% Testing the JDK
This new way of running tests is developer-centric. It assumes that you have built a JDK locally and want to test it. Running common test targets is simple, and more complex ad-hoc combination of tests is possible. The user interface is forgiving, and clearly report errors it cannot resolve.
The main target "run-test" uses the jdk-image as the tested product. There is also an alternate target "exploded-run-test" that uses the exploded image instead. Not all tests will run successfully on the exploded image, but using this target can greatly improve rebuild times for certain workflows.
Some example command-lines:
$ make run-test-tier1
$ make run-test-jdk_lang JTREG="JOBS=8"
$ make run-test TEST=jdk_lang
$ make run-test-only TEST="gtest:LogTagSet gtest:LogTagSetDescriptions" GTEST="REPEAT=-1"
$ make run-test TEST="hotspot:hotspot_gc" JTREG="JOBS=1;TIMEOUT=8;VM_OPTIONS=-XshowSettings -Xlog:gc+ref=debug"
$ make run-test TEST="jtreg:test/hotspot:hotspot_gc test/hotspot/jtreg/native_sanity/JniVersion.java"
$ make exploded-run-test TEST=tier2
To be able to run JTReg tests, configure needs to know where to find the
JTReg test framework. If it is not picked up automatically by configure, use
the --with-jtreg=<path to jtreg home> option to point to the JTReg framework.
Note that this option should point to the JTReg home, i.e. the top directory,
containing lib/jtreg.jar etc. (An alternative is to set the JT_HOME
environment variable to point to the JTReg home before running configure.)
All functionality is available using the run-test make target. In this use
case, the test or tests to be executed is controlled using the TEST variable.
To speed up subsequent test runs with no source code changes, run-test-only can
be used instead, which do not depend on the source and test image build.
For some common top-level tests, direct make targets have been generated. This
includes all JTReg test groups, the hotspot gtest, and custom tests (if
present). This means that make run-test-tier1 is equivalent to make run-test TEST="tier1", but the latter is more tab-completion friendly. For more complex
test runs, the run-test TEST="x" solution needs to be used.
The test specifications given in TEST is parsed into fully qualified test
descriptors, which clearly and unambigously show which tests will be run. As an
example, :tier1 will expand to jtreg:$(TOPDIR)/test/hotspot/jtreg:tier1 jtreg:$(TOPDIR)/test/jdk:tier1 jtreg:$(TOPDIR)/test/langtools:tier1 jtreg:$(TOPDIR)/test/nashorn:tier1 jtreg:$(TOPDIR)/test/jaxp:tier1. You can
always submit a list of fully qualified test descriptors in the TEST variable
if you want to shortcut the parser.
Ideally, all tests are run for every change but this may not be practical due to the limited testing resources, the scope of the change, etc.
The source tree currently defines a few common test groups in the relevant TEST.groups
files. There are test groups that cover a specific component, for example hotspot_gc.
It is a good idea to look into TEST.groups files to get a sense what tests are relevant
to a particular JDK component.
Component-specific tests may miss some unintended consequences of a change, so other tests should also be run. Again, it might be impractical to run all tests, and therefore tiered test groups exist. Tiered test groups are not component-specific, but rather cover the significant parts of the entire JDK.
Multiple tiers allow balancing test coverage and testing costs. Lower test tiers are supposed to contain the simpler, quicker and more stable tests. Higher tiers are supposed to contain progressively more thorough, slower, and sometimes less stable tests, or the tests that require special configuration.
Contributors are expected to run the tests for the areas that are changed, and the first N tiers they can afford to run, but at least tier1.
A brief description of the tiered test groups:
-
tier1: This is the lowest test tier. Multiple developers run these tests every day. Because of the widespread use, the tests intier1are carefully selected and optimized to run fast, and to run in the most stable manner. The test failures intier1are usually followed up on quickly, either with fixes, or adding relevant tests to problem list. GitHub Actions workflows, if enabled, runtier1tests. -
tier2: This test group covers even more ground. These contain, among other things, tests that either run for too long to be attier1, or may require special configuration, or tests that are less stable, or cover the broader range of non-core JVM and JDK features/components (for example, XML). -
tier3: This test group includes more stressful tests, the tests for corner cases not covered by previous tiers, plus the tests that require GUIs. As such, this suite should either be run with low concurrency (TEST_JOBS=1), or without headful tests (JTREG_KEYWORDS=\!headful), or both. -
tier4: This test group includes every other test not covered by previous tiers. It includes, for example,vmTestbasesuites for Hotspot, which run for many hours even on large machines. It also runs GUI tests, so the sameTEST_JOBSandJTREG_KEYWORDScaveats apply.
JTReg tests can be selected either by picking a JTReg test group, or a selection of files or directories containing JTReg tests.
JTReg test groups can be specified either without a test root, e.g. :tier1
(or tier1, the initial colon is optional), or with, e.g. hotspot:tier1,
test/jdk:jdk_util or $(TOPDIR)/test/hotspot/jtreg:hotspot_all. The test
root can be specified either as an absolute path, or a path relative to the
JDK top directory, or the test directory. For simplicity, the hotspot
JTReg test root, which really is hotspot/jtreg can be abbreviated as
just hotspot.
When specified without a test root, all matching groups from all test roots will be added. Otherwise, only the group from the specified test root will be added.
Individual JTReg tests or directories containing JTReg tests can also be
specified, like test/hotspot/jtreg/native_sanity/JniVersion.java or
hotspot/jtreg/native_sanity. Just like for test root selection, you can
either specify an absolute path (which can even point to JTReg tests outside
the source tree), or a path relative to either the JDK top directory or the
test directory. hotspot can be used as an alias for hotspot/jtreg here as
well.
As long as the test groups or test paths can be uniquely resolved, you do not
need to enter the jtreg: prefix. If this is not possible, or if you want to
use a fully qualified test descriptor, add jtreg:, e.g.
jtreg:test/hotspot/jtreg/native_sanity.
Since the Hotspot Gtest suite is so quick, the default is to run all tests.
This is specified by just gtest, or as a fully qualified test descriptor
gtest:all.
If you want, you can single out an individual test or a group of tests, for
instance gtest:LogDecorations or gtest:LogDecorations.level_test_vm. This
can be particularly useful if you want to run a shaky test repeatedly.
For Gtest, there is a separate test suite for each JVM variant. The JVM variant
is defined by adding /<variant> to the test descriptor, e.g.
gtest:Log/client. If you specify no variant, gtest will run once for each JVM
variant present (e.g. server, client). So if you only have the server JVM
present, then gtest:all will be equivalent to gtest:all/server.
At the end of the test run, a summary of all tests run will be presented. This will have a consistent look, regardless of what test suites were used. This is a sample summary:
==============================
Test summary
==============================
TEST TOTAL PASS FAIL ERROR
>> jtreg:jdk/test:tier1 1867 1865 2 0 <<
jtreg:langtools/test:tier1 4711 4711 0 0
jtreg:nashorn/test:tier1 133 133 0 0
==============================
TEST FAILURE
Tests where the number of TOTAL tests does not equal the number of PASSed tests
will be considered a test failure. These are marked with the >> ... << marker
for easy identification.
The classification of non-passed tests differs a bit between test suites. In the summary, ERROR is used as a catch-all for tests that neither passed nor are classified as failed by the framework. This might indicate test framework error, timeout or other problems.
In case of test failures, make run-test will exit with a non-zero exit value.
All tests have their result stored in build/$BUILD/test-results/$TEST_ID,
where TEST_ID is a path-safe conversion from the fully qualified test
descriptor, e.g. for jtreg:jdk/test:tier1 the TEST_ID is
jtreg_jdk_test_tier1. This path is also printed in the log at the end of the
test run.
Additional work data is stored in build/$BUILD/test-support/$TEST_ID. For
some frameworks, this directory might contain information that is useful in
determining the cause of a failed test.
It is possible to control various aspects of the test suites using make control variables.
These variables use a keyword=value approach to allow multiple values to be
set. So, for instance, JTREG="JOBS=1;TIMEOUT=8" will set the JTReg
concurrency level to 1 and the timeout factor to 8. This is equivalent to
setting JTREG_JOBS=1 JTREG_TIMEOUT=8, but using the keyword format means that
the JTREG variable is parsed and verified for correctness, so
JTREG="TMIEOUT=8" would give an error, while JTREG_TMIEOUT=8 would just
pass unnoticed.
To separate multiple keyword=value pairs, use ; (semicolon). Since the shell
normally eats ;, the recommended usage is to write the assignment inside
qoutes, e.g. JTREG="...;...". This will also make sure spaces are preserved,
as in JTREG="VM_OPTIONS=-XshowSettings -Xlog:gc+ref=debug".
(Other ways are possible, e.g. using backslash: JTREG=JOBS=1\;TIMEOUT=8.
Also, as a special technique, the string %20 will be replaced with space for
certain options, e.g. JTREG=VM_OPTIONS=-XshowSettings%20-Xlog:gc+ref=debug.
This can be useful if you have layers of scripts and have trouble getting
proper quoting of command line arguments through.)
As far as possible, the names of the keywords have been standardized between test suites.
Some keywords are valid across different test suites. If you want to run tests from multiple test suites, or just don't want to care which test suite specific control variable to use, then you can use the general TEST_OPTS control variable.
There are also some keywords that applies globally to the test runner system, not to any specific test suites. These are also available as TEST_OPTS keywords.
Currently only applies to JTReg.
Currently only applies to JTReg.
Applies to JTReg, GTest and Micro.
Applies to JTReg, GTest and Micro.
Applies to JTReg and GTest.
The test concurrency (-concurrency).
Defaults to TEST_JOBS (if set by --with-test-jobs=), otherwise it defaults to
JOBS, except for Hotspot, where the default is number of CPU cores/2, but
never more than 12.
The timeout factor (-timeoutFactor).
Defaults to 4.
The test mode (-agentvm, -samevm or -othervm).
Defaults to -agentvm.
Enable asserts (-ea -esa, or none).
Set to true or false. If true, adds -ea -esa. Defaults to true, except
for hotspot.
The verbosity level (-verbose).
Defaults to fail,error,summary.
What test data to retain (-retain).
Defaults to fail,error.
Limit memory consumption (-Xmx and -vmoption:-Xmx, or none).
Limit memory consumption for JTReg test framework and VM under test. Set to 0 to disable the limits.
Defaults to 512m, except for hotspot, where it defaults to 0 (no limit).
JTReg kewords sent to JTReg using -k. Please be careful in making sure that
spaces and special characters (like !) are properly quoted. To avoid some
issues, the special value %20 can be used instead of space.
Use additional problem lists file or files, in addition to the default ProblemList.txt located at the JTReg test roots.
If multiple file names are specified, they should be separated by space (or, to
help avoid quoting issues, the special value %20).
The file names should be either absolute, or relative to the JTReg test root of the tests to be run.
Use the problem lists to select tests instead of excluding them.
Set to true or false.
If true, JTReg will use -match: option, otherwise -exclude: will be used.
Default is false.
Additional options to the JTReg test framework.
Use JTREG="OPTIONS=--help all" to see all available JTReg options.
Additional Java options to JTReg (-javaoption).
Additional VM options to JTReg (-vmoption).
Generate AOT modules before testing for the specified module, or set of
modules. If multiple modules are specified, they should be separated by space
(or, to help avoid quoting issues, the special value %20).
Retry failed tests up to a set number of times, until they pass. This allows to pass the tests with intermittent failures. Defaults to 0.
Repeat the tests up to a set number of times, stopping at first failure. This helps to reproduce intermittent test failures. Defaults to 0.
The number of times to repeat the tests (--gtest_repeat).
Default is 1. Set to -1 to repeat indefinitely. This can be especially useful
combined with OPTIONS=--gtest_break_on_failure to reproduce an intermittent
problem.
Additional options to the Gtest test framework.
Use GTEST="OPTIONS=--help" to see all available Gtest options.
Generate AOT modules before testing for the specified module, or set of
modules. If multiple modules are specified, they should be separated by space
(or, to help avoid quoting issues, the special value %20).
Docker tests with default parameters may fail on systems with glibc versions not compatible with the one used in the default docker image (e.g., Oracle Linux 7.6 for x86). For example, they pass on Ubuntu 16.04 but fail on Ubuntu 18.04 if run like this on x86:
$ make run-test TEST="jtreg:test/hotspot/jtreg/containers/docker"
To run these tests correctly, additional parameters for the correct docker image are
required on Ubuntu 18.04 by using JAVA_OPTIONS.
$ make run-test TEST="jtreg:test/hotspot/jtreg/containers/docker" JTREG="JAVA_OPTIONS=-Djdk.test.docker.image.name=ubuntu -Djdk.test.docker.image.version=latest"
It is highly recommended to use the latest NSS version when running PKCS11 tests.
Improper NSS version may lead to unexpected failures which are hard to diagnose.
For example, sun/security/pkcs11/Secmod/AddTrustedCert.java may fail on Ubuntu
18.04 with the default NSS version in the system.
To run these tests correctly, the system property jdk.test.lib.artifacts.<NAME> is required on
Ubuntu 18.04 to specify the alternative NSS lib directory. The <NAME>
component should be replaced with the name element of the appropriate
@Artifact class. (See test/jdk/sun/security/pkcs11/PKCS11Test.java)
For example:
$ make test TEST="jtreg:sun/security/pkcs11/Secmod/AddTrustedCert.java" JTREG="JAVA_OPTIONS=-Djdk.test.lib.artifacts.nsslib-linux_aarch64=/path/to/NSS-libs"
For more notes about the PKCS11 tests, please refer to test/jdk/sun/security/pkcs11/README.
Some Client UI tests use key sequences which may be reserved by the operating system. Usually that causes the test failure. So it is highly recommended to disable system key shortcuts prior testing. The steps to access and disable system key shortcuts for various platforms are provided below.
Choose Apple menu; System Preferences, click Keyboard, then click Shortcuts; select or deselect desired shortcut.
For example, test/jdk/javax/swing/TooltipManager/JMenuItemToolTipKeyBindingsTest/JMenuItemToolTipKeyBindingsTest.java fails
on MacOS because it uses CTRL + F1 key sequence to show or hide tooltip message
but the key combination is reserved by the operating system. To run the test correctly
the default global key shortcut should be disabled using the steps described above, and then deselect
"Turn keyboard access on or off" option which is responsible for CTRL + F1 combination.
Open the Activities overview and start typing Settings; Choose Settings, click Devices, then click Keyboard; set or override desired shortcut.
Type gpedit in the Search and then click Edit group policy; navigate to
User Configuration -> Administrative Templates -> Windows Components -> File Explorer;
in the right-side pane look for "Turn off Windows key hotkeys" and double click on it;
enable or disable hotkeys.
Note: restart is required to make the settings take effect.
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