Test framework should do the following things:

• Read OPENDAL_TEST as the scheme to test.
• Read all env values OPENDAL_{scheme}_{key}={value} and use the map to construct the operator.
• Perform the test logic upon operator, for example, write a file and read it back to verify checksum.

The usage will be like:

OPENDAL_TEST=memory make behavior_test

Tasks

• Add capability support to allow more test cases
• Implement test framework
• Add random root support