _}

assert_receive {"msg", _}

```

where same messages or same matching messages expected to receive multiple times.

It would be match better to have ability to set number of times message must be received, like

```

assert_receive {"msg", _}, 5_000, "message", 3

```

or

```

assert_receive {"msg", _}, times: 3, timeout: 5_000, message: "message"

```

Thanks

[Sven Gehring]

Hi,

Assuming you want to receive the same message, wouldn't this only be slightly shorter than using

```

for _ <- 1..3, do: assert_receive({"msg", _})

```

- Sven

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[Anastasiya Dyachenko]

Looks nice, but if there will be an error, then line number in error message will say nothing. 

But if it would be native function, then it might have special error message, like

"Message ... received only 2 times, expected 3"

четверг, 6 декабря 2018 г., 16:31:57 UTC+3 пользователь Sven Gehring написал:

[Fernando Tapia Rico]

I think you could use the "failure_message" argument for that:

for times <- 0..2, do: assert_receive({"msg", _}, 100, "message received only #{times}, expected 3")

[Anastasiya Dyachenko]

Then in failure message would be no output from process mailbox which in future will show diff with expected message https://github.com/elixir-lang/elixir/pull/8440

четверг, 6 декабря 2018 г., 19:46:27 UTC+3 пользователь Fernando Tapia Rico написал: