first commit for openGauss connect odbc code

test/README.txt

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+This directory contains a regression test suite for the psqlODBC driver.
+
+Prerequisites
+-------------
+
+To run the regression tests, you must have a PostgreSQL server running and
+accepting connections from the host where you run the regression tests.
+
+By default in Linux, the regression tests use the driver built from the
+parent directory, ../.libs/psqlodbcw.so, for the tests. You can edit
+odbcinst.ini in this directory to test a different version.
+
+Running the tests
+-----------------
+
+Linux
+=====
+
+To run the test suite, type:
+
+  make installcheck
+
+The test suite uses the normal ODBC / libpq defaults, which assume that the
+server is running on the same host, at port 5432, and the username is the
+same as the OS username. You can use PGHOST, PGUSER, etc. environment
+variables or .pgpass to override these defaults.
+
+You can also run "make installcheck-all" to run the regression suite with
+different combinations of configuration options.
+
+Windows
+=======
+
+To run the test suite, you need first to build and install the driver, and
+create a Data Source with the name "psqlodbc_test_dsn". This DSN is used by
+all the regression tests, and it should point to a valid PostgreSQL server.
+
+Then type the following commands to run the tests:
+
+  nmake /f win.mak
+  nmake /f win.mak installcheck
+
+Development
+-----------
+
+To add a test, add a *-test.c file to src/ directory, using one of the
+existing tests as example. Also add the test to the TESTS list in the
+"tests" file, and create an expected output file in expected/ directory.
+
+The current test suite only tests a small fraction of the codebase. Whenever
+you add a new feature, or fix a non-trivial bug, please add a test case to
+cover it.