This README file describes the files and directories related -*- rst -*-
to the Python test suite under the current 'test' directory.
- dotest.py
Provides the test driver for the test suite. To invoke it, cd to the 'test'
directory and issue the './dotest.py' command or './dotest.py -v' for more
verbose output. '.dotest.py -h' prints out the help messge.
A specific naming pattern is followed by the .py script under the 'test'
directory in order to be recognized by 'dotest.py' test driver as a module
which implements a test case, namely, Test*.py.
Some example usages:
1. ./dotest.py -v . 2> ~/Developer/Log/lldbtest.log0
This runs the test suite and directs the run log to a file.
2. LLDB_LOG=/tmp/lldb.log GDB_REMOTE_LOG=/tmp/gdb-remote.log ./dotest.py -v . 2> ~/Developer/Log/lldbtest.log
This runs the test suite, with logging turned on for the lldb as well as
the process.gdb-remote channels and directs the run log to a file.
- lldbtest.py
Provides an abstract base class of lldb test case named 'TestBase', which in
turn inherits from Python's unittest.TestCase. The concrete subclass can
override lldbtest.TestBase in order to inherit the common behavior for
unittest.TestCase.setUp/tearDown implemented in this file.
To provide a test case, the concrete subclass provides methods whose names
start with the letters test. For more details about the Python's unittest
framework, go to http://docs.python.org/library/unittest.html.
./command_source/TestCommandSource.py provides a simple example of test case
which overrides lldbtest.TestBase to exercise the lldb's 'command source'
command.
The doc string provides more details about the setup required for running a
test case on its own. To run the whole test suite, 'dotest.py' is all you
need to do.
- subdirectories of 'test'
Most of them predate the introduction of the python test suite and contain
example C/C++/ObjC source files which get compiled into executables which are
to be exercised by the debugger.
For such subdirectory which has an associated Test*.py file, it was added as
part of the Python-based test suite to test lldb functionality.
Some of the subdirectories, for example, the 'help' subdirectory, do not have
C/C++/ObjC source files; they were created to house the Python test case which
does not involve lldb reading in an executable file at all.
The sample_test directory contains examples of both a full and an "inline"
testcase that run a process to a breakpoint and check a local variable. These
are convenient starting points for adding new tests.
- make directory
Contains Makefile.rules, which can be utilized by test cases to write Makefile
based rules to build binaries for the inferiors.
By default, the built executable name is a.out, which can be overwritten by
specifying your EXE make variable, via the Makefile under the specific test
directory or via supplying a Python dictionary to the build method in your
Python test script. An example of the latter can be found in
test/lang/objc/radar-9691614/TestObjCMethodReturningBOOL.py, where:
def test_method_ret_BOOL(self):
"""Test that objective-c method returning BOOL works correctly."""
d = {'EXE': self.exe_name}
self.build(dictionary=d)
self.setTearDownCleanup(dictionary=d)
...
def setUp(self):
# Call super's setUp().
TestBase.setUp(self)
# We'll use the test method name as the exe_name.
self.exe_name = self.testMethodName
# Find the line number to break inside main().
self.main_source = "main.m"
self.line = line_number(self.main_source, '// Set breakpoint here.')
The exe names for the two test methods are equal to the test method names and
are therefore guaranteed different.
- plugins directory
Contains platform specific plugin to build binaries with dsym/dwarf debugging
info. Other platform specific functionalities may be added in the future.
- Profiling dotest.py runs
I used the following command line thingy to do the profiling on a SnowLeopard
machine:
$ DOTEST_PROFILE=YES DOTEST_SCRIPT_DIR=/Volumes/data/lldb/svn/trunk/test /System/Library/Frameworks/Python.framework/Versions/Current/lib/python2.6/cProfile.py -o my.profile ./dotest.py -v -w 2> ~/Developer/Log/lldbtest.log
After that, I used the pstats.py module to browse the statistics:
$ python /System/Library/Frameworks/Python.framework/Versions/Current/lib/python2.6/pstats.py my.profile
- Writing test cases:
We strongly prefer writing test cases using the SB API's rather than
the runCmd & expect. Unless you are actually testing some feature
of the command line, please don't write command based tests. For
historical reasons there are plenty of examples of tests in the test
suite that use runCmd where they shouldn't, but don't copy them,
copy the plenty that do use the SB API's instead.
The reason for this is that our policy is that we will maintain
compatibility with the SB API's. But we don't make any similar
guarantee about the details of command result format. If your test
is using the command line, it is going to have to check against the
command result text, and you either end up writing your check
pattern by checking as little as possible so you won't be exposed to
random changes in the text; in which case you can end up missing
some failure, or you test too much and it means irrelevant changes
break your tests.
However, if you use the Python API's it is possible to check all the
results you want to check in a very explicit way, which makes the
tests much more robust.
Even if you are testing that a command-line command does some
specific thing, it is still better in general to use the SB API's to
drive to the point where you want to run the test, then use
SBInterpreter::HandleCommand to run the command. You get the full
result text from the command in the command return object, and all
the part where you are driving the debugger to the point you want to
test will be more robust.
The sample_test directory contains a standard and an "inline" test
that are good starting points for writing a new test.
- Attaching in test cases:
If you need to attach to inferiors in your tests, you must make sure
the inferior calls lldb_enable_attach(), before the debugger
attempts to attach. This function performs any platform-specific
processing needed to enable attaching to this process (e.g., on
Linux, we execute prctl(PR_SET_TRACER) syscall to disable
protections present in some Linux systems).
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