Initializing your Repo client
Follow the instructions
to get and build the Android source code but specify a particular CTS branch
name, for example
-b android-5.0_r2, when issuing the
init command. This assures your CTS changes will be included in the
next CTS release and beyond.
Building and running CTS
Execute the following commands to build CTS and start the interactive CTS console:
Note: You may supply one of these other values
TARGET_PRODUCT to build for different architectures:
make cts -j32 TARGET_PRODUCT=aosp_arm64
At the cts-tf console, enter e.g.:
tf> run cts --plan CTS
Writing CTS tests
CTS tests use JUnit and the Android testing APIs. Review the
Testing and Instrumentation
tutorial while perusing the existing tests under the
cts/tests directory. You will see that CTS tests mostly follow the same
conventions used in other Android tests.
Since CTS runs across many production devices, the tests must follow these rules:
- Must take into account varying screen sizes, orientations, and keyboard layouts.
- Only use public API methods. In other words, avoid all classes, methods, and fields that are annotated with the "hide" annotation.
- Avoid relying upon particular view layouts or depend on the dimensions of assets that may not be on some device.
- Don't rely upon root privileges.
Test naming and location
Most CTS test cases target a specific class in the Android API. These tests
have Java package names with a
cts suffix and class names with the
Test suffix. Each test case consists of multiple tests, where each
test usually exercises a particular method of the class being tested.
These tests are arranged in a directory structure where tests are grouped into
different categories such as "widgets" and "views."
For example, the CTS test for the Java package
android.widget.cts.TextViewTest with its Java package name as
android.widget.cts and its class name as
- Java package name
The Java package name for the CTS tests is the package name of the class that the test is testing, followed by ".cts". For our example, the package name would be
- Class name
The class name for CTS tests is name of the class that the test is testing with "Test" appended. (For example, if a test is targeting
TextView, the class name should be
- Module name (CTS v2 only)
CTS v2 organizes tests by module. The module name is usually the second string of the Java package name (in our example,
widget), although it does not have to be.
The directory structure and sample code depend on whether you are using CTS v1 or CTS v2.
For Android 6.0 and earlier, use CTS v1. For CTS v1, the sample code is at
The directory structure in CTS v1 tests looks like this:
cts/ tests/ tests/ package-name/ Android.mk AndroidManifest.xml src/ android/ package-name/ SampleDeviceActivity.java cts/ SampleDeviceTest.java
For Android 7.0 and later, use CTS v2. For details, see the sample test in AOSP.
The CTS v2 directory structure looks like this:
cts/ tests/ module-name/ Android.mk AndroidManifest.xml src/ android/ package-name/ SampleDeviceActivity.java cts/ SampleDeviceTest.java
New sample packages
When adding new tests, there may not be an existing directory to place your test. In those cases, you'll need to create the directory and copy the appropriate sample files.
If you are using CTS v1, refer to the example under
cts/tests/tests/example and create a new directory. Also,
make sure to add your new package's module name from its
cts/CtsTestCaseList.mk. This Makefile is used by
build/core/tasks/cts.mk to combine all the tests together to create
the final CTS package.
Use the sample test
to quick start your new test module with following steps:
- Run this command to create the test directory and copy sample files to it:
mkdir cts/tests/module-name && cp -r cts/tests/sample/* cts/tests/module-name
- Navigate to
cts/tests/module-nameand substitute all instances of "[Ss]ample" following the recommended naming convention from above.
SampleDeviceActivityto exercise the feature you're testing.
SampleDeviceTestto ensure the activity succeeds or logs its errors.
Other Android directories such as
res can also be added. To add JNI code,
create a directory in the root of the project next to
src with the native
code and an
Android.mk in it.
The makefile typically contains the following settings:
LOCAL_PATH := $(call my-dir) include $(CLEAR_VARS) LOCAL_MODULE := libCtsSample_jni # don't include this package in any target LOCAL_MODULE_TAGS := optional LOCAL_SRC_FILES := list of source code files LOCAL_C_INCLUDES := $(JNI_H_INCLUDE) # Tag this module as a cts test artifact LOCAL_COMPATIBILITY_SUITE := cts LOCAL_SHARED_LIBRARIES := libnativehelper LOCAL_SDK_VERSION := current include $(BUILD_SHARED_LIBRARY)
Android.mk file in the root of the project will
need to be modified to build the native code and depend on it, as shown
# All tests should include android.test.runner. LOCAL_JAVA_LIBRARIES := android.test.runner # Includes the jni code as a shared library LOCAL_JNI_SHARED_LIBRARIES := libCtsSample_jni # Include for InstrumentationCtsTestRunner LOCAL_STATIC_JAVA_LIBRARIES := ctstestrunner... LOCAL_SDK_VERSION := currentinclude $(BUILD_CTS_PACKAGE) #Tells make to look in subdirectories for more make files to include include $(call all-makefiles-under,$(LOCAL_PATH))
Fix or remove tests
Besides adding new tests there are other ways to contribute to CTS: Fix or remove tests annotated with "BrokenTest" or "KnownFailure."
Submitting your changes
Follow the Submitting Patches workflow to contribute changes to CTS. A reviewer will be assigned to your change, and your change should be reviewed shortly!
Release schedule and branch information
CTS releases follow this schedule.
Note: This schedule is tentative and may be updated from time to time as CTS for the given Android version matures.
|No releases are planned for 5.1, 5.0, 4.4, 4.3 and 4.2.|
Important Dates during month of the release
- End of 1st Week: Code Freeze. At this point, submissions on the current branch will no longer be accepted and will not be included in the next version of CTS. Once we have chosen a candidate for release, the branch will again be open and accepting new submissions.
- Second or third week: CTS is published in the Android Open Source Project (AOSP).
CTS development branches have been set up so that changes submitted to each
branch will automatically merge as below:
marshmallow-cts-dev -> nougat-cts-dev -> nougat-mr1-cts-dev -> oreo-cts-dev -> oreo-mr1-cts-dev -> pie-cts-dev -> <private-development-branch for Android Q>
If a changelist (CL) fails to merge correctly, the author of the CL will get an email with instructions on how to resolve the conflict. In most of the cases, the author of the CL can use the instructions to skip the auto-merge of the conflicting CL.
Additionally, if an older branch requires the change, then the CL needs to be cherry-picked from the newer branch.