From: Brendan Higgins brendanhiggins@google.com
Introduce basic class mocking, the ability to automatically generate a Linux C-style class implementation whose behavior is controlled by test cases, which can also set expectations on when and how mocks are called.
Co-developed-by: Daniel Latypov dlatypov@google.com Signed-off-by: Daniel Latypov dlatypov@google.com Signed-off-by: Brendan Higgins brendanhiggins@google.com --- include/kunit/mock.h | 433 +++++++++++++++++++++++++++++++++ lib/kunit/Makefile | 5 +- lib/kunit/kunit-example-test.c | 90 +++++++ lib/kunit/mock-macro-test.c | 91 +++++++ lib/kunit/mock-test.c | 320 ++++++++++++++++++++++++ 5 files changed, 937 insertions(+), 2 deletions(-) create mode 100644 lib/kunit/mock-test.c
diff --git a/include/kunit/mock.h b/include/kunit/mock.h index 13fdeb8730b5..43f797c7e8bb 100644 --- a/include/kunit/mock.h +++ b/include/kunit/mock.h @@ -123,6 +123,439 @@ struct mock_expectation *mock_add_matcher(struct mock *mock, struct mock_param_matcher *matchers[], int len);
+#define MOCK(name) name##_mock + +/** + * KUNIT_EXPECT_CALL() - Declares a *call expectation* on a mock function. + * @expectation_call: a mocked method or function with parameters replaced with + * matchers. + * + * Example: + * + * .. code-block:: c + * + * // Class to mock. + * struct example { + * int (*foo)(struct example *, int); + * }; + * + * // Define the mock. + * DECLARE_STRUCT_CLASS_MOCK_PREREQS(example); + * + * DEFINE_STRUCT_CLASS_MOCK(METHOD(foo), CLASS(example), + * RETURNS(int), + * PARAMS(struct example *, int)); + * + * static int example_init(struct MOCK(example) *mock_example) + * { + * struct example *example = mock_get_trgt(mock_example); + * + * example->foo = foo; + * return 0; + * } + * + * DEFINE_STRUCT_CLASS_MOCK_INIT(example, example_init); + * + * static void foo_example_test_success(struct kunit *test) + * { + * struct MOCK(example) *mock_example; + * struct example *example = mock_get_trgt(mock_example); + * struct mock_expectation *handle; + * + * mock_example = CONSTRUCT_MOCK(example, test); + * + * handle = KUNIT_EXPECT_CALL(foo(mock_get_ctrl(mock_example), + * kunit_int_eq(test, 5))); + * handle->action = int_return(test, 2); + * + * KUNIT_EXPECT_EQ(test, 2, example_bar(example, 5)); + * } + * + * Return: + * A &struct mock_expectation representing the call expectation. + * allowing additional conditions and actions to be specified. + */ +#define KUNIT_EXPECT_CALL(expectation_call) mock_master_##expectation_call + +#define mock_get_ctrl_internal(mock_object) (&(mock_object)->ctrl) +#define mock_get_ctrl(mock_object) mock_get_ctrl_internal(mock_object) + +#define mock_get_trgt_internal(mock_object) (&(mock_object)->trgt) +#define mock_get_trgt(mock_object) mock_get_trgt_internal(mock_object) + +#define mock_get_test(mock_object) (mock_get_ctrl(mock_object)->test) + +#define CLASS(struct_name) struct_name +#define HANDLE_INDEX(index) index +#define METHOD(method_name) method_name +#define RETURNS(return_type) return_type +/* #define PARAMS(...) __VA_ARGS__ included by linux/tracepoint.h */ + +#define MOCK_INIT_ID(struct_name) struct_name##mock_init +#define REAL_ID(func_name) __real__##func_name +#define INVOKE_ID(func_name) __invoke__##func_name + +#define DECLARE_MOCK_CLIENT(name, return_type, param_types...) \ + return_type name(PARAM_LIST_FROM_TYPES(param_types)) + +#define DECLARE_MOCK_MASTER(name, ctrl_index, param_types...) \ + struct mock_expectation *mock_master_##name( \ + MATCHER_PARAM_LIST_FROM_TYPES(ctrl_index, \ + param_types)) + +#define DECLARE_MOCK_COMMON(name, handle_index, return_type, param_types...) \ + DECLARE_MOCK_CLIENT(name, return_type, param_types); \ + DECLARE_MOCK_MASTER(name, handle_index, param_types) + +#define DECLARE_STRUCT_CLASS_MOCK_STRUCT(struct_name) \ + struct MOCK(struct_name) { \ + struct mock ctrl; \ + struct struct_name trgt; \ + } + +#define DECLARE_STRUCT_CLASS_MOCK_CONVERTER(struct_name) \ + static inline struct mock *from_##struct_name##_to_mock( \ + const struct struct_name *trgt) \ + { \ + return mock_get_ctrl( \ + container_of(trgt, \ + struct MOCK(struct_name), \ + trgt)); \ + } + +/** + * DECLARE_STRUCT_CLASS_MOCK_PREREQS() - Create a mock child class + * @struct_name: name of the class/struct to be mocked + * + * Creates a mock child class of ``struct_name`` named + * ``struct MOCK(struct_name)`` along with supporting internally used methods. + * + * See KUNIT_EXPECT_CALL() for example usages. + */ +#define DECLARE_STRUCT_CLASS_MOCK_PREREQS(struct_name) \ + DECLARE_STRUCT_CLASS_MOCK_STRUCT(struct_name); \ + DECLARE_STRUCT_CLASS_MOCK_CONVERTER(struct_name) + +#define DECLARE_STRUCT_CLASS_MOCK_HANDLE_INDEX_INTERNAL(name, \ + struct_name, \ + handle_index, \ + return_type, \ + param_types...) \ + DECLARE_MOCK_COMMON(name, \ + handle_index, \ + return_type, \ + param_types) + +#define DECLARE_STRUCT_CLASS_MOCK_HANDLE_INDEX(name, \ + struct_name, \ + handle_index, \ + return_type, \ + param_types...) \ + DECLARE_STRUCT_CLASS_MOCK_HANDLE_INDEX_INTERNAL(name, \ + struct_name, \ + handle_index, \ + return_type, \ + param_types) + +/** + * DECLARE_STRUCT_CLASS_MOCK() + * @name: method name + * @struct_name: name of the class/struct + * @return_type: return type of the method + * @param_types: parameters of the method + * + * Same as DEFINE_STRUCT_CLASS_MOCK(), but only makes header compatible + * declarations. + */ +#define DECLARE_STRUCT_CLASS_MOCK(name, \ + struct_name, \ + return_type, \ + param_types...) \ + DECLARE_STRUCT_CLASS_MOCK_HANDLE_INDEX(name, \ + struct_name, \ + 0, \ + return_type, \ + param_types) + +/** + * DECLARE_STRUCT_CLASS_MOCK_VOID_RETURN() + * @name: method name + * @struct_name: name of the class/struct + * @param_types: parameters of the method + * + * Same as DEFINE_STRUCT_CLASS_MOCK_VOID_RETURN(), but only makes header + * compatible declarations. + */ +#define DECLARE_STRUCT_CLASS_MOCK_VOID_RETURN(name, \ + struct_name, \ + param_types...) \ + DECLARE_STRUCT_CLASS_MOCK_HANDLE_INDEX(name, \ + struct_name, \ + 0, \ + void, \ + param_types) + +/** + * DECLARE_STRUCT_CLASS_MOCK_INIT() + * @struct_name: name of the class/struct + * + * Same as DEFINE_STRUCT_CLASS_MOCK_INIT(), but only makes header compatible + * declarations. + */ +#define DECLARE_STRUCT_CLASS_MOCK_INIT(struct_name) \ + struct MOCK(struct_name) *MOCK_INIT_ID(struct_name)( \ + struct kunit *test) + +/** + * CONSTRUCT_MOCK() + * @struct_name: name of the class + * @test: associated test + * + * Constructs and allocates a test managed ``struct MOCK(struct_name)`` given + * the name of the class for which the mock is defined and a test object. + * + * See KUNIT_EXPECT_CALL() for example usage. + */ +#define CONSTRUCT_MOCK(struct_name, test) MOCK_INIT_ID(struct_name)(test) + +#define DEFINE_MOCK_CLIENT_COMMON(name, \ + handle_index, \ + MOCK_SOURCE, \ + mock_source_ctx, \ + return_type, \ + RETURN, \ + param_types...) \ + return_type name(PARAM_LIST_FROM_TYPES(param_types)) \ + { \ + struct mock *mock = MOCK_SOURCE(mock_source_ctx, \ + handle_index); \ + static const char * const param_type_names[] = { \ + TYPE_NAMES_FROM_TYPES(handle_index, \ + param_types) \ + }; \ + const void *params[] = { \ + PTR_TO_ARG_FROM_TYPES(handle_index, \ + param_types) \ + }; \ + const void *retval; \ + \ + retval = mock->do_expect(mock, \ + #name, \ + name, \ + param_type_names, \ + params, \ + ARRAY_SIZE(params)); \ + KUNIT_ASSERT_NOT_ERR_OR_NULL(mock->test, retval); \ + if (!retval) { \ + kunit_info(mock->test, \ + "no action installed for "#name"\n");\ + BUG(); \ + } \ + RETURN(return_type, retval); \ + } + +#define CLASS_MOCK_CLIENT_SOURCE(ctx, handle_index) ctx(arg##handle_index) +#define DEFINE_MOCK_METHOD_CLIENT_COMMON(name, \ + handle_index, \ + mock_converter, \ + return_type, \ + RETURN, \ + param_types...) \ + DEFINE_MOCK_CLIENT_COMMON(name, \ + handle_index, \ + CLASS_MOCK_CLIENT_SOURCE, \ + mock_converter, \ + return_type, \ + RETURN, \ + param_types) + +#define CAST_AND_RETURN(return_type, retval) return *((return_type *) retval) +#define NO_RETURN(return_type, retval) + +#define DEFINE_MOCK_METHOD_CLIENT(name, \ + handle_index, \ + mock_converter, \ + return_type, \ + param_types...) \ + DEFINE_MOCK_METHOD_CLIENT_COMMON(name, \ + handle_index, \ + mock_converter, \ + return_type, \ + CAST_AND_RETURN, \ + param_types) + +#define DEFINE_MOCK_METHOD_CLIENT_VOID_RETURN(name, \ + handle_index, \ + mock_converter, \ + param_types...) \ + DEFINE_MOCK_METHOD_CLIENT_COMMON(name, \ + handle_index, \ + mock_converter, \ + void, \ + NO_RETURN, \ + param_types) + +#define DEFINE_MOCK_MASTER_COMMON_INTERNAL(name, \ + ctrl_index, \ + MOCK_SOURCE, \ + param_types...) \ + struct mock_expectation *mock_master_##name( \ + MATCHER_PARAM_LIST_FROM_TYPES(ctrl_index, \ + param_types)) \ + { \ + struct mock_param_matcher *matchers[] = { \ + ARG_NAMES_FROM_TYPES(ctrl_index, param_types) \ + }; \ + \ + return mock_add_matcher(MOCK_SOURCE(ctrl_index), \ + #name, \ + (const void *) name, \ + matchers, \ + ARRAY_SIZE(matchers)); \ + } +#define DEFINE_MOCK_MASTER_COMMON(name, \ + ctrl_index, \ + MOCK_SOURCE, \ + param_types...) \ + DEFINE_MOCK_MASTER_COMMON_INTERNAL(name, \ + ctrl_index, \ + MOCK_SOURCE, \ + param_types) + +#define CLASS_MOCK_MASTER_SOURCE(ctrl_index) arg##ctrl_index +#define DEFINE_MOCK_METHOD_MASTER(name, ctrl_index, param_types...) \ + DEFINE_MOCK_MASTER_COMMON(name, \ + ctrl_index, \ + CLASS_MOCK_MASTER_SOURCE, \ + param_types) + +#define DEFINE_MOCK_COMMON(name, \ + handle_index, \ + mock_converter, \ + return_type, \ + param_types...) \ + DEFINE_MOCK_METHOD_CLIENT(name, \ + handle_index, \ + mock_converter, \ + return_type, \ + param_types); \ + DEFINE_MOCK_METHOD_MASTER(name, handle_index, param_types) + +#define DEFINE_MOCK_COMMON_VOID_RETURN(name, \ + handle_index, \ + mock_converter, \ + param_types...) \ + DEFINE_MOCK_METHOD_CLIENT_VOID_RETURN(name, \ + handle_index, \ + mock_converter, \ + param_types); \ + DEFINE_MOCK_METHOD_MASTER(name, handle_index, param_types) + +#define DEFINE_STRUCT_CLASS_MOCK_HANDLE_INDEX_INTERNAL(name, \ + struct_name, \ + handle_index, \ + return_type, \ + param_types...) \ + DEFINE_MOCK_COMMON(name, \ + handle_index, \ + from_##struct_name##_to_mock, \ + return_type, param_types) +#define DEFINE_STRUCT_CLASS_MOCK_HANDLE_INDEX(name, \ + struct_name, \ + handle_index, \ + return_type, \ + param_types...) \ + DEFINE_STRUCT_CLASS_MOCK_HANDLE_INDEX_INTERNAL(name, \ + struct_name, \ + handle_index, \ + return_type, \ + param_types) + +#define DEFINE_STRUCT_CLASS_MOCK_HANDLE_INDEX_VOID_RETURN_INTERNAL( \ + name, \ + struct_name, \ + handle_index, \ + param_types...) \ + DEFINE_MOCK_COMMON_VOID_RETURN(name, \ + handle_index, \ + from_##struct_name##_to_mock, \ + param_types) +#define DEFINE_STRUCT_CLASS_MOCK_HANDLE_INDEX_VOID_RETURN(name, \ + struct_name, \ + handle_index, \ + param_types...) \ + DEFINE_STRUCT_CLASS_MOCK_HANDLE_INDEX_VOID_RETURN_INTERNAL( \ + name, \ + struct_name, \ + handle_index, \ + param_types) + +/** + * DEFINE_STRUCT_CLASS_MOCK() + * @name: name of the method + * @struct_name: name of the class of which the method belongs + * @return_type: return type of the method to be created. **Must not be void.** + * @param_types: parameters to method to be created. + * + * See KUNIT_EXPECT_CALL() for example usage. + */ +#define DEFINE_STRUCT_CLASS_MOCK(name, \ + struct_name, \ + return_type, \ + param_types...) \ + DEFINE_STRUCT_CLASS_MOCK_HANDLE_INDEX(name, \ + struct_name, \ + 0, \ + return_type, \ + param_types) + +/** + * DEFINE_STRUCT_CLASS_MOCK_VOID_RETURN() + * @name: name of the method + * @struct_name: name of the class of which the method belongs + * @param_types: parameters to method to be created. + * + * Same as DEFINE_STRUCT_CLASS_MOCK() except the method has a ``void`` return + * type. + */ +#define DEFINE_STRUCT_CLASS_MOCK_VOID_RETURN(name, struct_name, param_types...)\ + DEFINE_STRUCT_CLASS_MOCK_HANDLE_INDEX_VOID_RETURN(name, \ + struct_name, \ + 0, \ + param_types) + +/** + * DEFINE_STRUCT_CLASS_MOCK_INIT() + * @struct_name: name of the class + * @init_func: a function of type ``int (*)(struct MOCK(struct_name) *)``. This + * function is passed a pointer to an allocated, *but not + * initialized*, ``struct MOCK(struct_name)``. The job of this user + * provided function is to perform remaining initialization. Usually + * this entails assigning mock methods to the function pointers in + * the parent struct. + * + * See KUNIT_EXPECT_CALL() for example usage. + */ +#define DEFINE_STRUCT_CLASS_MOCK_INIT(struct_name, init_func) \ + struct MOCK(struct_name) *MOCK_INIT_ID(struct_name)( \ + struct kunit *test) \ + { \ + struct MOCK(struct_name) *mock_obj; \ + \ + mock_obj = kunit_kzalloc(test, \ + sizeof(*mock_obj), \ + GFP_KERNEL); \ + if (!mock_obj) \ + return NULL; \ + \ + mock_init_ctrl(test, mock_get_ctrl(mock_obj)); \ + \ + if (init_func(mock_obj)) \ + return NULL; \ + \ + return mock_obj; \ + } + #define CONVERT_TO_ACTUAL_TYPE(type, ptr) (*((type *) ptr))
/** diff --git a/lib/kunit/Makefile b/lib/kunit/Makefile index a7a3c5e0a8bf..649e1c1f0d00 100644 --- a/lib/kunit/Makefile +++ b/lib/kunit/Makefile @@ -13,11 +13,12 @@ kunit-objs += debugfs.o endif
obj-$(CONFIG_KUNIT_TEST) += kunit-test.o \ - mock-macro-test.o + mock-macro-test.o \ + mock-test.o
# string-stream-test compiles built-in only. ifeq ($(CONFIG_KUNIT_TEST),y) obj-$(CONFIG_KUNIT_TEST) += string-stream-test.o endif
-obj-$(CONFIG_KUNIT_EXAMPLE_TEST) += kunit-example-test.o +obj-$(CONFIG_KUNIT_EXAMPLE_TEST) += kunit-example-test.o diff --git a/lib/kunit/kunit-example-test.c b/lib/kunit/kunit-example-test.c index be1164ecc476..cd538cdb2a96 100644 --- a/lib/kunit/kunit-example-test.c +++ b/lib/kunit/kunit-example-test.c @@ -7,6 +7,7 @@ */
#include <kunit/test.h> +#include <kunit/mock.h>
/* * This is the most fundamental element of KUnit, the test case. A test case @@ -29,6 +30,84 @@ static void example_simple_test(struct kunit *test) KUNIT_EXPECT_EQ(test, 1 + 1, 2); }
+/* + * A lot of times, you have a C-style class like this, which acts an abstraction + * over hardware, a file system implementation, or some other subsystem that you + * want to reason about in a generic way. + */ +struct example { + int (*foo)(struct example *example, int num); +}; + +static int example_bar(struct example *example, int num) +{ + return example->foo(example, num); +} + +/* + * KUnit allows such a class to be "mocked out" with the following: + */ + +/* + * This macro creates a mock subclass of the specified class. + */ +DECLARE_STRUCT_CLASS_MOCK_PREREQS(example); + +/* + * This macro creates a mock implementation of the specified method of the + * specified class. + */ +DEFINE_STRUCT_CLASS_MOCK(METHOD(foo), CLASS(example), + RETURNS(int), + PARAMS(struct example *, int)); + +/* + * This tells KUnit how to initialize the parts of the mock that come from the + * parent. In this example, all we have to do is populate the member functions + * of the parent class with the mock versions we defined. + */ +static int example_init(struct MOCK(example) *mock_example) +{ + /* This is how you get a pointer to the parent class of a mock. */ + struct example *example = mock_get_trgt(mock_example); + + /* + * Here we populate the member function (method) with our mock method. + */ + example->foo = foo; + return 0; +} + +/* + * This registers our parent init function above, allowing KUnit to create a + * constructor for the mock. + */ +DEFINE_STRUCT_CLASS_MOCK_INIT(example, example_init); + +/* + * This is a test case where we use our mock. + */ +static void example_mock_test(struct kunit *test) +{ + struct MOCK(example) *mock_example = test->priv; + struct example *example = mock_get_trgt(mock_example); + struct mock_expectation *handle; + + /* + * Here we make an expectation that our mock method will be called with + * a parameter equal to 5 passed in. + */ + handle = KUNIT_EXPECT_CALL(foo(mock_get_ctrl(mock_example), + kunit_int_eq(test, 5))); + /* + * We specify that when our mock is called in this way, we want it to + * return 2. + */ + handle->action = kunit_int_return(test, 2); + + KUNIT_EXPECT_EQ(test, 2, example_bar(example, 5)); +} + /* * This is run once before each test case, see the comment on * example_test_suite for more information. @@ -37,6 +116,16 @@ static int example_test_init(struct kunit *test) { kunit_info(test, "initializing\n");
+ /* + * Here we construct the mock and store it in test's `priv` field; this + * field is for KUnit users. You can put whatever you want here, but + * most often it is a place that the init function can put stuff to be + * used by test cases. + */ + test->priv = CONSTRUCT_MOCK(example, test); + if (!test->priv) + return -EINVAL; + return 0; }
@@ -52,6 +141,7 @@ static struct kunit_case example_test_cases[] = { * test suite. */ KUNIT_CASE(example_simple_test), + KUNIT_CASE(example_mock_test), {} };
diff --git a/lib/kunit/mock-macro-test.c b/lib/kunit/mock-macro-test.c index 6c3dc2193edb..d196dbee2407 100644 --- a/lib/kunit/mock-macro-test.c +++ b/lib/kunit/mock-macro-test.c @@ -8,6 +8,55 @@
#include <kunit/test.h> #include <kunit/params.h> +#include <kunit/mock.h> + +struct mock_macro_dummy_struct { + int (*one_param)(struct mock_macro_dummy_struct *test_struct); + int (*two_param)(struct mock_macro_dummy_struct *test_struct, int num); + int (*non_first_slot_param)( + int num, + struct mock_macro_dummy_struct *test_struct); + void *(*void_ptr_return)(struct mock_macro_dummy_struct *test_struct); +}; + +DECLARE_STRUCT_CLASS_MOCK_PREREQS(mock_macro_dummy_struct); + +DEFINE_STRUCT_CLASS_MOCK(METHOD(one_param), CLASS(mock_macro_dummy_struct), + RETURNS(int), + PARAMS(struct mock_macro_dummy_struct *)); + +DEFINE_STRUCT_CLASS_MOCK(METHOD(two_param), CLASS(mock_macro_dummy_struct), + RETURNS(int), + PARAMS(struct mock_macro_dummy_struct *, int)); + +DEFINE_STRUCT_CLASS_MOCK_HANDLE_INDEX(METHOD(non_first_slot_param), + CLASS(mock_macro_dummy_struct), HANDLE_INDEX(1), + RETURNS(int), + PARAMS(int, struct mock_macro_dummy_struct *)); + +DEFINE_STRUCT_CLASS_MOCK(METHOD(void_ptr_return), + CLASS(mock_macro_dummy_struct), + RETURNS(void *), + PARAMS(struct mock_macro_dummy_struct *)); + +static int mock_macro_dummy_struct_init( + struct MOCK(mock_macro_dummy_struct) *mock_test_struct) +{ + struct mock_macro_dummy_struct *test_struct = + mock_get_trgt(mock_test_struct); + + test_struct->one_param = one_param; + test_struct->two_param = two_param; + test_struct->non_first_slot_param = non_first_slot_param; + return 0; +} + +DEFINE_STRUCT_CLASS_MOCK_INIT(mock_macro_dummy_struct, + mock_macro_dummy_struct_init); + +struct mock_macro_context { + struct MOCK(mock_macro_dummy_struct) *mock_test_struct; +};
#define TO_STR_INTERNAL(...) #__VA_ARGS__ #define TO_STR(...) TO_STR_INTERNAL(__VA_ARGS__) @@ -132,6 +181,46 @@ static void mock_macro_arg_names_from_types(struct kunit *test) type15))); }
+static void mock_macro_test_generated_method_code_works(struct kunit *test) +{ + struct mock_macro_context *ctx = test->priv; + struct MOCK(mock_macro_dummy_struct) *mock_test_struct = + ctx->mock_test_struct; + struct mock_macro_dummy_struct *test_struct = + mock_get_trgt(mock_test_struct); + struct mock_expectation *handle; + + handle = KUNIT_EXPECT_CALL(one_param(mock_get_ctrl(mock_test_struct))); + handle->action = kunit_int_return(test, 0); + handle = KUNIT_EXPECT_CALL(two_param(mock_get_ctrl(mock_test_struct), + kunit_int_eq(test, 5))); + handle->action = kunit_int_return(test, 1); + handle = KUNIT_EXPECT_CALL(non_first_slot_param( + kunit_int_eq(test, 5), + mock_get_ctrl(mock_test_struct))); + handle->action = kunit_int_return(test, 1); + + test_struct->one_param(test_struct); + test_struct->two_param(test_struct, 5); + test_struct->non_first_slot_param(5, test_struct); +} + +static int mock_macro_test_init(struct kunit *test) +{ + struct mock_macro_context *ctx; + + ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL); + if (!ctx) + return -ENOMEM; + test->priv = ctx; + + ctx->mock_test_struct = CONSTRUCT_MOCK(mock_macro_dummy_struct, test); + if (!ctx->mock_test_struct) + return -EINVAL; + + return 0; +} + static struct kunit_case mock_macro_test_cases[] = { KUNIT_CASE(mock_macro_is_equal), KUNIT_CASE(mock_macro_if), @@ -140,11 +229,13 @@ static struct kunit_case mock_macro_test_cases[] = { KUNIT_CASE(mock_macro_for_each_param), KUNIT_CASE(mock_macro_param_list_from_types_basic), KUNIT_CASE(mock_macro_arg_names_from_types), + KUNIT_CASE(mock_macro_test_generated_method_code_works), {} };
static struct kunit_suite mock_macro_test_suite = { .name = "mock-macro-test", + .init = mock_macro_test_init, .test_cases = mock_macro_test_cases, }; kunit_test_suite(mock_macro_test_suite); diff --git a/lib/kunit/mock-test.c b/lib/kunit/mock-test.c new file mode 100644 index 000000000000..8a0fa33d087c --- /dev/null +++ b/lib/kunit/mock-test.c @@ -0,0 +1,320 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * KUnit test for mock.h. + * + * Copyright (C) 2020, Google LLC. + * Author: Brendan Higgins brendanhiggins@google.com + */ + +#include <kunit/test.h> +#include <kunit/mock.h> + +// A simple class for unit-testing/example purposes. +struct adder { + int (*add)(struct adder *adder, int x, int y); +}; + +static int real_add(struct adder *adder, int x, int y) +{ + return x + y; +} + +static void adder_real_init(struct adder *adder) +{ + adder->add = real_add; +} + +DECLARE_STRUCT_CLASS_MOCK_PREREQS(adder); +DEFINE_STRUCT_CLASS_MOCK(METHOD(mock_add), CLASS(adder), RETURNS(int), + PARAMS(struct adder*, int, int)); +DECLARE_STRUCT_CLASS_MOCK_INIT(adder); + +// This would normally live in the .c file. +static int adder_mock_init(struct MOCK(adder) *mock_adder) +{ + struct adder *real = mock_get_trgt(mock_adder); + + adder_real_init(real); + + real->add = mock_add; + mock_set_default_action(mock_get_ctrl(mock_adder), + "mock_add", + mock_add, + kunit_int_return(mock_get_test(mock_adder), 0)); + return 0; +} +DEFINE_STRUCT_CLASS_MOCK_INIT(adder, adder_mock_init); + + +/* + * Note: we create a new `failing_test` so we can validate that failed mock + * expectations mark tests as failed. + * Marking the real `test` as failed is obviously problematic. + * + * See mock_test_failed_expect_call_fails_test for an example. + */ +struct mock_test_context { + struct kunit *failing_test; + struct mock *mock; +}; + +static void mock_test_do_expect_basic(struct kunit *test) +{ + struct mock_test_context *ctx = test->priv; + struct mock *mock = ctx->mock; + int param0 = 5, param1 = -4; + static const char * const two_param_types[] = {"int", "int"}; + const void *two_params[] = {¶m0, ¶m1}; + struct mock_param_matcher *matchers_any_two[] = { + kunit_any(test), kunit_any(test) + }; + struct mock_expectation *expectation; + const void *ret; + + expectation = mock_add_matcher(mock, + "", + NULL, + matchers_any_two, + ARRAY_SIZE(matchers_any_two)); + expectation->action = kunit_int_return(test, 5); + KUNIT_EXPECT_EQ(test, 0, expectation->times_called); + + ret = mock->do_expect(mock, + "", + NULL, + two_param_types, + two_params, + ARRAY_SIZE(two_params)); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ret); + KUNIT_EXPECT_EQ(test, 5, *((int *) ret)); + KUNIT_EXPECT_EQ(test, 1, expectation->times_called); +} + +static void mock_test_ptr_eq(struct kunit *test) +{ + struct mock_test_context *ctx = test->priv; + struct kunit *failing_test = ctx->failing_test; + struct mock *mock = ctx->mock; + void *param0 = ctx, *param1 = failing_test; + static const char * const two_param_types[] = {"void *", "void *"}; + const void *two_params[] = {¶m0, ¶m1}; + struct mock_param_matcher *matchers_two_ptrs[] = { + kunit_ptr_eq(test, param0), kunit_ptr_eq(test, param1) + }; + struct mock_expectation *expectation; + const void *ret; + + expectation = mock_add_matcher(mock, + "", + NULL, + matchers_two_ptrs, + ARRAY_SIZE(matchers_two_ptrs)); + expectation->action = kunit_int_return(test, 0); + KUNIT_EXPECT_EQ(test, 0, expectation->times_called); + + ret = mock->do_expect(mock, + "", + NULL, + two_param_types, + two_params, + ARRAY_SIZE(two_params)); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ret); + KUNIT_EXPECT_EQ(test, 1, expectation->times_called); +} + +static void mock_test_ptr_eq_not_equal(struct kunit *test) +{ + struct mock_test_context *ctx = test->priv; + struct kunit *failing_test = ctx->failing_test; + struct mock *mock = ctx->mock; + + /* Pick some two pointers, but pass in different values. */ + void *param0 = test, *param1 = failing_test; + static const char * const two_param_types[] = {"void *", "void *"}; + const void *two_params[] = {¶m0, ¶m1}; + struct mock_param_matcher *matchers_two_ptrs[] = { + kunit_ptr_eq(failing_test, param0), + kunit_ptr_eq(failing_test, param1 - 1) + }; + struct mock_expectation *expectation; + const void *ret; + + expectation = mock_add_matcher(mock, + "", + NULL, + matchers_two_ptrs, + ARRAY_SIZE(matchers_two_ptrs)); + expectation->action = kunit_int_return(failing_test, 0); + KUNIT_EXPECT_EQ(test, 0, expectation->times_called); + + ret = mock->do_expect(mock, + "", + NULL, + two_param_types, + two_params, + ARRAY_SIZE(two_params)); + KUNIT_EXPECT_FALSE(test, ret); + KUNIT_EXPECT_EQ(test, 0, expectation->times_called); + + KUNIT_EXPECT_FALSE(test, failing_test->success); +} + +/* + * In order for us to be able to rely on KUNIT_EXPECT_CALL to validate other + * behavior, we need to test that unsatisfied KUNIT_EXPECT_CALL causes a test + * failure. + * + * In order to understand what this test is testing we must first understand how + * KUNIT_EXPECT_CALL() works conceptually. In theory, a test specifies that it + * expects some function to be called some number of times (can be zero), with + * some particular arguments. Hence, KUNIT_EXPECT_CALL() must do two things: + * + * 1) Determine whether a function call matches the expectation. + * + * 2) Fail if there are too many or too few matches. + */ +static void mock_test_failed_expect_call_fails_test(struct kunit *test) +{ + /* + * We do not want to fail the real `test` object used to run this test. + * So we use a separate `failing_test` for KUNIT_EXPECT_CALL(). + */ + struct mock_test_context *ctx = test->priv; + struct kunit *failing_test = ctx->failing_test; + struct mock *mock = ctx->mock; + + /* + * Put an expectation on mock, which we won't satisify. + * + * NOTE: it does not actually matter what function we expect here. + * `mock` does not represent an actual mock on anything; we just need to + * create some expectation, that we won't satisfy. + */ + KUNIT_EXPECT_CALL(mock_add(mock, + kunit_any(failing_test), + kunit_any(failing_test))); + + /* + * Validate the unsatisfied expectation that we just created. This + * should cause `failing_test` to fail. + */ + mock_validate_expectations(mock); + + /* Verify that `failing_test` has actually failed. */ + KUNIT_EXPECT_FALSE(test, failing_test->success); +} + +static void mock_test_do_expect_default_return(struct kunit *test) +{ + struct mock_test_context *ctx = test->priv; + struct mock *mock = ctx->mock; + int param0 = 5, param1 = -5; + static const char * const two_param_types[] = {"int", "int"}; + const void *two_params[] = {¶m0, ¶m1}; + struct mock_param_matcher *matchers[] = { + kunit_int_eq(test, 5), + kunit_int_eq(test, -4) + }; + struct mock_expectation *expectation; + const void *ret; + + expectation = mock_add_matcher(mock, + "add", + mock_add, + matchers, + ARRAY_SIZE(matchers)); + expectation->action = kunit_int_return(test, 5); + KUNIT_EXPECT_EQ(test, 0, expectation->times_called); + + KUNIT_EXPECT_FALSE(test, + mock_set_default_action(mock, + "add", + mock_add, + kunit_int_return(test, -4))); + + ret = mock->do_expect(mock, + "add", + mock_add, + two_param_types, + two_params, + ARRAY_SIZE(two_params)); + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ret); + KUNIT_EXPECT_EQ(test, -4, *((int *) ret)); + KUNIT_EXPECT_EQ(test, 0, expectation->times_called); +} + +static void mock_test_mock_validate_expectations(struct kunit *test) +{ + struct mock_test_context *ctx = test->priv; + struct kunit *failing_test = ctx->failing_test; + struct mock *mock = ctx->mock; + + struct mock_param_matcher *matchers[] = { + kunit_int_eq(failing_test, 5), + kunit_int_eq(failing_test, -4) + }; + struct mock_expectation *expectation; + + + expectation = mock_add_matcher(mock, + "add", + mock_add, + matchers, + ARRAY_SIZE(matchers)); + expectation->times_called = 0; + expectation->min_calls_expected = 1; + expectation->max_calls_expected = 1; + + mock_validate_expectations(mock); + + KUNIT_EXPECT_FALSE(test, failing_test->success); +} + +static int mock_test_init(struct kunit *test) +{ + struct mock_test_context *ctx; + + ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL); + if (!ctx) + return -ENOMEM; + test->priv = ctx; + + ctx->failing_test = kunit_kzalloc(test, sizeof(*ctx->failing_test), + GFP_KERNEL); + if (!ctx->failing_test) + return -EINVAL; + kunit_init_test(ctx->failing_test, NULL, NULL); + + ctx->mock = kunit_kzalloc(test, sizeof(*ctx->mock), GFP_KERNEL); + if (!ctx->mock) + return -ENOMEM; + mock_init_ctrl(ctx->failing_test, ctx->mock); + + return 0; +} + +static void mock_test_exit(struct kunit *test) +{ + struct mock_test_context *ctx = test->priv; + + kunit_cleanup(ctx->failing_test); +} + +static struct kunit_case mock_test_cases[] = { + KUNIT_CASE(mock_test_do_expect_basic), + KUNIT_CASE(mock_test_ptr_eq), + KUNIT_CASE(mock_test_ptr_eq_not_equal), + KUNIT_CASE(mock_test_failed_expect_call_fails_test), + KUNIT_CASE(mock_test_do_expect_default_return), + KUNIT_CASE(mock_test_mock_validate_expectations), + {} +}; + +static struct kunit_suite mock_test_suite = { + .name = "mock-test", + .init = mock_test_init, + .exit = mock_test_exit, + .test_cases = mock_test_cases, +}; + +kunit_test_suite(mock_test_suite);