This unit test compares the DST transitions calculated by the
ExtendedZoneProcessor class (which uses the zonedbx data files) with the
validation_data.cpp file generated by the Java
../../tools/compare_java/TestDataGenerator.java program.
The Java program generates about 260,000 data points spanning the year 2000 to 2050. It is too large to run on any Arduino board that I am aware of, including the ESP32. However it does run on a Linux machine using the UnixHostDuino adapter layer.
Assuming that you have g++ and make installed, just type:
$ make clean && make -j 4
$ make runtests
TestRunner started on 384 test(s).
Test ExtendedTransitionTest_Africa_Abidjan passed.
...
Test ExtendedTransitionTest_Pacific_Wallis passed.
TestRunner duration: 0.113 seconds.
test(s).
TestRunner summary: 384 passed, 0 failed, 0 skipped, 0 timed out, out of 384 test(s).
$ make clean
The TZ Database version used by the TestDataGenerator.java program and the
version that generated the zonedbx files must match for this unit test to
succeed. For example, one of JDK versions used to run this test was openjdk version "11.0.3" 2019-04-16 (see java -version) which seems to use version
2018g. So the Makefile generates the zoneinfo files for 2018g` specifically
for this test.
The Makefile assumes that you have already compiled the
TestDataGenerator.java program into TestDataGenerator.class. Type the
following if you have not done so:
$ cd .../tools/compare_java
$ make