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Testing Array Utility Operations and Primitive Conversions in Alibaba Arthas

This test suite evaluates the ArrayUtils class functionality in the Arthas core utilities, focusing on array manipulation and primitive type conversions. The tests verify empty array handling and Long to primitive long array conversion operations with various edge cases.

Test Coverage Overview

The test suite provides comprehensive coverage of ArrayUtils array manipulation methods.

Key areas tested include:

Empty long array validation
Null array handling
Long to primitive long array conversion
Edge cases with null elements

Integration points focus on core Java array operations and primitive type conversions.

Implementation Analysis

The testing approach utilizes JUnit 4 framework features for systematic validation of array utility functions.

Testing patterns include:

Direct array comparison using Assert.assertArrayEquals
Null input validation
Exception handling verification using @Rule ExpectedException

Framework-specific features leverage JUnit’s assertion methods and rule-based exception testing.

Technical Details

Testing tools and configuration:

JUnit 4 testing framework
ExpectedException rule for exception validation
Assert class for array comparison
Native Java array manipulation
Primitive and wrapper type handling

Best Practices Demonstrated

The test suite exemplifies robust testing practices through systematic validation of array operations.

Notable practices include:

Explicit null case handling
Edge case testing
Exception verification
Clear test method naming
Focused test scenarios

Code organization follows standard JUnit test structure with clear separation of test cases.

alibaba/arthas

core/src/test/java/com/taobao/arthas/core/util/ArrayUtilsTest.java

            
package com.taobao.arthas.core.util;

import org.junit.Assert;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;

/**
 * @author earayu
 */
public class ArrayUtilsTest {

    @Rule
    public ExpectedException thrown = ExpectedException.none();

    @Test
    public void testEmptyLongArray() {
        Assert.assertArrayEquals(ArrayUtils.EMPTY_LONG_ARRAY, new long[0]);
    }

    @Test
    public void testToPrimitive() {
        Assert.assertArrayEquals(ArrayUtils.toPrimitive(null), null);
        Assert.assertArrayEquals(ArrayUtils.toPrimitive(new Long[0]), new long[0]);
        Assert.assertArrayEquals(
                ArrayUtils.toPrimitive(new Long[]{
                        1L,
                        1763L,
                        54769975464L
                }),
                new long[]{
                        1L,
                        1763L,
                        54769975464L
                });
        //throws NullPointerException if array content is null
        thrown.expect(NullPointerException.class);
        Assert.assertArrayEquals(ArrayUtils.toPrimitive(new Long[]{null}), new long[]{1L});
    }
}