How to make unit test coverage in Erlang

Question

When using Python, I test code coverage using tools such as python coverage, and especially for the django django-nose package, I am looking for an equivalent in Erlang. I already tested eunit and generated my reports with surefire , but I did not find a way to cover the code, does anyone know the tools or methodology for this?

Answer 1

If you rebar just add:

 {cover_enabled, true}. 

on rebar.config

Answer 2

I used a general test to manage test suites, and then in the test spec you can declare a cover spec using a tuple {cover, "path to space"}:

 {include, ["../include"]}. {suites,"../test", all}. {logdir,"../results"}. {cover,"../test/reduce.coverspec"}. 

The cover specification basically defines the level of detail and the list of modules you want to analyze:

 {level, details}. {incl_mods, [calc,calc_store]}. 

then when you run the test, you get an incremental web page with the entire test iteration, which, when done, and for each result and link to the coverage summary, and then your source code, annotated with the amount of time, the line was evaluated.

and annotated source:

 File generated from d:/documents and Settings/xxxxxxx/My Documents/git/calc/ebin/../src/calc_store.erl by COVER 2012-06-01 at 10:23:45 **************************************************************************** | -module(calc_store). | | -behaviour(gen_server). | | -record(state,{var,func}). | -define(SERVER,?MODULE). | | %% gen_server call back | -export([code_change/3,handle_call/3,handle_cast/2,handle_info/2,init/1,terminate/2]). | | %% api | -export([start_link/0,storevar/2,storefunc/4,getvalue/1,getfunc/1,stop/0]). | | %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% | | storevar(Name,Value) -> 1..| gen_server:cast(?MODULE,{storevar,Name,Value}). | | storefunc(Name,Par,Desc,Text) -> 3..| gen_server:cast(?MODULE,{storefunc,Name,Par,Desc,Text}). | | getvalue(Name) -> 67..| gen_server:call(?MODULE,{readvar,Name}). | | getfunc(Name) -> 10..| gen_server:call(?MODULE,{readfunc,Name}). | | stop() -> 0..| gen_server:cast(?MODULE,stop). | | start_link() -> 1..| gen_server:start_link({local, ?SERVER}, ?MODULE, [], []). | | %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% | | init([]) -> | %% register(?MODULE,self()), 1..| {ok,#state{var=dict:new(),func=dict:new()}}. | | handle_call({readvar,Name}, _From, State = #state{var=D}) -> 67..| Reply = dict:find(Name,D), 67..| {reply, Reply, State}; | handle_call({readfunc,Name}, _From, State = #state{func=F}) -> 10..| Reply = dict:find(Name,F) , 10..| {reply, Reply, State}; | handle_call(Request, From, State) -> 0..| io:format("calc_store received call: ~p from ~p~n",[Request,From]), 0..| Reply = ok, 0..| {reply, Reply, State}. | | handle_cast(stop,State) -> 0..| {stop,State}; | handle_cast({storevar,Name,Value}, State = #state{var=D}) -> 1..| NewD= dict:store(Name,Value,D), 1..| {noreply, State#state{var=NewD}}; | handle_cast({storefunc,Name,Par,Desc,Text}, State = #state{func=F}) -> 3..| NewF= dict:store(Name,{Par,Desc,Text},F), 3..| {noreply, State#state{func=NewF}}; | handle_cast(Msg, State) -> 0..| io:format("calc_store received cast: ~p~n",[Msg]), 0..| {noreply, State}. | | handle_info({'EXIT',_P,shutdown},State) -> 0..| {stop,State}; | handle_info(Msg,State) -> 0..| io:format("calc_state received info: ~p~n",[Msg]), 0..| {noreply,State}. | | terminate(_Reason, _State) -> 0..| ok. | | code_change(_OldVsn, State, _Extra) -> 0..| {ok, State}.