Optimize test case design

Write focused, efficient tests that validate core functionality without unnecessary complexity. Key principles: 1. Test one concept per case 2. Use appropriate test scope (unit vs integration)

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Write focused, efficient tests that validate core functionality without unnecessary complexity. Key principles:

  1. Test one concept per case
  2. Use appropriate test scope (unit vs integration)
  3. Leverage modern testing tools

Instead of exhaustive parameterized tests:

@ParameterizedTest
@ValueSource(ints = { -1, 0, 100 })
void testValues(int value) {
    // Testing simple pass-through logic
}

Prefer focused single test:

@Test
void testValue() {
    // Test with representative value
}

For JSON validation, use specialized assertions:

// Instead of string contains checks:
assertThat(entity.getBody()).contains("\"name\":\"test\"");

// Use structured assertions:
JsonContent body = new JsonContent(entity.getBody());
assertThat(body).extractingPath("name").isEqualTo("test");

When testing output, prefer CapturedOutput over complex mocks:

@Test
void testOutput(CapturedOutput output) {
    // Trigger output
    assertThat(output).contains("expected message");
}

Reserve integration tests for validating system interactions that cannot be effectively tested at the unit level.

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