Add a test for string stream along with a simpler example.
Signed-off-by: Brendan Higgins brendanhiggins@google.com --- kunit/Kconfig | 12 ++++++ kunit/Makefile | 4 +- kunit/example-test.c | 88 ++++++++++++++++++++++++++++++++++++++ kunit/string-stream-test.c | 61 ++++++++++++++++++++++++++ 4 files changed, 164 insertions(+), 1 deletion(-) create mode 100644 kunit/example-test.c create mode 100644 kunit/string-stream-test.c
diff --git a/kunit/Kconfig b/kunit/Kconfig index 49b44c4f6630a..c3dc7bca83f9d 100644 --- a/kunit/Kconfig +++ b/kunit/Kconfig @@ -14,4 +14,16 @@ config KUNIT special hardware. For more information, please see Documentation/kunit/
+config KUNIT_TEST + bool "KUnit test for KUnit" + depends on KUNIT + help + Enables KUnit test to test KUnit. + +config KUNIT_EXAMPLE_TEST + bool "Example test for KUnit" + depends on KUNIT + help + Enables example KUnit test to demo features of KUnit. + endmenu diff --git a/kunit/Makefile b/kunit/Makefile index 5b4562ea7f322..b437bd546ab70 100644 --- a/kunit/Makefile +++ b/kunit/Makefile @@ -1 +1,3 @@ -obj-$(CONFIG_KUNIT) += test.o string-stream.o test-stream.o +obj-$(CONFIG_KUNIT) += test.o string-stream.o test-stream.o +obj-$(CONFIG_KUNIT_TEST) += string-stream-test.o +obj-$(CONFIG_KUNIT_EXAMPLE_TEST) += example-test.o diff --git a/kunit/example-test.c b/kunit/example-test.c new file mode 100644 index 0000000000000..e9bd2b41c5fd2 --- /dev/null +++ b/kunit/example-test.c @@ -0,0 +1,88 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Example KUnit test to show how to use KUnit. + * + * Copyright (C) 2018, Google LLC. + * Author: Brendan Higgins brendanhiggins@google.com + */ + +#include <kunit/test.h> + +/* + * This is the most fundamental element of KUnit, the test case. A test case + * makes a set EXPECTATIONs and ASSERTIONs about the behavior of some code; if + * any expectations or assertions are not met, the test fails; otherwise, the + * test passes. + * + * In KUnit, a test case is just a function with the signature + * `void (*)(struct test *)`. `struct test` is a context object that stores + * information about the current test. + */ +static void example_simple_test(struct test *test) +{ + /* + * This is an EXPECTATION; it is how KUnit tests things. When you want + * to test a piece of code, you set some expectations about what the + * code should do. KUnit then runs the test and verifies that the code's + * behavior matched what was expected. + */ + TEST_EXPECT_EQ(test, 1 + 1, 2); +} + +/* + * This is run once before each test case, see the comment on + * example_test_module for more information. + */ +static int example_test_init(struct test *test) +{ + test_info(test, "initializing"); + + return 0; +} + +/* + * Here we make a list of all the test cases we want to add to the test module + * below. + */ +static struct test_case example_test_cases[] = { + /* + * This is a helper to create a test case object from a test case + * function; its exact function is not important to understand how to + * use KUnit, just know that this is how you associate test cases with a + * test module. + */ + TEST_CASE(example_simple_test), + {}, +}; + +/* + * This defines a suite or grouping of tests. + * + * Test cases are defined as belonging to the suite by adding them to + * `test_cases`. + * + * Often it is desirable to run some function which will set up things which + * will be used by every test; this is accomplished with an `init` function + * which runs before each test case is invoked. Similarly, an `exit` function + * may be specified which runs after every test case and can be used to for + * cleanup. For clarity, running tests in a test module would behave as follows: + * + * module.init(test); + * module.test_case[0](test); + * module.exit(test); + * module.init(test); + * module.test_case[1](test); + * module.exit(test); + * ...; + */ +static struct test_module example_test_module = { + .name = "example", + .init = example_test_init, + .test_cases = example_test_cases, +}; + +/* + * This registers the above test module telling KUnit that this is a suite of + * tests that need to be run. + */ +module_test(example_test_module); diff --git a/kunit/string-stream-test.c b/kunit/string-stream-test.c new file mode 100644 index 0000000000000..07c626cbfffbf --- /dev/null +++ b/kunit/string-stream-test.c @@ -0,0 +1,61 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * KUnit test for struct string_stream. + * + * Copyright (C) 2018, Google LLC. + * Author: Brendan Higgins brendanhiggins@google.com + */ + +#include <linux/slab.h> +#include <kunit/test.h> +#include <kunit/string-stream.h> + +static void string_stream_test_get_string(struct test *test) +{ + struct string_stream *stream = new_string_stream(); + char *output; + + stream->add(stream, "Foo"); + stream->add(stream, " %s", "bar"); + + output = stream->get_string(stream); + TEST_EXPECT_STREQ(test, output, "Foo bar"); + kfree(output); + destroy_string_stream(stream); +} + +static void string_stream_test_add_and_clear(struct test *test) +{ + struct string_stream *stream = new_string_stream(); + char *output; + int i; + + for (i = 0; i < 10; i++) + stream->add(stream, "A"); + + output = stream->get_string(stream); + TEST_EXPECT_STREQ(test, output, "AAAAAAAAAA"); + TEST_EXPECT_EQ(test, stream->length, 10); + TEST_EXPECT_FALSE(test, stream->is_empty(stream)); + kfree(output); + + stream->clear(stream); + + output = stream->get_string(stream); + TEST_EXPECT_STREQ(test, output, ""); + TEST_EXPECT_TRUE(test, stream->is_empty(stream)); + destroy_string_stream(stream); +} + +static struct test_case string_stream_test_cases[] = { + TEST_CASE(string_stream_test_get_string), + TEST_CASE(string_stream_test_add_and_clear), + {} +}; + +static struct test_module string_stream_test_module = { + .name = "string-stream-test", + .test_cases = string_stream_test_cases +}; +module_test(string_stream_test_module); +