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Examples and Templates

Peter Andersson
example_chapter.xml

## Test suite example

This example test suite shows some tests of a database server.

`-module(db_data_type_SUITE). -include_lib("common_test/include/ct.hrl"). %% Test server callbacks -export([suite/0, all/0, init_per_suite/1, end_per_suite/1, init_per_testcase/2, end_per_testcase/2]). %% Test cases -export([string/1, integer/1]). -define(CONNECT_STR, "DSN=sqlserver;UID=alladin;PWD=sesame"). %%-------------------------------------------------------------------- %% COMMON TEST CALLBACK FUNCTIONS %%-------------------------------------------------------------------- %%-------------------------------------------------------------------- %% Function: suite() -> Info %% %% Info = [tuple()] %% List of key/value pairs. %% %% Description: Returns list of tuples to set default properties %% for the suite. %%-------------------------------------------------------------------- suite() -> [{timetrap,{minutes,1}}]. %%-------------------------------------------------------------------- %% Function: init_per_suite(Config0) -> Config1 %% %% Config0 = Config1 = [tuple()] %% A list of key/value pairs, holding the test case configuration. %% %% Description: Initialization before the suite. %%-------------------------------------------------------------------- init_per_suite(Config) -> {ok, Ref} = db:connect(?CONNECT_STR, []), TableName = db_lib:unique_table_name(), [{con_ref, Ref },{table_name, TableName}| Config]. %%-------------------------------------------------------------------- %% Function: end_per_suite(Config) -> void() %% %% Config = [tuple()] %% A list of key/value pairs, holding the test case configuration. %% %% Description: Cleanup after the suite. %%-------------------------------------------------------------------- end_per_suite(Config) -> Ref = ?config(con_ref, Config), db:disconnect(Ref), ok. %%-------------------------------------------------------------------- %% Function: init_per_testcase(TestCase, Config0) -> Config1 %% %% TestCase = atom() %% Name of the test case that is about to run. %% Config0 = Config1 = [tuple()] %% A list of key/value pairs, holding the test case configuration. %% %% Description: Initialization before each test case. %%-------------------------------------------------------------------- init_per_testcase(Case, Config) -> Ref = ?config(con_ref, Config), TableName = ?config(table_name, Config), ok = db:create_table(Ref, TableName, table_type(Case)), Config. %%-------------------------------------------------------------------- %% Function: end_per_testcase(TestCase, Config) -> void() %% %% TestCase = atom() %% Name of the test case that is finished. %% Config = [tuple()] %% A list of key/value pairs, holding the test case configuration. %% %% Description: Cleanup after each test case. %%-------------------------------------------------------------------- end_per_testcase(_Case, Config) -> Ref = ?config(con_ref, Config), TableName = ?config(table_name, Config), ok = db:delete_table(Ref, TableName), ok. %%-------------------------------------------------------------------- %% Function: all() -> GroupsAndTestCases %% %% GroupsAndTestCases = [{group,GroupName} | TestCase] %% GroupName = atom() %% Name of a test case group. %% TestCase = atom() %% Name of a test case. %% %% Description: Returns the list of groups and test cases that %% are to be executed. %%-------------------------------------------------------------------- all() -> [string, integer]. %%-------------------------------------------------------------------- %% TEST CASES %%-------------------------------------------------------------------- string(Config) -> insert_and_lookup(dummy_key, "Dummy string", Config). integer(Config) -> insert_and_lookup(dummy_key, 42, Config). insert_and_lookup(Key, Value, Config) -> Ref = ?config(con_ref, Config), TableName = ?config(table_name, Config), ok = db:insert(Ref, TableName, Key, Value), [Value] = db:lookup(Ref, TableName, Key), ok = db:delete(Ref, TableName, Key), [] = db:lookup(Ref, TableName, Key), ok.`

## Test suite templates

The Erlang mode for the Emacs editor includes two Common Test test suite templates, one with extensive information in the function headers, and one with minimal information. A test suite template provides a quick start for implementing a suite from scratch and gives you a good overview of the available callback functions. Here are the templates in question:

Large Common Test suite

`%%%------------------------------------------------------------------- %%% File : example_SUITE.erl %%% Author : %%% Description : %%% %%% Created : %%%------------------------------------------------------------------- -module(example_SUITE). %% Note: This directive should only be used in test suites. -compile(export_all). -include_lib("common_test/include/ct.hrl"). %%-------------------------------------------------------------------- %% COMMON TEST CALLBACK FUNCTIONS %%-------------------------------------------------------------------- %%-------------------------------------------------------------------- %% Function: suite() -> Info %% %% Info = [tuple()] %% List of key/value pairs. %% %% Description: Returns list of tuples to set default properties %% for the suite. %% %% Note: The suite/0 function is only meant to be used to return %% default data values, not perform any other operations. %%-------------------------------------------------------------------- suite() -> [{timetrap,{minutes,10}}]. %%-------------------------------------------------------------------- %% Function: init_per_suite(Config0) -> %% Config1 | {skip,Reason} | {skip_and_save,Reason,Config1} %% %% Config0 = Config1 = [tuple()] %% A list of key/value pairs, holding the test case configuration. %% Reason = term() %% The reason for skipping the suite. %% %% Description: Initialization before the suite. %% %% Note: This function is free to add any key/value pairs to the Config %% variable, but should NOT alter/remove any existing entries. %%-------------------------------------------------------------------- init_per_suite(Config) -> Config. %%-------------------------------------------------------------------- %% Function: end_per_suite(Config0) -> void() | {save_config,Config1} %% %% Config0 = Config1 = [tuple()] %% A list of key/value pairs, holding the test case configuration. %% %% Description: Cleanup after the suite. %%-------------------------------------------------------------------- end_per_suite(_Config) -> ok. %%-------------------------------------------------------------------- %% Function: init_per_group(GroupName, Config0) -> %% Config1 | {skip,Reason} | {skip_and_save,Reason,Config1} %% %% GroupName = atom() %% Name of the test case group that is about to run. %% Config0 = Config1 = [tuple()] %% A list of key/value pairs, holding configuration data for the group. %% Reason = term() %% The reason for skipping all test cases and subgroups in the group. %% %% Description: Initialization before each test case group. %%-------------------------------------------------------------------- init_per_group(_GroupName, Config) -> Config. %%-------------------------------------------------------------------- %% Function: end_per_group(GroupName, Config0) -> %% void() | {save_config,Config1} %% %% GroupName = atom() %% Name of the test case group that is finished. %% Config0 = Config1 = [tuple()] %% A list of key/value pairs, holding configuration data for the group. %% %% Description: Cleanup after each test case group. %%-------------------------------------------------------------------- end_per_group(_GroupName, _Config) -> ok. %%-------------------------------------------------------------------- %% Function: init_per_testcase(TestCase, Config0) -> %% Config1 | {skip,Reason} | {skip_and_save,Reason,Config1} %% %% TestCase = atom() %% Name of the test case that is about to run. %% Config0 = Config1 = [tuple()] %% A list of key/value pairs, holding the test case configuration. %% Reason = term() %% The reason for skipping the test case. %% %% Description: Initialization before each test case. %% %% Note: This function is free to add any key/value pairs to the Config %% variable, but should NOT alter/remove any existing entries. %%-------------------------------------------------------------------- init_per_testcase(_TestCase, Config) -> Config. %%-------------------------------------------------------------------- %% Function: end_per_testcase(TestCase, Config0) -> %% void() | {save_config,Config1} | {fail,Reason} %% %% TestCase = atom() %% Name of the test case that is finished. %% Config0 = Config1 = [tuple()] %% A list of key/value pairs, holding the test case configuration. %% Reason = term() %% The reason for failing the test case. %% %% Description: Cleanup after each test case. %%-------------------------------------------------------------------- end_per_testcase(_TestCase, _Config) -> ok. %%-------------------------------------------------------------------- %% Function: groups() -> [Group] %% %% Group = {GroupName,Properties,GroupsAndTestCases} %% GroupName = atom() %% The name of the group. %% Properties = [parallel | sequence | Shuffle | {RepeatType,N}] %% Group properties that may be combined. %% GroupsAndTestCases = [Group | {group,GroupName} | TestCase] %% TestCase = atom() %% The name of a test case. %% Shuffle = shuffle | {shuffle,Seed} %% To get cases executed in random order. %% Seed = {integer(),integer(),integer()} %% RepeatType = repeat | repeat_until_all_ok | repeat_until_all_fail | %% repeat_until_any_ok | repeat_until_any_fail %% To get execution of cases repeated. %% N = integer() | forever %% %% Description: Returns a list of test case group definitions. %%-------------------------------------------------------------------- groups() -> []. %%-------------------------------------------------------------------- %% Function: all() -> GroupsAndTestCases | {skip,Reason} %% %% GroupsAndTestCases = [{group,GroupName} | TestCase] %% GroupName = atom() %% Name of a test case group. %% TestCase = atom() %% Name of a test case. %% Reason = term() %% The reason for skipping all groups and test cases. %% %% Description: Returns the list of groups and test cases that %% are to be executed. %%-------------------------------------------------------------------- all() -> [my_test_case]. %%-------------------------------------------------------------------- %% TEST CASES %%-------------------------------------------------------------------- %%-------------------------------------------------------------------- %% Function: TestCase() -> Info %% %% Info = [tuple()] %% List of key/value pairs. %% %% Description: Test case info function - returns list of tuples to set %% properties for the test case. %% %% Note: This function is only meant to be used to return a list of %% values, not perform any other operations. %%-------------------------------------------------------------------- my_test_case() -> []. %%-------------------------------------------------------------------- %% Function: TestCase(Config0) -> %% ok | exit() | {skip,Reason} | {comment,Comment} | %% {save_config,Config1} | {skip_and_save,Reason,Config1} %% %% Config0 = Config1 = [tuple()] %% A list of key/value pairs, holding the test case configuration. %% Reason = term() %% The reason for skipping the test case. %% Comment = term() %% A comment about the test case that will be printed in the html log. %% %% Description: Test case function. (The name of it must be specified in %% the all/0 list or in a test case group for the test case %% to be executed). %%-------------------------------------------------------------------- my_test_case(_Config) -> ok.`

Small Common Test suite

`%%%------------------------------------------------------------------- %%% File : example_SUITE.erl %%% Author : %%% Description : %%% %%% Created : %%%------------------------------------------------------------------- -module(example_SUITE). -compile(export_all). -include_lib("common_test/include/ct.hrl"). %%-------------------------------------------------------------------- %% Function: suite() -> Info %% Info = [tuple()] %%-------------------------------------------------------------------- suite() -> [{timetrap,{seconds,30}}]. %%-------------------------------------------------------------------- %% Function: init_per_suite(Config0) -> %% Config1 | {skip,Reason} | {skip_and_save,Reason,Config1} %% Config0 = Config1 = [tuple()] %% Reason = term() %%-------------------------------------------------------------------- init_per_suite(Config) -> Config. %%-------------------------------------------------------------------- %% Function: end_per_suite(Config0) -> void() | {save_config,Config1} %% Config0 = Config1 = [tuple()] %%-------------------------------------------------------------------- end_per_suite(_Config) -> ok. %%-------------------------------------------------------------------- %% Function: init_per_group(GroupName, Config0) -> %% Config1 | {skip,Reason} | {skip_and_save,Reason,Config1} %% GroupName = atom() %% Config0 = Config1 = [tuple()] %% Reason = term() %%-------------------------------------------------------------------- init_per_group(_GroupName, Config) -> Config. %%-------------------------------------------------------------------- %% Function: end_per_group(GroupName, Config0) -> %% void() | {save_config,Config1} %% GroupName = atom() %% Config0 = Config1 = [tuple()] %%-------------------------------------------------------------------- end_per_group(_GroupName, _Config) -> ok. %%-------------------------------------------------------------------- %% Function: init_per_testcase(TestCase, Config0) -> %% Config1 | {skip,Reason} | {skip_and_save,Reason,Config1} %% TestCase = atom() %% Config0 = Config1 = [tuple()] %% Reason = term() %%-------------------------------------------------------------------- init_per_testcase(_TestCase, Config) -> Config. %%-------------------------------------------------------------------- %% Function: end_per_testcase(TestCase, Config0) -> %% void() | {save_config,Config1} | {fail,Reason} %% TestCase = atom() %% Config0 = Config1 = [tuple()] %% Reason = term() %%-------------------------------------------------------------------- end_per_testcase(_TestCase, _Config) -> ok. %%-------------------------------------------------------------------- %% Function: groups() -> [Group] %% Group = {GroupName,Properties,GroupsAndTestCases} %% GroupName = atom() %% Properties = [parallel | sequence | Shuffle | {RepeatType,N}] %% GroupsAndTestCases = [Group | {group,GroupName} | TestCase] %% TestCase = atom() %% Shuffle = shuffle | {shuffle,{integer(),integer(),integer()}} %% RepeatType = repeat | repeat_until_all_ok | repeat_until_all_fail | %% repeat_until_any_ok | repeat_until_any_fail %% N = integer() | forever %%-------------------------------------------------------------------- groups() -> []. %%-------------------------------------------------------------------- %% Function: all() -> GroupsAndTestCases | {skip,Reason} %% GroupsAndTestCases = [{group,GroupName} | TestCase] %% GroupName = atom() %% TestCase = atom() %% Reason = term() %%-------------------------------------------------------------------- all() -> [my_test_case]. %%-------------------------------------------------------------------- %% Function: TestCase() -> Info %% Info = [tuple()] %%-------------------------------------------------------------------- my_test_case() -> []. %%-------------------------------------------------------------------- %% Function: TestCase(Config0) -> %% ok | exit() | {skip,Reason} | {comment,Comment} | %% {save_config,Config1} | {skip_and_save,Reason,Config1} %% Config0 = Config1 = [tuple()] %% Reason = term() %% Comment = term() %%-------------------------------------------------------------------- my_test_case(_Config) -> ok.`