On 3/29/23 13:34, Rae Moar wrote:
On Sun, Mar 26, 2023 at 10:41 PM Frank Rowand frowand.list@gmail.com wrote:
On 3/16/23 17:59, Rae Moar wrote:
Add recognition of the test name line ("# Subtest: <name>") to the KTAP v2 spec.
The purpose of this line is to declare the name of a test before its results. This functionality is especially useful when trying to parse test results incrementally and when interpretting results after a crash.
This line is already compliant with KTAP v1 as it is interpretted as a diagnostic line by parsers. Additionally, the line is currently used by KUnit tests and was derived from the TAP 14 spec: https://testanything.org/tap-version-14-specification.html.
It is convenient that "# Subtest: <name>" is compatible with v1, but I think that there is a negative that overrides the convenience.
The "# Subtest: <name>" syntax means that we need to restrict the format of diagnostic lines, such that "#Subtest:" is an illegal diagnostic, at least for the line immediately following the Version line.
Hi Frank,
Yes, I see what you are saying here. It would be inconvenient for parsers to make an exception to the method of parsing diagnostic lines.
I think it would be cleaner to modify the Version line syntax to be:
KTAP version 2 [# <subtest_name>]
I like that this idea wouldn't introduce a new line, which is invaluable. However, I would suspect this alternative may break more parsers than the first proposal, as current parsers may search for the full version line to find KTAP results (I know at least KUnit does this). Therefore I slightly prefer the original proposal. Curious what others prefer?
If the parser searches the full version line, it will already fail to accept "KTAP version 2", because it is looking for "KTAP version 1" only. When the parser gets updated to find "KTAP version 2", it should be not too difficult to add "[# <subtest_name>]" to be valid data.
-Frank
Overall, I advocate that KTAP should allow a way to define the name of the test prior to the results based on the reasons discussed above and by Daniel and Frank. So if this is the preferred method I would understand.
I notice that the KTAP Specification version 1 fails to specify the Version line syntax. So the Specification would be updated from:
All KTAP-formatted results begin with a "version line" which specifies which version of the (K)TAP standard the result is compliant with.
For example:
- "KTAP version 1"
- "TAP version 13"
- "TAP version 14"
to:
The Version line is required and must have the format:
.. code-block:: none
KTAP version 2 [# <subtest_name>]I like this added specificity. Would be happy to see specific version line syntax added to the spec.
Thanks!
Rae
All KTAP-formatted results begin with a "version line" which specifies which version of the (K)TAP standard the result is compliant with.
For example:
- "KTAP version 2"
- "TAP version 13"
- "TAP version 14"
Recognition of this line would create an accepted way for different test frameworks to declare the name of a test before its results.
The proposed location for this line is between the version line and the test plan line. This location ensures that the line would not be accidentally parsed as a subtest's diagnostic lines. Note this proposed location would be a slight differentiation from KTAP v1.
Example of test name line:
KTAP version 2 # Subtest: main_test 1..1 KTAP version 2 # Subtest: sub_test 1..2 ok 1 test_1 ok 2 test_2 ok 1 sub_test
Here is a link to a version of the KUnit parser that is able to parse the test name line for KTAP version 2. Note this includes a test name line for the main level of KTAP.
Link: https://kunit-review.googlesource.com/c/linux/+/5709
Signed-off-by: Rae Moar rmoar@google.com
This is a RFC. I would like to know what people think and use this as a platform for discussion on KTAP v2.
Note: this patch is based on Frank's ktap_spec_version_2 branch.
Documentation/dev-tools/ktap.rst | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-)
diff --git a/Documentation/dev-tools/ktap.rst b/Documentation/dev-tools/ktap.rst index ff77f4aaa6ef..9c7ed66d9f77 100644 --- a/Documentation/dev-tools/ktap.rst +++ b/Documentation/dev-tools/ktap.rst @@ -28,8 +28,7 @@ KTAP output is built from four different types of lines: In general, valid KTAP output should also form valid TAP output, but some information, in particular nested test results, may be lost. Also note that there is a stagnant draft specification for TAP14, KTAP diverges from this in -a couple of places (notably the "Subtest" header), which are described where -relevant later in this document. +a couple of places, which are described where relevant later in this document.
Version lines
@@ -44,8 +43,8 @@ For example:
- "TAP version 14"
Note that, in KTAP, subtests also begin with a version line, which denotes the
-start of the nested test results. This differs from TAP14, which uses a -separate "Subtest" line.
^^^^ This is an error in the KTAP Specification version 1. TAP14 allows the case of "Bare Subtests", which would be the equivalent of the KTAP v1 method.
+start of the nested test results. This differs from TAP14, which uses only a +"Subtest" line.
While, going forward, "KTAP version 2" should be used by compliant tests, it is expected that most parsers and other tooling will accept the other versions @@ -166,6 +165,12 @@ even if they do not start with a "#": this is to capture any other useful kernel output which may help debug the test. It is nevertheless recommended that tests always prefix any diagnostic output they have with a "#" character.
+One recognized diagnostic line is the "# Subtest: <name>" line. This line +is used to declare the name of a test before subtest results are printed. This +is helpful for parsing and for providing context during crashes. As a rule, +this line is placed after the version line and before the plan line. Note +this line can be used for the main test, as well as subtests.
Unknown lines
@@ -206,6 +211,7 @@ An example of a test with two nested subtests: KTAP version 2 1..1 KTAP version 2
# Subtest: example 1..2 ok 1 test_1 not ok 2 test_2@@ -219,6 +225,7 @@ An example format with multiple levels of nested testing: KTAP version 2 1..2 KTAP version 2
# Subtest: example_test_1 1..2 KTAP version 2 1..2@@ -245,7 +252,7 @@ allows an arbitrary number of tests to be nested no yes
The TAP14 specification does permit nested tests, but instead of using another nested version line, uses a line of the form -"Subtest: <name>" where <name> is the name of the parent test. +"Subtest: <name>" where <name> is the name of the parent test as discussed above.
Example KTAP output
@@ -254,6 +261,7 @@ Example KTAP output KTAP version 2 1..1 KTAP version 2
# Subtest: main_test 1..3 KTAP version 2 1..1@@ -266,6 +274,7 @@ Example KTAP output ok 2 test_2 ok 2 example_test_2 KTAP version 2
# Subtest: example_test_3 1..3 ok 1 test_1 # test_2: FAILbase-commit: 906f02e42adfbd5ae70d328ee71656ecb602aaf5
-- You received this message because you are subscribed to the Google Groups "KUnit Development" group. To unsubscribe from this group and stop receiving emails from it, send an email to kunit-dev+unsubscribe@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/kunit-dev/197889b6-5773-094c-8699-26843c65....