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--- a/HACKING
+++ b/HACKING
@@ -98,3 +98,47 @@ To make a release of D-BUS, do the following:
- post to message-bus-list@freedesktop.org announcing the release.
+
+Environment variables
+===
+
+These are the environment variables that are used by the D-BUS client library
+
+DBUS_VERBOSE=1
+Turns on printing verbose messages. This only works if D-BUS has been
+compiled with --enable-verbose-mode
+
+DBUS_MALLOC_FAIL_NTH=n
+Can be set to a number, causing every nth call to dbus_alloc or
+dbus_realloc to fail. This only works if D-BUS has been compiled with
+--enable-tests.
+
+DBUS_MALLOC_FAIL_GREATER_THAN=n
+Can be set to a number, causing every call to dbus_alloc or
+dbus_realloc to fail if the number of bytes to be allocated is greater
+than the specified number. This only works if D-BUS has been compiled with
+--enable-tests.
+
+Tests
+===
+
+These are the test programs that are built if dbus is compiled using
+--enable-tests.
+
+dbus/dbus-test
+This is the main unit test program that tests all aspects of the D-BUS
+client library.
+
+dbus/bus-test
+This it the unit test program for the message bus.
+
+test/break-loader
+A test that tries to break the message loader by passing it randomly
+created invalid messages.
+
+"make check" runs all the deterministic test programs (i.e. not break-loader).
+
+"make check-coverage" is available if you configure with --enable-gcov and
+gives a complete report on test suite coverage. You can also run
+"test/decode-gcov foo.c" on any source file to get annotated source,
+after running make check with a gcov-enabled tree.