https://github.com/sandesh300/Rule-Engine-Application

Test Cases Documentation for RuleServiceTest

This document outlines the test cases covered in the RuleServiceTest class, which tests the RuleService for creating, modifying, combining, evaluating, and deleting rules, as well as handling exceptions. The service interacts with the RuleRepository to perform the operations.

1. Test Case: createRule_ValidRuleString_Success

• Purpose: Verify that a valid rule string creates a rule successfully.
• Test Steps:
  1. Prepare a valid rule string: "age > 30 AND department = 'Sales'".
  2. Call the createRule method.
  3. Verify that the rule is created, the root node is an operator, and that it is saved in the repository.
• Result:
  • Rule is created with a valid root node of type "operator" and value "AND".
  • Rule is saved successfully in the repository.

@Test
void createRule_ValidRuleString_Success() {
    String ruleString = "age > 30 AND department = 'Sales'";
    when(ruleRepository.save(any(Rule.class))).thenAnswer(i -> i.getArguments()[0]);

    Rule result = ruleService.createRule(ruleString, "Senior Sales Rule");

    assertNotNull(result);
    assertEquals("operator", result.getRootNode().getType());
    verify(ruleRepository).save(any(Rule.class));
}

2. Test Case: createRule_InvalidRuleString_ThrowsException

• Purpose: Validate that an invalid rule string throws a CustomException.
• Test Steps:
  1. Provide an invalid rule string: "age > 30 AND".
  2. Call the createRule method.
  3. Expect an exception to be thrown.
• Result:
  • A CustomException is thrown.

@Test
void createRule_InvalidRuleString_ThrowsException() {
    String invalidRuleString = "age > 30 AND";
    assertThrows(CustomException.class, () -> ruleService.createRule(invalidRuleString, "Invalid Rule"));
}

3. Test Case: createRule_UnbalancedParentheses_ThrowsException