Two-fer: Implemented two-fer as in #197.

config.json

@@ -192,6 +192,16 @@
 
       ]
     },
+    {
+      "uuid": "1a8abaa2-04f5-0e80-7986-5fb33995971caeb1496",
+      "slug": "two-fer",
+      "core": false,
+      "unlocked_by": null,
+      "difficulty": 3,
+      "topics": [
+
+      ]
+    },
     {
       "uuid": "a2d4ca29-54e2-4969-bfc9-ee483acf9caf",
       "slug": "robot-simulator",

exercises/two-fer/README.md

@@ -0,0 +1,19 @@
+`Two-fer` or `2-fer` is short for two for one. One for you and one for me.
+
+```text
+"One for X, one for me."
+```
+
+When X is a name or "you".
+
+If the given name is "Alice", the result should be "One for Alice, one for me."
+If no name is given, the result should be "One for you, one for me."
+
+## Instructions
+
+Submissions are encouraged to be general, within reason. Having said that, it's
+also important not to over-engineer a solution.
+
+It's important to remember that the goal is to make code as expressive and
+readable as we can.
+

exercises/two-fer/include/exercism.hrl

@@ -0,0 +1,11 @@
+-include_lib("eunit/include/eunit.hrl").
+
+sut(Module) ->
+  {ok, Files} = file:list_dir("./src"),
+  case lists:member("example.erl", Files) of
+    true  -> example;
+    false -> Module
+  end.
+
+version_test() ->
+  ?assertMatch(?TEST_VERSION, ?TESTED_MODULE:test_version()).

exercises/two-fer/rebar.config

@@ -0,0 +1,30 @@
+%% Erlang compiler options
+{erl_opts, [debug_info]}.
+
+{deps, []}.
+
+{dialyzer, [
+  {warnings, [underspecs, no_return]},
+  {get_warnings, true},
+  {plt_apps, top_level_deps}, % top_level_deps | all_deps
+  {plt_extra_apps, []},
+  {plt_location, local}, % local | "/my/file/name"
+  {plt_prefix, "rebar3"},
+  {base_plt_apps, [stdlib, kernel, crypto]},
+  {base_plt_location, global}, % global | "/my/file/name"
+  {base_plt_prefix, "rebar3"}
+]}.
+
+%% eunit:test(Tests)
+{eunit_tests, []}.
+%% Options for eunit:test(Tests, Opts)
+{eunit_opts, [verbose]}.
+
+%% == xref ==
+
+{xref_warnings, true}.
+
+%% xref checks to run
+{xref_checks, [undefined_function_calls, undefined_functions,
+  locals_not_used, exports_not_used,
+  deprecated_function_calls, deprecated_functions]}.

exercises/two-fer/src/example.erl

@@ -0,0 +1,11 @@
+-module(example).
+-export([two_fer/1, two_fer/0, test_version/0]).
+
+two_fer() ->
+  "One for you, one for me.".
+
+two_fer(Name) ->
+  lists:flatten(io_lib:format("One for ~s, one for me.", [Name])).
+
+test_version() ->
+  1.

exercises/two-fer/src/two_fer.app.src

@@ -0,0 +1,9 @@
+{application, two_fer,
+  [{description, "exercism.io - two-fer"},
+    {vsn, "0.0.1"},
+    {modules, []},
+    {registered, []},
+    {applications, [kernel,
+      stdlib]},
+    {env, []}
+  ]}.

exercises/two-fer/src/two_fer.erl

@@ -0,0 +1,11 @@
+-module(two_fer).
+
+-export([two_fer/1, two_fer/0, test_version/0]).
+
+two_fer() ->
+  undefined.
+
+two_fer(Name) ->
+  undefined.
+
+test_version() -> 1.

exercises/two-fer/test/two_fer_tests.erl

@@ -0,0 +1,15 @@
+-module(two_fer_tests).
+
+-define(TESTED_MODULE, (sut(two_fer))).
+-define(TEST_VERSION, 1).
+-include("exercism.hrl").
+
+
+say_you_test() ->
+  ?assertEqual("One for you, one for me.", ?TESTED_MODULE:two_fer()).
+
+say_alice_test() ->
+  ?assertEqual("One for Alice, one for me.", ?TESTED_MODULE:two_fer("Alice")).
+
+say_bob_test() ->
+  ?assertEqual("One for Bob, one for me.", ?TESTED_MODULE:two_fer("Bob")).