PL/SQL Unit Testing Can Be Fun

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Presentation at Miracle Open World 2012

Published in: Technology

PL/SQL Unit Testing Can Be Fun

  1. 1. PL/SQL Unit Testing Can Be Fun! with a little help from Ruby
  2. 2. Raimonds Simanovskis github.com/rsim @rsim .com
  3. 3. What is good code? Test Correct functionality! TestFast enough performance! Test afterMaintainable changes!
  4. 4. How is it done? try something... dbms_output.put_line(...) it is obvious that there are no bugstesters should test, that’s their job
  5. 5. What are typical problems? Trying and not testing Tests are not repeatable Manual verification of resultsTesting is done too late in development
  6. 6. Types of tests unit tests integration tests programmer’s performance & load responsibility testsexploratory & usability tests
  7. 7. Test Driven Development
  8. 8. Good unit tests Automatic, run fastWide code coverage including edge cases Repeatable Independent from execution order Using real and understandable test data
  9. 9. How to do it when programming in PL/SQL?
  10. 10. created by Steven Feuerstein, 1999based on “xUnit”-style frameworks not maintained anymore :(
  11. 11. Example substring from start until end positionCREATE OR REPLACE FUNCTION betwnstr ( string_in IN VARCHAR2, start_in IN INTEGER, end_in IN INTEGER) RETURN VARCHAR2IS l_start PLS_INTEGER := start_in;BEGIN IF l_start = 0 THEN l_start := 1; END IF; RETURN (SUBSTR (string_in, l_start, end_in - l_start + 1));END;
  12. 12. TestsCREATE OR REPLACE PACKAGE ut_betwnstr AS CREATE OR REPLACE PACKAGE BODY ut_betwnstr AS PROCEDURE ut_setup; PROCEDURE ut_setup AS PROCEDURE ut_teardown; BEGIN NULL; PROCEDURE ut_normal_usage; END ut_setup; PROCEDURE ut_first_index_null; PROCEDURE ut_teardown ASEND ut_betwnstr; BEGIN NULL; END ut_teardown; PROCEDURE ut_normal_usage AS BEGIN utassert.eq(Normal usage, betwnstr(abcdefg, 2, 5), bcde); END ut_normal_usage; PROCEDURE ut_first_index_null AS BEGIN utassert.isnull(First index is null, betwnstr(abcdefg, NULL, 5)); END ut_first_index_null; END ut_betwnstr;
  13. 13. Results exec utplsql.test(betwnstr, recompile_in => FALSE);.> SSSS U U CCC CCC EEEEEEE SSSS SSSS> S S U U C C C C E S S S S> S U U C C C C E S S> S U U C C E S S> SSSS U U C C EEEE SSSS SSSS> S U U C C E S S> S U U C C C C E S S> S S U U C C C C E S S S S> SSSS UUU CCC CCC EEEEEEE SSSS SSSS. SUCCESS: "betwnstr".> Individual Test Case Results:>SUCCESS - betwnstr.UT_FIRST_INDEX_NULL: ISNULL "First index is null" Expected "" and got "">SUCCESS - betwnstr.UT_NORMAL_USAGE: EQ "Normal usage" Expected "cde" and got "cde">>> Errors recorded in utPLSQL Error Log:>> NONE FOUND
  14. 14. Visual testing toolsQuest Code Tester SQL Developer >= 2.1
  15. 15. Why used just by few? Too large / too verbose test code? Hard to read, too much noise? Hard to test complex cases?No best practices how to write tests? Nobody is using, why should I use?
  16. 16. ruby-plsql-spec ideal language for writing tests powerful testing tools RSpec with “readable” syntax library for callingruby-plsql PL/SQL procedures from Ruby
  17. 17. Demo
  18. 18. ruby-plsql gemplsql.connect! "hr","hr","xe"plsql.test_uppercase(xxx) # => "XXX"plsql.test_uppercase(:p_string => xxx) # => "XXX"plsql.test_copy("abc", nil, nil) # => { :p_to => "abc", # :p_to_double => "abcabc" }plsql.test_copy(:p_from => "abc", :p_to => nil, :p_to_double => nil) # => { :p_to => "abc", # :p_to_double => "abcabc" }plsql.hr.test_uppercase(xxx) # => "XXX"plsql.test_package.test_uppercase(xxx) # => XXXplsql.hr.test_package.test_uppercase(xxx) # => XXXplsql.logoff
  19. 19. Benefits Compact, readable syntaxPowerful features also for complex tests Best practices from Ruby community Based on needs from real projects Open-source – “free as in beer” :)
  20. 20. More information http://blog.rayapps.com/2009/11/27/oracle-plsql- unit-testing-with-ruby/http://blog.rayapps.com/2010/01/06/screencasts-of- oracle-plsql-unit-testing-with-ruby/ http://github.com/rsim/ruby-plsql-spec

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