Add coverage tests for 4 untested variables

changelog_entry.yaml

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+- bump: patch
+  changes:
+    added:
+      - Add tests for tax_unit_state, emp_self_emp_ratio, is_premium_free_part_a, and savers_credit_credit_limit variables

policyengine_us/tests/variables/gov/hhs/medicare/eligibility/part_a/is_premium_free_part_a.yaml

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+- name: Person with 40 quarters qualifies for premium-free Part A
+  period: 2024
+  input:
+    age: 66
+    medicare_quarters_of_coverage: 40
+  output:
+    is_premium_free_part_a: true
+
+- name: Person with more than 40 quarters qualifies for premium-free Part A
+  period: 2024
+  input:
+    age: 66
+    medicare_quarters_of_coverage: 50
+  output:
+    is_premium_free_part_a: true
+
+- name: Person with less than 40 quarters does not qualify
+  period: 2024
+  input:
+    age: 66
+    medicare_quarters_of_coverage: 39
+  output:
+    is_premium_free_part_a: false
+
+- name: Person not Medicare eligible returns zero
+  period: 2024
+  input:
+    age: 50
+    medicare_quarters_of_coverage: 40
+  output:
+    is_premium_free_part_a: false

policyengine_us/tests/variables/gov/irs/credits/retirement_savings/savers_credit_credit_limit.yaml

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+- name: Savers credit limit equals income tax before credits with no preceding credits
+  period: 2024
+  input:
+    income_tax_before_credits: 5000
+  output:
+    savers_credit_credit_limit: 5000
+
+- name: Savers credit limit is zero when income tax before credits is zero
+  period: 2024
+  input:
+    income_tax_before_credits: 0
+  output:
+    savers_credit_credit_limit: 0

policyengine_us/tests/variables/household/demographic/geographic/tax_unit_state.yaml

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+- name: Tax unit state reflects household state
+  period: 2024
+  input:
+    state_code_str: CA
+  output:
+    tax_unit_state: CA
+
+- name: Tax unit state with different state
+  period: 2024
+  input:
+    state_code_str: NY
+  output:
+    tax_unit_state: NY

policyengine_us/tests/variables/household/emp_self_emp_ratio.yaml

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+- name: Employment income only returns ratio of 1
+  period: 2024
+  input:
+    employment_income: 50000
+    self_employment_income: 0
+  output:
+    emp_self_emp_ratio: 1.0
+
+- name: Self-employment income only returns ratio of 0
+  period: 2024
+  input:
+    employment_income: 0
+    self_employment_income: 50000
+  output:
+    emp_self_emp_ratio: 0.0
+
+- name: Equal employment and self-employment returns ratio of 0.5
+  period: 2024
+  input:
+    employment_income: 25000
+    self_employment_income: 25000
+  output:
+    emp_self_emp_ratio: 0.5
+
+- name: Zero earnings returns ratio of 1 (default)
+  period: 2024
+  input:
+    employment_income: 0
+    self_employment_income: 0
+  output:
+    emp_self_emp_ratio: 1.0