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Module OUnit

module OUnit: sig .. end

The OUnit library can be used to implement unittests

To uses this library link with ocamlc oUnit.cmo or ocamlopt oUnit.cmx

Assertions

Assertions are the basic building blocks of unittests.

val assert_failure : string -> 'a

Signals a failure. This will raise an exception with the specified string.

val assert_bool : string -> bool -> unit

Signals a failure when bool is false. The string identifies the failure.

val (@?) : string -> bool -> unit

Shorthand for assert_bool

val assert_string : string -> unit

Signals a failure when the string is non-empty. The string identifies the failure.

val assert_equal : ?cmp:('a -> 'a -> bool) ->
       ?printer:('a -> string) -> ?msg:string -> 'a -> 'a -> unit

Compares two values, when they are not equal a failure is signaled. The cmp parameter can be used to pass a different compare function. This parameter defaults to ( = ). The optional printer can be used to convert the value to string, so a nice error message can be formatted. When msg is also set it can be used to identify the failure.

val assert_raises : ?msg:string -> exn -> (unit -> 'a) -> unit

Asserts if the expected exception was raised. When msg is set it can be used to identify the failure

Skipping tests

In certain condition test can be written but there is no point running it, because they are not significant (missing OS features for example). In this case this is not a failure nor a success. Following function allow you to escape test, just as assertion but without the same error status.

A test skipped is counted as success. A test todo is counted as failure.

val skip_if : bool -> string -> unit

skip cond msg If cond is true, skip the test for the reason explain in msg. * For example skip_if (Sys.os_type = "Win32") "Test a doesn't run on windows".

val todo : string -> unit

The associated test is still to be done, for the reason given.

Compare Functions
val cmp_float : ?epsilon:float -> float -> float -> bool

Compare floats up to a given relative error.

Bracket

A bracket is a functional implementation of the commonly used setUp and tearDown feature in unittests. It can be used like this:

"MyTestCase" >:: (bracket test_set_up test_fun test_tear_down)

val bracket : (unit -> 'a) -> ('a -> 'b) -> ('a -> 'c) -> unit -> 'c
Constructing Tests
type test_fun = unit -> unit

The type of test function

type test =
| TestCase of test_fun
| TestList of test list
| TestLabel of string * test

The type of tests

val (>:) : string -> test -> test

Create a TestLabel for a test

val (>::) : string -> test_fun -> test

Create a TestLabel for a TestCase

val (>:::) : string -> test list -> test

Create a TestLabel for a TestList

Some shorthands which allows easy test construction.

Examples:

val test_decorate : (test_fun -> test_fun) -> test -> test

test_decorate g tst Apply g to test function contains in tst tree.

val test_filter : string list -> test -> test option

test_filter paths tst Filter test based on their path string representation.

Retrieve Information from Tests
val test_case_count : test -> int

Returns the number of available test cases

type node =
| ListItem of int
| Label of string

Types which represent the path of a test

type path = node list

The path to the test (in reverse order).

val string_of_node : node -> string

Make a string from a node

val string_of_path : path -> string

Make a string from a path. The path will be reversed before it is tranlated into a string

val test_case_paths : test -> path list

Returns a list with paths of the test

Performing Tests
type test_result =
| RSuccess of path
| RFailure of path * string
| RError of path * string
| RSkip of path * string
| RTodo of path * string

The possible results of a test

type test_event =
| EStart of path
| EEnd of path
| EResult of test_result

Events which occur during a test run

val perform_test : (test_event -> 'a) -> test -> test_result list

Perform the test, allows you to build your own test runner

val run_test_tt : ?verbose:bool -> test -> test_result list

A simple text based test runner. It prints out information during the test.

val run_test_tt_main : test -> test_result list

Main version of the text based test runner. It reads the supplied command line arguments to set the verbose level and limit the number of test to run