BLOB Format tests are wrong

[jyutzler]

http://geopackage.org/spec/#_data_23

Test method 3.c.iv.

• ST_IsEmpty is not part of the specification. This clause should be removed.
• "gc.flags.envelope != 0 and envelope values are not NaN" is illogical. Maybe the original author got the logic backwards? But anyway, the envelope flag determines the presence/absence of envelope values and indicates the size. There is no obvious way to test whether the bytes in the envelope position constitute a valid envelope. This clause pertains to the SHALL statement at the very end of 2.1.3.1.1.

I recommend dropping all of 3.c.iv. from the test.

http://geopackage.org/spec/#_data_24

/opt/features/geometry_encoding/data/core_types_existing_sparse_data

• Test method 5.b.ii. is not testable; recommend removing
• Test methods 5.b.iii-vi seem to be overreach - there is no explicit requirement that geometries must stay within the specified envelope; recommend removing
• Test method 5.b.vii is reasonable. Maybe this one can be moved to the previous test and this test can be otherwise removed.

/opt/features/geometry_encoding/data/core_types_all_types_test_data

This test is not appropriate for a data encoding standard. It is more of a test of a client capability. Recommend removing.

[jyutzler]

Note there is some overlap with #288 here. The corrective action there applies here as well.

• Remove dependencies on SpatiaLite
• Update wording for test for extents
• Note that 5.b.ii requires a spatial library
• Remove 5.b.iii-vi
• Move 5.b.vii to previous test
• Remove tests that pertain to a client app

[jyutzler]

Approved by the SWG today.