Fix comparer and add its unit tests #2
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WalkthroughThe pull request introduces JUnit 5 dependencies in the Changes
Sequence Diagram(s)sequenceDiagram
participant Client
participant Comparer
Client->>Comparer: compare(a, b)
alt Either a or b is null
Comparer-->>Client: Throw NullPointerException
else Valid inputs provided
Comparer->>Comparer: Validate types and values
alt Numeric Comparison
Comparer-->>Client: Return 1 if a > b, 0 if a == b, -1 if a < b
else Lexicographical Comparison
Comparer-->>Client: Return string-based comparison or throw IllegalArgumentException on mismatch
end
end
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Actionable comments posted: 0
🧹 Nitpick comments (2)
src/test/java/org/alda/common/ComparerTest.java (2)
18-24: Remove debug print statementThere's a debug print statement in the numeric comparison test that should be removed.
- System.out.println(Comparer.compare(100, 100));
46-57: Null value tests should verify exception messagesWhile the null value tests correctly verify that NullPointerExceptions are thrown, they don't validate the exception messages. Consider adding message validation similar to the invalid type tests.
Exception exception1 = assertThrows(NullPointerException.class, () -> Comparer.compare(null, "banana") ); + assertEquals("Both arguments must be either Strings or Numbers.", exception1.getMessage()); Exception exception2 = assertThrows(NullPointerException.class, () -> Comparer.compare(42, null) ); + assertEquals("Both arguments must be either Strings or Numbers.", exception2.getMessage()); Exception exception3 = assertThrows(NullPointerException.class, () -> Comparer.compare(null, null) ); + assertEquals("Both arguments must be either Strings or Numbers.", exception3.getMessage());
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📒 Files selected for processing (3)
pom.xml(1 hunks)src/main/java/org/alda/common/Comparer.java(1 hunks)src/test/java/org/alda/common/ComparerTest.java(1 hunks)
🔇 Additional comments (6)
pom.xml (1)
17-30: Dependencies added for JUnit 5 testingThe addition of JUnit 5 dependencies is appropriate for enabling unit testing in the project. Both the API and the engine are included with the correct test scope.
src/main/java/org/alda/common/Comparer.java (2)
53-53: Logic change from>=to>modifies equality handlingThe comparison logic has been changed from
>=to>. This change affects how equality is determined in numeric comparisons. The logic flow still works correctly as equality is handled in the finalreturn 0statement, but it's important to note this behavioral change.
60-63: Added null check improves error handlingThe addition of null checks before the IllegalArgumentException is a good improvement. It provides a more specific exception when null values are encountered and makes the error handling more explicit.
src/test/java/org/alda/common/ComparerTest.java (3)
11-16: Well-structured string comparison testsThe string comparison tests are well-structured and cover the three important cases: less than, greater than, and equality comparisons. This provides good test coverage for the lexicographical comparison functionality.
26-31: Good test coverage for mixed number typesThe mixed number type tests appropriately verify that the Comparer can handle different numeric types correctly, testing both integer-to-float and float-to-integer comparison scenarios.
33-44: Invalid type tests verify exception behaviorThese tests verify that the proper exception is thrown with the correct message when attempting to compare incompatible types. Both String-to-Number and Number-to-String cases are covered.
Summary by CodeRabbit
Bug Fixes
Tests