[Linux-kernel-mentees] [PATCH v3] lib: Convert test_printf.c to KUnit

Greg KH gregkh at linuxfoundation.org
Tue Nov 3 11:52:23 UTC 2020


On Tue, Nov 03, 2020 at 01:33:53PM +0200, Andy Shevchenko wrote:
> On Tue, Nov 03, 2020 at 04:40:49PM +0530, Arpitha Raghunandan wrote:
> > Convert test lib/test_printf.c to KUnit. More information about
> > KUnit can be found at:
> > https://www.kernel.org/doc/html/latest/dev-tools/kunit/index.html.
> > KUnit provides a common framework for unit tests in the kernel.
> > KUnit and kselftest are standardizing around KTAP, converting this
> > test to KUnit makes this test output in KTAP which we are trying to
> > make the standard test result format for the kernel. More about
> > the KTAP format can be found at:
> > https://lore.kernel.org/linux-kselftest/CY4PR13MB1175B804E31E502221BC8163FD830@CY4PR13MB1175.namprd13.prod.outlook.com/.
> > I ran both the original and converted tests as is to produce the
> > output for success of the test in the two cases. I also ran these
> > tests with a small modification to show the difference in the output
> > for failure of the test in both cases. The modification I made is:
> > - test("127.000.000.001|127.0.0.1", "%pi4|%pI4", &sa.sin_addr, &sa.sin_addr);
> > + test("127-000.000.001|127.0.0.1", "%pi4|%pI4", &sa.sin_addr, &sa.sin_addr);
> > 
> > Original test success:
> > [    0.540860] test_printf: loaded.
> > [    0.540863] test_printf: random seed = 0x5c46c33837bc0619
> > [    0.541022] test_printf: all 388 tests passed
> > 
> > Original test failure:
> > [    0.537980] test_printf: loaded.
> > [    0.537983] test_printf: random seed = 0x1bc1efd881954afb
> > [    0.538029] test_printf: vsnprintf(buf, 256, "%pi4|%pI4", ...) wrote '127.000.000.001|127.0.0.1', expected '127-000.000.001|127.0.0.1'
> > [    0.538030] test_printf: kvasprintf(..., "%pi4|%pI4", ...) returned '127.000.000.001|127.0.0.1', expected '127-000.000.001|127.0.0.1'
> > [    0.538124] test_printf: failed 2 out of 388 tests
> > [    0.538125] test_printf: random seed used was 0x1bc1efd881954afb
> > 
> > Converted test success:
> >     # Subtest: printf
> >     1..25
> >     ok 1 - test_basic
> >     ok 2 - test_number
> >     ok 3 - test_string
> >     ok 4 - plain
> >     ok 5 - null_pointer
> >     ok 6 - error_pointer
> >     ok 7 - invalid_pointer
> >     ok 8 - symbol_ptr
> >     ok 9 - kernel_ptr
> >     ok 10 - struct_resource
> >     ok 11 - addr
> >     ok 12 - escaped_str
> >     ok 13 - hex_string
> >     ok 14 - mac
> >     ok 15 - ip
> >     ok 16 - uuid
> >     ok 17 - dentry
> >     ok 18 - struct_va_format
> >     ok 19 - time_and_date
> >     ok 20 - struct_clk
> >     ok 21 - bitmap
> >     ok 22 - netdev_features
> >     ok 23 - flags
> >     ok 24 - errptr
> >     ok 25 - fwnode_pointer
> > ok 1 - printf
> > 
> > Converted test failure:
> >     # Subtest: printf
> >     1..25
> >     ok 1 - test_basic
> >     ok 2 - test_number
> >     ok 3 - test_string
> >     ok 4 - plain
> >     ok 5 - null_pointer
> >     ok 6 - error_pointer
> >     ok 7 - invalid_pointer
> >     ok 8 - symbol_ptr
> >     ok 9 - kernel_ptr
> >     ok 10 - struct_resource
> >     ok 11 - addr
> >     ok 12 - escaped_str
> >     ok 13 - hex_string
> >     ok 14 - mac
> >     # ip: EXPECTATION FAILED at lib/printf_kunit.c:82
> > vsnprintf(buf, 256, "%pi4|%pI4", ...) wrote '127.000.000.001|127.0.0.1', expected '127-000.000.001|127.0.0.1'
> >     # ip: EXPECTATION FAILED at lib/printf_kunit.c:124
> > kvasprintf(..., "%pi4|%pI4", ...) returned '127.000.000.001|127.0.0.1', expected '127-000.000.001|127.0.0.1'
> >     not ok 15 - ip
> >     ok 16 - uuid
> >     ok 17 - dentry
> >     ok 18 - struct_va_format
> >     ok 19 - time_and_date
> >     ok 20 - struct_clk
> >     ok 21 - bitmap
> >     ok 22 - netdev_features
> >     ok 23 - flags
> >     ok 24 - errptr
> >     ok 25 - fwnode_pointer
> > not ok 1 - printf
> 
> Better, indeed.
> 
> But can be this improved to have a cumulative statistics, like showing only
> number of total, succeeded, failed with details of the latter ones?

Is that the proper test output format?  We have a standard...

thanks,

greg k-h


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