[Fixtures/Testing] Treatments - Chemical

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Describe the task

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Create fixtures of Treatment Records in the Database to facilitate Testing of the new record types.
Implement Tests using the fixtures to eliminate regressions

Value Add

• Fixtures Populate the testing DB with expected values.
• Tests help catch and prevent regressions from occurring at later points in time

Acceptance Criteria

• Create Fixture for all Treatment Subtypes
• Create tests for all Serializers of Treatment Subtypes

Additional Context