When writing tests I frequently write small helpers which are used to
shorten the tests.
Examples:
- when testing mixins I added a module in describe with use Mixin,
some_configuration and created helper that called its injected function
- when testing Phoenix controller I created function that requests a tested
path, given conn as an argument
I noticed that describe blocks don't create module scope so while it looks
like those functions are scoped to given describe, they're shared between
all tests in the file instead.
If implemented, this feature could improve the locality of helpers (so you
don't have to scroll all the way down to see helper's implementation) and
allowed helpers to share the names.
Example:
defmodule DescribeFns do
def foo, do: :foo
def bar, do: 5
end
defmodule DescribeFnsTest do
use ExUnit.Case
describe "foo/0" do
test "foo test" do
assert "foo" == stringify(DescribeFns.foo())
end
defp stringify(atom) do
Atom.to_string(atom)
end
end
describe "bar/0" do
test "bar test" do
assert "5" == stringify(DescribeFns.bar())
end
defp stringify(number) do
Integer.to_string(number)
end
end
end
Compiles with warning:
*$ mix test*
*warning:* this clause for stringify/1 cannot match because a previous
clause at line 15 always matches
test/describe_fns_test.exs:25
And obviously, bar/0 test fails.
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