99 lines
3.7 KiB
Elixir
99 lines
3.7 KiB
Elixir
Code.require_file "../test_helper", __FILE__
|
|
|
|
defprotocol ProtocolTest::WithAll, [blank(thing)]
|
|
defprotocol ProtocolTest::WithExcept, [blank(thing)], except: [Atom, Number, List]
|
|
defprotocol ProtocolTest::WithOnly, [blank(thing)], only: [Tuple, Function]
|
|
|
|
defrecord ProtocolTest::Foo, a: 0, b: 0
|
|
|
|
defimpl WithAll, for: Foo do
|
|
def blank(record) do
|
|
record.a + record.b == 0
|
|
end
|
|
end
|
|
|
|
defmodule ProtocolTest do
|
|
use ExUnit::Case
|
|
|
|
def test_protocol_with_all do
|
|
assert_undef(ProtocolTest::WithAll, Atom, :foo)
|
|
assert_undef(ProtocolTest::WithAll, Function, fn(x, do: x))
|
|
assert_undef(ProtocolTest::WithAll, Number, 1)
|
|
assert_undef(ProtocolTest::WithAll, Number, 1.1)
|
|
assert_undef(ProtocolTest::WithAll, List, [])
|
|
assert_undef(ProtocolTest::WithAll, List, [1,2,3])
|
|
assert_undef(ProtocolTest::WithAll, Tuple, {})
|
|
assert_undef(ProtocolTest::WithAll, Tuple, {1,2,3})
|
|
assert_undef(ProtocolTest::WithAll, Tuple, {Bar,2,3})
|
|
assert_undef(ProtocolTest::WithAll, BitString, "foo")
|
|
assert_undef(ProtocolTest::WithAll, BitString, <<1>>)
|
|
assert_undef(ProtocolTest::WithAll, PID, self())
|
|
assert_undef(ProtocolTest::WithAll, Port, hd(:erlang.ports))
|
|
assert_undef(ProtocolTest::WithAll, Reference, make_ref)
|
|
end
|
|
|
|
def test_protocol_with_except do
|
|
assert_undef(ProtocolTest::WithExcept, Any, :foo)
|
|
assert_undef(ProtocolTest::WithExcept, Any, 1)
|
|
assert_undef(ProtocolTest::WithExcept, Any, [1,2,3])
|
|
assert_undef(ProtocolTest::WithExcept, Function, fn(x, do: x))
|
|
assert_undef(ProtocolTest::WithExcept, Tuple, {})
|
|
end
|
|
|
|
def test_protocol_with_only do
|
|
assert_undef(ProtocolTest::WithOnly, Any, :foo)
|
|
assert_undef(ProtocolTest::WithOnly, Any, 1)
|
|
assert_undef(ProtocolTest::WithOnly, Any, [1,2,3])
|
|
assert_undef(ProtocolTest::WithOnly, Function, fn(x, do: x))
|
|
assert_undef(ProtocolTest::WithOnly, Tuple, {})
|
|
end
|
|
|
|
def test_protocol_with_record do
|
|
true = ProtocolTest::WithAll.blank(ProtocolTest::Foo.new)
|
|
false = ProtocolTest::WithAll.blank(ProtocolTest::Foo.new(a: 1))
|
|
end
|
|
|
|
def test_protocol_for do
|
|
assert_protocol_for(ProtocolTest::WithAll, Atom, :foo)
|
|
assert_protocol_for(ProtocolTest::WithAll, Function, fn(x, do: x))
|
|
assert_protocol_for(ProtocolTest::WithAll, Number, 1)
|
|
assert_protocol_for(ProtocolTest::WithAll, Number, 1.1)
|
|
assert_protocol_for(ProtocolTest::WithAll, List, [])
|
|
assert_protocol_for(ProtocolTest::WithAll, List, [1,2,3])
|
|
assert_protocol_for(ProtocolTest::WithAll, Tuple, {})
|
|
assert_protocol_for(ProtocolTest::WithAll, Tuple, {1,2,3})
|
|
assert_protocol_for(ProtocolTest::WithAll, Record, {Bar,2,3})
|
|
assert_protocol_for(ProtocolTest::WithAll, BitString, "foo")
|
|
assert_protocol_for(ProtocolTest::WithAll, BitString, <<1>>)
|
|
assert_protocol_for(ProtocolTest::WithAll, PID, self())
|
|
assert_protocol_for(ProtocolTest::WithAll, Port, hd(:erlang.ports))
|
|
assert_protocol_for(ProtocolTest::WithAll, Reference, make_ref)
|
|
end
|
|
|
|
# Assert that the given protocol is going to be dispatched.
|
|
defp assert_protocol_for(target, impl, thing) do
|
|
joined = target::impl
|
|
assert_equal joined, target.__protocol_for__ thing
|
|
end
|
|
|
|
# Dispatch `blank(thing)` to the given `target`
|
|
# and check if it will dispatch (and successfully fail)
|
|
# to the proper implementation `impl`.
|
|
defp assert_undef(target, impl, thing) do
|
|
try do
|
|
target.blank(thing)
|
|
error("Expected invocation to fail")
|
|
catch: :error, :undef, [stack|_]
|
|
ref = target :: impl
|
|
case hd(stack) do
|
|
match: { ^ref, :blank, [^thing] }
|
|
:ok
|
|
match: { ^ref, :blank, [^thing], []}
|
|
:ok
|
|
else:
|
|
error("Invalid stack #{stack}. Expected: { #{ref}, :blank, [#{thing}] }")
|
|
end
|
|
end
|
|
end
|
|
end
|