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-rwxr-xr-xtest/etap/100-ref-counter.t114
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diff --git a/test/etap/100-ref-counter.t b/test/etap/100-ref-counter.t
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--- a/test/etap/100-ref-counter.t
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-#!/usr/bin/env escript
-%% -*- erlang -*-
-
-% Licensed under the Apache License, Version 2.0 (the "License"); you may not
-% use this file except in compliance with the License. You may obtain a copy of
-% the License at
-%
-% http://www.apache.org/licenses/LICENSE-2.0
-%
-% Unless required by applicable law or agreed to in writing, software
-% distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-% WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-% License for the specific language governing permissions and limitations under
-% the License.
-
-main(_) ->
- test_util:init_code_path(),
- etap:plan(8),
- case (catch test()) of
- ok ->
- etap:end_tests();
- Other ->
- etap:diag(io_lib:format("Test died abnormally: ~p", [Other])),
- etap:bail(Other)
- end,
- ok.
-
-loop() ->
- receive
- close -> ok
- end.
-
-wait() ->
- receive
- {'DOWN', _, _, _, _} -> ok
- after 1000 ->
- throw(timeout_error)
- end.
-
-test() ->
- {ok, RefCtr} = couch_ref_counter:start([]),
-
- etap:is(
- couch_ref_counter:count(RefCtr),
- 1,
- "A ref_counter is initialized with the calling process as a referer."
- ),
-
- ChildPid1 = spawn(fun() -> loop() end),
-
- % This is largely implicit in that nothing else breaks
- % as ok is just returned from gen_server:cast()
- etap:is(
- couch_ref_counter:drop(RefCtr, ChildPid1),
- ok,
- "Dropping an unknown Pid is ignored."
- ),
-
- couch_ref_counter:add(RefCtr, ChildPid1),
- etap:is(
- couch_ref_counter:count(RefCtr),
- 2,
- "Adding a Pid to the ref_counter increases it's count."
- ),
-
- couch_ref_counter:add(RefCtr, ChildPid1),
- etap:is(
- couch_ref_counter:count(RefCtr),
- 2,
- "Readding the same Pid maintains the count but increments it's refs."
- ),
-
- couch_ref_counter:drop(RefCtr, ChildPid1),
- etap:is(
- couch_ref_counter:count(RefCtr),
- 2,
- "Droping the doubly added Pid only removes a ref, not a referer."
- ),
-
- couch_ref_counter:drop(RefCtr, ChildPid1),
- etap:is(
- couch_ref_counter:count(RefCtr),
- 1,
- "Dropping the second ref drops the referer."
- ),
-
- couch_ref_counter:add(RefCtr, ChildPid1),
- etap:is(
- couch_ref_counter:count(RefCtr),
- 2,
- "Sanity checking that the Pid was re-added."
- ),
-
- erlang:monitor(process, ChildPid1),
- ChildPid1 ! close,
- wait(),
-
- CheckFun = fun
- (Iter, nil) ->
- case couch_ref_counter:count(RefCtr) of
- 1 -> Iter;
- _ -> nil
- end;
- (_, Acc) ->
- Acc
- end,
- Result = lists:foldl(CheckFun, nil, lists:seq(1, 10000)),
- etap:isnt(
- Result,
- nil,
- "The referer count was decremented automatically on process exit."
- ),
-
- ok.