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ART Testing
There are two suites of tests in the Android Runtime (ART):
- ART run-tests: Tests of the ART runtime using Dex bytecode (mostly written in Java).
- ART gtests: C++ tests exercising various aspects of ART.
ART run-tests
ART run-tests are tests exercising the runtime using Dex bytecode. They are
written in Java and/or Smali
(compiled/assembled as Dex bytecode) and sometimes native code (written as C/C++
testing libraries). Some tests also make use of the
Jasmin assembler or the
ASM bytecode manipulation tool. Run-tests are
executed on the ART runtime (dalvikvm), possibly preceded by a
pre-optimization of the Dex code (using dex2oat).
The run-tests are identified by directories in this test directory, named with
a numeric prefix and containing an info.txt file. For most run tests, the
sources are in the src subdirectory. Sources found in the src2 directory are
compiled separately but to the same output directory; this can be used to
exercise "API mismatch" situations by replacing class files created in the first
pass. The src-ex directory is built separately, and is intended for exercising
class loaders. Resources can be stored in the res directory, which is
distributed together with the executable files.
The run-tests logic lives in the test/run-test Bash script. The execution of a
run-test has three main parts: building the test, running the test, and checking
the test's output. By default, these three steps are implemented by three Bash
scripts located in the test/etc directory (default-build, default-run, and
default-check). These scripts rely on environment variables set by
test/run-test.
The default logic for all of these these steps (build, run, check) is overridden
if the test's directory contains a Bash script named after the step
(i.e. build, run, or check). Note that the default logic of the "run" step
is actually implemented in the "JAR runner" (test/etc/run-test-jar), invoked
by test/etc/default-run.
After the execution of a run-test, the check step's default behavior
(implemented in test/etc/default-check) is to respectively compare its
standard output and standard error with the contents of the
expected-stdout.txt and expected-stderr.txt files contained in the test's
directory; any mismatch triggers a test failure.
The test/run-test script handles the execution of a single run-test in a given
configuration. The Python script test/testrunner/testrunner.py is a convenient
script handling the construction and execution of multiple tests in one
configuration or more.
To see the invocation options supported by run-test and testrunner.py, run
these commands from the Android source top-level directory:
art/test/run-test --help
art/test/testrunner/testrunner.py --help
ART gtests
ART gtests are written in C++ using the Google
Test framework. These tests exercise
various aspects of the runtime (the logic in libart, libart-compiler, etc.)
and its binaries (dalvikvm, dex2oat, oatdump, etc.). Some of them are used
as unit tests to verify a particular construct in ART. These tests may depend on
some test Dex files and core images.
ART gtests are defined in various directories within the ART project (usually in
the same directory as the code they exercise). Their source files usually end
with the suffix _test.cc. The construction logic of these tests is implemented
in ART's build system (Android.bp and Android*.mk files). On host, these
gtests can be run by executing m test-art-host-gtest. On device, the
recommended approach is to run these tests in a chroot environment (see
README.chroot.md in this directory).
Test execution
All tests in either suite can be run using the art/test.py
script. Additionally, run-tests can be run individually. All of the tests can be
run on the build host, on a USB-attached device, or using the build host
"reference implementation".
ART also supports running target (device) tests in a chroot environment (see
README.chroot.md in this directory). This is currently the recommended way to
run tests on target (rather than using art/test.py --target).
To see command flags run:
$ art/test.py -h
Building tests
In general all tests require some dependencies to be built before they can be run.
In general you can pass the --build-dependencies flag (also available as short
option -b) to art/test.py program to automatically build required dependencies.
One can also directly use the various test-art-...-dependencies targets listed
below.
Running all tests on the build host
$ # Build test files
$ m test-art-host-run-test-dependencies
$ # Run the tests
$ art/test.py --host
Or:
$ art/test.py -b --host
Running all tests on the target device
$ # Build test files
$ m test-art-target-run-test-dependencies
$ # Run the tests
$ art/test.py --target
Or:
$ art/test.py -b --target
Running all gtests on the build host
$ art/test.py --host -g
Running all gtests on the target device
$ art/test.py --target -g
Running all run-tests on the build host
$ # Build test files
$ m test-art-host-run-test-dependencies
$ art/test.py --host -r
Or:
$ art/test.py -b --host -r
Running all run-tests on the target device
$ art/test.py --target -r
Running one run-test on the build host
$ # Build test files
$ m test-art-host-run-test-dependencies
$ # Run the tests
$ art/test.py --host -r -t 001-HelloWorld
Or:
$ art/test.py -b --host -r -t 001-HelloWorld
Running one run-test on the target device
$ art/test.py --target -r -t 001-HelloWorld
Running one gtest on the build host
$ find out/host/ -type f -name art_runtime_tests # Find the path of the test.
$ out/host/linux-x86/nativetest/art_runtime_tests/art_runtime_tests
Add "--no_isolate" to run the tests one by one in single process (disable forking). Add "--gtest_filter=..." to select specific sub-test(s) to run. Prefix by "gdb --args " to run the test in gdb.
ART Continuous Integration
Both ART run-tests and gtests are run continuously as part of ART's continuous integration. In addition, two other test suites are run continuously on this service: Libcore tests and JDWP tests.