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+This directory contains tests for various Vim features.
+For testing an indent script see runtime/indent/testdir/README.txt.
+
+If it makes sense, add a new test method to an already existing file. You may
+want to separate it from other tests with comment lines.
+
+TO ADD A NEW STYLE TEST:
+
+1) Create a test_<subject>.vim file.
+2) Add test_<subject>.res to NEW_TESTS_RES in Make_all.mak in alphabetical
+ order.
+3) Also add an entry "test_<subject>" to NEW_TESTS in Make_all.mak.
+4) Use make test_<subject> to run a single test.
+
+At 2), instead of running the test separately, it can be included in
+"test_alot". Do this for quick tests without side effects. The test runs a
+bit faster, because Vim doesn't have to be started, one Vim instance runs many
+tests.
+
+At 4), to run a test in GUI, add "GUI_FLAG=-g" to the make command.
+
+
+What you can use (see test_assert.vim for an example):
+
+- Call assert_equal(), assert_true(), assert_false(), etc.
+
+- Use assert_fails() to check for expected errors.
+
+- Use try/catch to avoid an exception aborts the test.
+
+- Use test_alloc_fail() to have memory allocation fail. This makes it possible
+ to check memory allocation failures are handled gracefully. You need to
+ change the source code to add an ID to the allocation. Add a new one to
+ alloc_id_T, before aid_last.
+
+- Use test_override() to make Vim behave differently, e.g. if char_avail()
+ must return FALSE for a while. E.g. to trigger the CursorMovedI autocommand
+ event. See test_cursor_func.vim for an example.
+
+- If the bug that is being tested isn't fixed yet, you can throw an exception
+ with "Skipped" so that it's clear this still needs work. E.g.: throw
+ "Skipped: Bug with <c-e> and popupmenu not fixed yet"
+
+- The following environment variables are recognized and can be set to
+ influence the behavior of the test suite (see runtest.vim for details)
+
+ - $TEST_MAY_FAIL=Test_channel_one - ignore those failing tests
+ - $TEST_FILTER=Test_channel - only run test that match this pattern
+ - $TEST_SKIP_PAT=Test_channel - skip tests that match this pattern
+ - $TEST_NO_RETRY=yes - do not try to re-run failing tests
+ You can also set them in Vim:
+ :let $TEST_MAY_FAIL = 'Test_channel_one'
+ :let $TEST_FILTER = '_set_mode'
+ :let $TEST_SKIP_PAT = 'Test_loop_forever'
+ :let $TEST_NO_RETRY = 'yes'
+ Use an empty string to revert, e.g.:
+ :let $TEST_FILTER = ''
+
+- See the start of runtest.vim for more help.
+
+
+TO ADD A SCREEN DUMP TEST:
+
+Mostly the same as writing a new style test. Additionally, see help on
+"terminal-dumptest". Put the reference dump in "dumps/Test_func_name.dump".
+
+
+OLD STYLE TESTS:
+
+There are a few tests that are used when Vim was built without the +eval
+feature. These cannot use the "assert" functions, therefore they consist of a
+.in file that contains Normal mode commands between STARTTEST and ENDTEST.
+They modify the file and the result gets written in the test.out file. This
+is then compared with the .ok file. If they are equal the test passed. If
+they differ the test failed.
+
+
+RUNNING THE TESTS:
+
+To run a single test from the src directory:
+
+ $ make test_<name>
+
+The below commands should be run from the src/testdir directory.
+
+To run a single test:
+
+ $ make test_<name>.res
+
+The file 'messages' contains the messages generated by the test script. If a
+test fails, then the test.log file contains the error messages. If all the
+tests are successful, then this file will be an empty file.
+
+- To run a single test function from a test script:
+
+ $ ../vim -u NONE -S runtest.vim <test_file>.vim <function_name>
+
+- To execute only specific test functions, add a second argument:
+
+ $ ../vim -u NONE -S runtest.vim test_channel.vim open_delay
+
+
+- To run all the tests:
+
+ $ make
+
+- To run the test on MS-Windows using the MSVC nmake:
+
+ > nmake -f Make_mvc.mak
+
+- To run the tests with GUI Vim:
+
+ $ make GUI_FLAG=-g
+
+ or
+
+ $ make VIMPROG=../gvim
+
+- To cleanup the temporary files after running the tests:
+
+ $ make clean