rohks 32c9d62d39 Add DataSource contract tests to verify offset and position
These tests addresses two identified gaps in the contract:
 - Ensures that the output buffer offset passed to the `DataSource.read` method is correctly applied.
 - Verifies that the position within the input stream is properly incremented when reading in two parts.

PiperOrigin-RevId: 656358935
2024-07-26 05:14:51 -07:00
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Test utils module

Provides utility classes for media unit and instrumentation tests.