erlydtl/src/tests/erlydtl_unittests.erl

-module(erlydtl_unittests).

-export([run_tests/0]).

tests() ->
    [
        {"vars", [
                {"string",
                    <<"String value is: {{ var1 }}">>,
                    [{var1, "foo"}], <<"String value is: foo">>},
                {"int",
                    <<"The magic number is: {{ var1 }}">>,
                    [{var1, 42}], <<"The magic number is: 42">>},
                {"float",
                    <<"The price of milk is: {{ var1 }}">>,
                    [{var1, 0.42}], <<"The price of milk is: 0.42">>},
                {"No spaces",
                    <<"{{var1}}">>,
                    [{var1, "foo"}], <<"foo">>}
            ]},
        {"comment", [
                {"comment block is excised",
                    <<"bob {% comment %}(moron){% endcomment %} loblaw">>,
                    [], <<"bob  loblaw">>},
                {"inline comment is excised",
                    <<"you're {# not #} a very nice person">>,
                    [], <<"you're  a very nice person">>}
            ]},
        {"autoescape", [
                {"Autoescape works",
                    <<"{% autoescape on %}{{ var1 }}{% endautoescape %}">>,
                    [{var1, "<b>bold</b>"}], <<"&lt;b&gt;bold&lt;/b&gt;">>},
                {"Nested autoescape",
                    <<"{% autoescape on %}{{ var1 }}{% autoescape off %}{{ var1 }}{% endautoescape %}{% endautoescape %}">>,
                    [{var1, "<b>"}], <<"&lt;b&gt;<b>">>}
            ]},
        {"string literal", [
                {"Render literal",
                    <<"{{ \"foo\" }} is my name">>, [], <<"foo is my name">>},
                {"Newlines are escaped",
                    <<"{{ \"foo\\n\" }}">>, [], <<"foo\n">>}
            ]},
        {"cycle", [
                {"Cycling through quoted strings",
                    <<"{% for i in test %}{% cycle 'a' 'b' %}{{ i }},{% endfor %}">>,
                    [{test, ["0", "1", "2", "3", "4"]}], <<"a0,b1,a2,b3,a4,">>},
                {"Cycling through normal variables",
                    <<"{% for i in test %}{% cycle aye bee %}{{ i }},{% endfor %}">>,
                    [{test, ["0", "1", "2", "3", "4"]}, {aye, "a"}, {bee, "b"}],
                    <<"a0,b1,a2,b3,a4,">>}
            ]},
        {"number literal", [
                {"Render integer",
                    <<"{{ 5 }}">>, [], <<"5">>}
            ]},
        {"variable", [
                {"Render variable",
                    <<"{{ var1 }} is my game">>, [{var1, "bar"}], <<"bar is my game">>},
                {"Render variable with attribute",
                    <<"I enjoy {{ var1.game }}">>, [{var1, [{game, "Othello"}]}], <<"I enjoy Othello">>},
                {"Render variable with string-key attribute",
                    <<"I also enjoy {{ var1.game }}">>, [{var1, [{"game", "Parcheesi"}]}], <<"I also enjoy Parcheesi">>},
                {"Render variable with binary-key attribute",
                    <<"I also enjoy {{ var1.game }}">>, [{var1, [{<<"game">>, "Parcheesi"}]}], <<"I also enjoy Parcheesi">>},
                {"Render variable in dict",
                    <<"{{ var1 }}">>, dict:store(var1, "bar", dict:new()), <<"bar">>},
                {"Render variable in gb_tree",
                    <<"{{ var1 }}">>, gb_trees:insert(var1, "bar", gb_trees:empty()), <<"bar">>},
                {"Render variable in arity-1 func",
                    <<"I enjoy {{ var1 }}">>, fun (var1) -> "Othello" end, <<"I enjoy Othello">>},
                {"Render variable with attribute in dict",
                    <<"{{ var1.attr }}">>, [{var1, dict:store(attr, "Othello", dict:new())}], <<"Othello">>},
                {"Render variable with attribute in gb_tree",
                    <<"{{ var1.attr }}">>, [{var1, gb_trees:insert(attr, "Othello", gb_trees:empty())}], <<"Othello">>},
                {"Render variable with attribute in arity-1 func",
                    <<"I enjoy {{ var1.game }}">>, [{var1, fun (game) -> "Othello" end}], <<"I enjoy Othello">>},
                {"Render variable in parameterized module",
                    <<"{{ var1.some_var }}">>, [{var1, erlydtl_example_variable_storage:new("foo")}], <<"foo">>},
                {"Nested attributes",
                    <<"{{ person.city.state.country }}">>, [{person, [{city, [{state, [{country, "Italy"}]}]}]}],
                    <<"Italy">>}
            ]},
        {"now", [
               {"now functional",
                  <<"It is the {% now \"jS o\\f F Y\" %}.">>, [{var1, ""}], generate_test_date()}
            ]},
        {"if", [
                {"If/else",
                    <<"{% if var1 %}boo{% else %}yay{% endif %}">>, [{var1, ""}], <<"yay">>},
                {"If",
                    <<"{% if var1 %}boo{% endif %}">>, [{var1, ""}], <<>>},
                {"If not",
                    <<"{% if not var1 %}yay{% endif %}">>, [{var1, ""}], <<"yay">>},
                {"If \"0\"",
                    <<"{% if var1 %}boo{% endif %}">>, [{var1, "0"}], <<>>},
                {"If false",
                    <<"{% if var1 %}boo{% endif %}">>, [{var1, false}], <<>>},
                {"If false string",
                    <<"{% if var1 %}boo{% endif %}">>, [{var1, "false"}], <<"boo">>},
                {"If undefined",
                    <<"{% if var1 %}boo{% endif %}">>, [{var1, undefined}], <<>>},
                {"If other atom",
                    <<"{% if var1 %}yay{% endif %}">>, [{var1, foobar}], <<"yay">>},
                {"If non-empty string",
                    <<"{% if var1 %}yay{% endif %}">>, [{var1, "hello"}], <<"yay">>},
                {"If proplist",
                    <<"{% if var1 %}yay{% endif %}">>, [{var1, [{foo, "bar"}]}], <<"yay">>},
                {"If substring in string",
                    <<"{% if var1 in var2 %}yay{% endif %}">>, [{var1, "rook"}, {var2, "Crooks"}], <<"yay">>},
                {"If substring in string (false)",
                    <<"{% if var1 in var2 %}boo{% endif %}">>, [{var1, "Cook"}, {var2, "Crooks"}], <<>>},
                {"If substring not in string",
                    <<"{% if var1 not in var2 %}yay{% endif %}">>, [{var1, "Cook"}, {var2, "Crooks"}], <<"yay">>},
                {"If substring not in string (false)",
                    <<"{% if var1 not in var2 %}boo{% endif %}">>, [{var1, "rook"}, {var2, "Crooks"}], <<>>},
                {"If literal substring in string",
                    <<"{% if \"man\" in \"Ottoman\" %}yay{% endif %}">>, [], <<"yay">>},
                {"If literal substring in string (false)",
                    <<"{% if \"woman\" in \"Ottoman\" %}boo{% endif %}">>, [], <<>>},
                {"If element in list",
                    <<"{% if var1 in var2 %}yay{% endif %}">>, [{var1, "foo"}, {var2, ["bar", "foo", "baz"]}], <<"yay">>},
                {"If element in list (false)",
                    <<"{% if var1 in var2 %}boo{% endif %}">>, [{var1, "FOO"}, {var2, ["bar", "foo", "baz"]}], <<>>},
                {"If complex",
                    <<"{% if foo.bar.baz %}omgwtfbbq{% endif %}">>, [], <<"">>}
            ]},
        {"for", [
                {"Simple loop",
                    <<"{% for x in list %}{{ x }}{% endfor %}">>, [{'list', ["1", "2", "3"]}],
                    <<"123">>},
                {"Expand list",
                    <<"{% for x, y in list %}{{ x }},{{ y }}\n{% endfor %}">>, [{'list', [["X", "1"], ["X", "2"]]}],
                    <<"X,1\nX,2\n">>},
                {"Expand tuple",
                    <<"{% for x, y in list %}{{ x }},{{ y }}\n{% endfor %}">>, [{'list', [{"X", "1"}, {"X", "2"}]}],
                    <<"X,1\nX,2\n">>},
                {"Resolve variable attribute",
                    <<"{% for number in person.numbers %}{{ number }}\n{% endfor %}">>, [{person, [{numbers, ["411", "911"]}]}],
                    <<"411\n911\n">>},
                {"Resolve nested variable attribute",
                    <<"{% for number in person.home.numbers %}{{ number }}\n{% endfor %}">>, [{person, [{home, [{numbers, ["411", "911"]}]}]}],
                    <<"411\n911\n">>},
                {"Counter0",
                    <<"{% for number in numbers %}{{ forloop.counter0 }}. {{ number }}\n{% endfor %}">>, 
                    [{numbers, ["Zero", "One", "Two"]}], <<"0. Zero\n1. One\n2. Two\n">>},
                {"Counter",
                    <<"{% for number in numbers %}{{ forloop.counter }}. {{ number }}\n{% endfor %}">>, 
                    [{numbers, ["One", "Two", "Three"]}], <<"1. One\n2. Two\n3. Three\n">>},
                {"Reverse Counter0",
                    <<"{% for number in numbers %}{{ forloop.revcounter0 }}. {{ number }}\n{% endfor %}">>, 
                    [{numbers, ["Two", "One", "Zero"]}], <<"2. Two\n1. One\n0. Zero\n">>},
                {"Reverse Counter",
                    <<"{% for number in numbers %}{{ forloop.revcounter }}. {{ number }}\n{% endfor %}">>, 
                    [{numbers, ["Three", "Two", "One"]}], <<"3. Three\n2. Two\n1. One\n">>},
                {"Counter \"first\"",
                    <<"{% for number in numbers %}{% if forloop.first %}{{ number }}{% endif %}{% endfor %}">>,
                    [{numbers, ["One", "Two", "Three"]}], <<"One">>},
                {"Counter \"last\"",
                    <<"{% for number in numbers %}{% if forloop.last %}{{ number }}{% endif %}{% endfor %}">>,
                    [{numbers, ["One", "Two", "Three"]}], <<"Three">>},
                {"Nested for loop",
                    <<"{% for outer in list %}{% for inner in outer %}{{ inner }}\n{% endfor %}{% endfor %}">>,
                    [{'list', [["Al", "Albert"], ["Jo", "Joseph"]]}],
                    <<"Al\nAlbert\nJo\nJoseph\n">>},
                {"Access parent loop counters",
                    <<"{% for outer in list %}{% for inner in outer %}({{ forloop.parentloop.counter0 }}, {{ forloop.counter0 }})\n{% endfor %}{% endfor %}">>,
                    [{'list', [["One", "two"], ["One", "two"]]}], <<"(0, 0)\n(0, 1)\n(1, 0)\n(1, 1)\n">>}
            ]},
        {"ifequal", [
                {"Compare variable to literal",
                    <<"{% ifequal var1 \"foo\" %}yay{% endifequal %}">>,
                    [{var1, "foo"}], <<"yay">>},
                {"Compare variable to unequal literal",
                    <<"{% ifequal var1 \"foo\" %}boo{% endifequal %}">>,
                    [{var1, "bar"}], <<>>},
                {"Compare literal to variable",
                    <<"{% ifequal \"foo\" var1 %}yay{% endifequal %}">>,
                    [{var1, "foo"}], <<"yay">>},
                {"Compare literal to unequal variable",
                    <<"{% ifequal \"foo\" var1 %}boo{% endifequal %}">>,
                    [{var1, "bar"}], <<>>},
                {"Compare variable to literal (int string)",
                    <<"{% ifequal var1 \"2\" %}yay{% else %}boo{% endifequal %}">>,
                    [{var1, "2"}], <<"yay">>},
                {"Compare variable to literal (int)",
                    <<"{% ifequal var1 2 %}yay{% else %}boo{% endifequal %}">>,
                    [{var1, 2}], <<"yay">>},
                {"Compare variable to unequal literal (int)",
                    <<"{% ifequal var1 2 %}boo{% else %}yay{% endifequal %}">>,
                    [{var1, 3}], <<"yay">>},
                {"Compare variable to equal literal (atom)",
                    <<"{% ifequal var1 \"foo\"%}yay{% endifequal %}">>,
                    [{var1, foo}], <<"yay">>},
                {"Compare variable to unequal literal (atom)",
                    <<"{% ifequal var1 \"foo\"%}yay{% else %}boo{% endifequal %}">>,
                    [{var1, bar}], <<"boo">>}
            ]},
        {"ifequal/else", [
                {"Compare variable to literal",
                    <<"{% ifequal var1 \"foo\" %}yay{% else %}boo{% endifequal %}">>,
                    [{var1, "foo"}], <<"yay">>},
                {"Compare variable to unequal literal",
                    <<"{% ifequal var1 \"foo\" %}boo{% else %}yay{% endifequal %}">>,
                    [{var1, "bar"}], <<"yay">>},
                {"Compare literal to variable",
                    <<"{% ifequal \"foo\" var1 %}yay{% else %}boo{% endifequal %}">>,
                    [{var1, "foo"}], <<"yay">>},
                {"Compare literal to unequal variable",
                    <<"{% ifequal \"foo\" var1 %}boo{% else %}yay{% endifequal %}">>,
                    [{var1, "bar"}], <<"yay">>}
            ]},
        {"ifnotequal", [
                {"Compare variable to literal",
                    <<"{% ifnotequal var1 \"foo\" %}boo{% endifnotequal %}">>,
                    [{var1, "foo"}], <<>>},
                {"Compare variable to unequal literal",
                    <<"{% ifnotequal var1 \"foo\" %}yay{% endifnotequal %}">>,
                    [{var1, "bar"}], <<"yay">>},
                {"Compare literal to variable",
                    <<"{% ifnotequal \"foo\" var1 %}boo{% endifnotequal %}">>,
                    [{var1, "foo"}], <<>>},
                {"Compare literal to unequal variable",
                    <<"{% ifnotequal \"foo\" var1 %}yay{% endifnotequal %}">>,
                    [{var1, "bar"}], <<"yay">>}
            ]},
        {"ifnotequal/else", [
                {"Compare variable to literal",
                    <<"{% ifnotequal var1 \"foo\" %}boo{% else %}yay{% endifnotequal %}">>,
                    [{var1, "foo"}], <<"yay">>},
                {"Compare variable to unequal literal",
                    <<"{% ifnotequal var1 \"foo\" %}yay{% else %}boo{% endifnotequal %}">>,
                    [{var1, "bar"}], <<"yay">>},
                {"Compare literal to variable",
                    <<"{% ifnotequal \"foo\" var1 %}boo{% else %}yay{% endifnotequal %}">>,
                    [{var1, "foo"}], <<"yay">>},
                {"Compare literal to unequal variable",
                    <<"{% ifnotequal \"foo\" var1 %}yay{% else %}boo{% endifnotequal %}">>,
                    [{var1, "bar"}], <<"yay">>}
            ]},
       {"filters", [
               {"Filter a literal",
                    <<"{{ \"pop\"|capfirst }}">>, [],
                    <<"Pop">>},
                {"Filters applied in order",
                    <<"{{ var1|force_escape|length }}">>, [{var1, <<"&">>}],
                    <<"5">>},
                {"Escape is applied last",
                    <<"{{ var1|escape|linebreaksbr }}">>, [{var1, <<"\n">>}],
                    <<"&lt;br /&gt;">>},
                {"|add:4",
                    <<"{{ one|add:4 }}">>, [{one, "1"}],
                    <<"5">>},
                {"|capfirst",
                    <<"{{ var1|capfirst }}">>, [{var1, "dana boyd"}], 
                    <<"Dana boyd">>},
                {"|center:10",
                    <<"{{ var1|center:10 }}">>, [{var1, "MB"}], 
                    <<"    MB    ">>},
                {"|center:1",
                    <<"{{ var1|center:1 }}">>, [{var1, "KBR"}], 
                    <<"B">>},
                {"|date 1",
                   <<"{{ var1|date:\"jS F Y H:i\" }}">>,
                   [{var1, {1975,7,24}}],
                   <<"24th July 1975 00:00">>},
                {"|date 2",
                   <<"{{ var1|date:\"jS F Y H:i\" }}">>,
                   [{var1, {{1975,7,24}, {7,13,1}}}],
                   <<"24th July 1975 07:13">>},
                {"|default_if_none:\"foo\"",
                   <<"{{ var1|default_if_none:\"foo\" }}">>, [], <<"foo">>},
                {"|default_if_none:\"foo\" 2",
                    <<"{{ var1|default_if_none:\"foo\" }}">>, [{var1, "bar"}], <<"bar">>},
                {"|escapejs",
                    <<"{{ var1|escapejs }}">>, [{var1, "Skip's \"Old-Timey\" Diner"}], 
                    <<"Skip\\'s \\\"Old-Timey\\\" Diner">>},
                {"|first",
                    <<"{{ var1|first }}">>, [{var1, "James"}], 
                    <<"J">>},
                {"|fix_ampersands",
                    <<"{{ var1|fix_ampersands }}">>, [{var1, "Ben & Jerry's"}], 
                    <<"Ben &amp; Jerry's">>},
                {"|force_escape",
                    <<"{{ var1|force_escape }}">>, [{var1, "Ben & Jerry's <=> \"The World's Best Ice Cream\""}],
                    <<"Ben &amp; Jerry&#039;s &lt;=&gt; &quot;The World&#039;s Best Ice Cream&quot;">>},
                {"|format_integer",
                    <<"{{ var1|format_integer }}">>, [{var1, 28}], <<"28">>},
                {"|format_number 1",
                    <<"{{ var1|format_number }}">>, [{var1, 28}], <<"28">>},
                {"|format_number 2",
                    <<"{{ var1|format_number }}">>, [{var1, 23.77}], <<"23.77">>},
                {"|format_number 3",
                    <<"{{ var1|format_number }}">>, [{var1, "28.77"}], <<"28.77">>},
                {"|format_number 4",
                    <<"{{ var1|format_number }}">>, [{var1, "23.77"}], <<"23.77">>},
                {"|format_number 5",
                    <<"{{ var1|format_number }}">>, [{var1, fun() -> 29 end}], <<"29">>},
                {"|format_number 6",
                    <<"{{ var1|format_number }}">>, [{var1, fun() -> fun() -> 31 end end}], <<"31">>},
                {"|join:\", \" (list)",
                    <<"{{ var1|join:\", \" }}">>, [{var1, ["Liberte", "Egalite", "Fraternite"]}],
                    <<"Liberte, Egalite, Fraternite">>},
                {"|join:\", \" (binary)",
                    <<"{{ var1|join:\", \" }}">>, [{var1, [<<"Liberte">>, "Egalite", <<"Fraternite">>]}],
                    <<"Liberte, Egalite, Fraternite">>},
                {"|last",
                    <<"{{ var1|last }}">>, [{var1, "XYZ"}],
                    <<"Z">>},
                {"|length",
                    <<"{{ var1|length }}">>, [{var1, "antidisestablishmentarianism"}],
                    <<"28">>},
                {"|linebreaksbr",
                    <<"{{ var1|linebreaksbr }}">>, [{var1, "One\nTwo\n\nThree\n\n\n"}],
                    <<"One<br />Two<br /><br />Three<br /><br /><br />">>},
                {"|linebreaksbr",
                    <<"{{ \"One\\nTwo\\n\\nThree\\n\\n\\n\"|linebreaksbr }}">>, [],
                    <<"One<br />Two<br /><br />Three<br /><br /><br />">>},
                {"|ljust:10",
                    <<"{{ var1|ljust:10 }}">>, [{var1, "Gore"}],
                    <<"Gore      ">>},
                {"|lower",
                    <<"{{ var1|lower }}">>, [{var1, "E. E. Cummings"}],
                    <<"e. e. cummings">>},
                {"|rjust:10",
                    <<"{{ var1|rjust:10 }}">>, [{var1, "Bush"}],
                    <<"      Bush">>},
                {"|truncatewords:0",
                    <<"{{ var1|truncatewords:0 }}">>, [{var1, "Empty Me"}],
                    <<"">>},
                {"|truncatewords:2",
                    <<"{{ var1|truncatewords:2 }}">>, [{var1, "Truncate Me Please"}],
                    <<"Truncate Me...">>},
                {"|truncatewords:3",
                    <<"{{ var1|truncatewords:3 }}">>, [{var1, "Don't Truncate Me"}],
                    <<"Don't Truncate Me">>},
                {"|upper",
                    <<"{{ message|upper }}">>, [{message, "That man has a gun."}],
                    <<"THAT MAN HAS A GUN.">>},
                {"|urlencode",
                    <<"{{ url|urlencode }}">>, [{url, "You #$*@!!"}],
                    <<"You+%23%24%2A%40%21%21">>}
            ]},
        {"filters_if", [
                {"Filter if 1.1",
                    <<"{% if var1|length_is:0 %}Y{% else %}N{% endif %}">>,
                     [{var1, []}],
                     <<"Y">>},
                {"Filter if 1.2",
                    <<"{% if var1|length_is:1 %}Y{% else %}N{% endif %}">>,
                     [{var1, []}],
                     <<"N">>},
                {"Filter if 1.3",
                    <<"{% if var1|length_is:7 %}Y{% else %}N{% endif %}">>,
                     [{var1, []}],
                     <<"N">>},
                {"Filter if 2.1",
                    <<"{% if var1|length_is:0 %}Y{% else %}N{% endif %}">>,
                     [{var1, ["foo"]}],
                     <<"N">>},
                {"Filter if 2.2",
                    <<"{% if var1|length_is:1 %}Y{% else %}N{% endif %}">>,
                     [{var1, ["foo"]}],
                     <<"Y">>},
                {"Filter if 2.3",
                    <<"{% if var1|length_is:7 %}Y{% else %}N{% endif %}">>,
                     [{var1, ["foo"]}],
                     <<"N">>},
                {"Filter if 3.1",
                    <<"{% ifequal var1|length 0 %}Y{% else %}N{% endifequal %}">>,
                     [{var1, []}],
                     <<"Y">>},
                {"Filter if 3.1",
                    <<"{% ifequal var1|length 1 %}Y{% else %}N{% endifequal %}">>,
                     [{var1, []}],
                     <<"N">>},
                {"Filter if 4.1",
                    <<"{% ifequal var1|length 3 %}Y{% else %}N{% endifequal %}">>,
                     [{var1, ["foo", "bar", "baz"]}],
                     <<"Y">>},
                {"Filter if 4.2",
                    <<"{% ifequal var1|length 0 %}Y{% else %}N{% endifequal %}">>,
                     [{var1, ["foo", "bar", "baz"]}],
                     <<"N">>},
                {"Filter if 4.3",
                    <<"{% ifequal var1|length 1 %}Y{% else %}N{% endifequal %}">>,
                     [{var1, ["foo", "bar", "baz"]}],
                     <<"N">>}
        ]},
    {"firstof", [
            {"Firstof first",
                <<"{% firstof foo bar baz %}">>,
                [{foo, "1"},{bar, "2"}],
                <<"1">>},
            {"Firstof second",
                <<"{% firstof foo bar baz %}">>,
                [{bar, "2"}],
                <<"2">>},
            {"Firstof none",
                <<"{% firstof foo bar baz %}">>,
                [],
                <<"">>},
            {"Firstof complex",
                <<"{% firstof foo.bar.baz bar %}">>,
                [{foo, [{bar, [{baz, "quux"}]}]}],
                <<"quux">>},
            {"Firstof undefined complex",
                <<"{% firstof foo.bar.baz bar %}">>,
                [{bar, "bar"}],
                <<"bar">>},
            {"Firstof literal",
                <<"{% firstof foo bar \"baz\" %}">>,
                [],
                <<"baz">>}
        ]}
    ].

run_tests() ->
    io:format("Running unit tests...~n"),
    Failures = lists:foldl(
        fun({Group, Assertions}, GroupAcc) ->
                io:format(" Test group ~p...~n", [Group]),
                lists:foldl(fun({Name, DTL, Vars, Output}, Acc) ->
                            case erlydtl:compile(DTL, erlydtl_running_test, []) of
                                {ok, _} ->
                                    {ok, IOList} = erlydtl_running_test:render(Vars),
                                    {ok, IOListBin} = erlydtl_running_test:render(vars_to_binary(Vars)),
                                    case {iolist_to_binary(IOList), iolist_to_binary(IOListBin)} of
                                        {Output, Output} ->
                                            Acc;
                                        {Output, Unexpected} ->
                                            [{Group, Name, 'binary', Unexpected, Output} | Acc];
                                        {Unexpected, Output} ->
                                            [{Group, Name, 'list', Unexpected, Output} | Acc];
                                        {Unexpected1, Unexpected2} ->
                                            [{Group, Name, 'list', Unexpected1, Output}, 
                                                {Group, Name, 'binary', Unexpected2, Output} | Acc]
                                    end;
                                Err ->
                                    [{Group, Name, Err} | Acc]
                            end
                    end, GroupAcc, Assertions)
        end, [], tests()),
    
    io:format("Unit test failures: ~p~n", [Failures]).

vars_to_binary(Vars) when is_list(Vars) ->
    lists:map(fun
            ({Key, [H|_] = Value}) when is_tuple(H) ->
                {Key, vars_to_binary(Value)};
            ({Key, [H|_] = Value}) when is_integer(H) ->
                {Key, list_to_binary(Value)};
            ({Key, Value}) ->
                {Key, Value}
        end, Vars);
vars_to_binary(Vars) ->
    Vars.

generate_test_date() ->
    {{Y,M,D}, _} = erlang:localtime(),
    MonthName = [
       "January", "February", "March", "April",
       "May", "June", "July", "August", "September",
       "October", "November", "December"
    ],
    OrdinalSuffix = [
       "st","nd","rd","th","th","th","th","th","th","th", % 1-10
       "th","th","th","th","th","th","th","th","th","th", % 10-20
       "st","nd","rd","th","th","th","th","th","th","th", % 20-30
       "st"
    ],
    list_to_binary([
         "It is the ",
         integer_to_list(D),
         lists:nth(D, OrdinalSuffix),
         " of ", lists:nth(M, MonthName),
         " ", integer_to_list(Y), "."
    ]).