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Testing DateTime Formatting Utilities in Alibaba Arthas

This test suite validates the DateUtils class functionality in Arthas, focusing on datetime formatting operations. The tests verify both valid and invalid date format patterns to ensure robust date handling capabilities.

Test Coverage Overview

The test suite provides targeted coverage of the DateUtils class’s datetime formatting capabilities.

Key areas tested include:

Correct date format pattern validation
Handling of unsupported date formats
Comparison of formatted outputs with expected patterns

The tests specifically verify the default format ‘yyyy-MM-dd HH:mm:ss.SSS’ against alternative patterns.

Implementation Analysis

The testing approach employs JUnit 4 framework with precise assertions to validate datetime formatting logic.

Implementation features:

Use of LocalDateTime for current timestamp generation
DateTimeFormatter for pattern-based formatting
Direct comparison testing using assertEquals and assertNotEquals

Technical Details

Testing infrastructure includes:

JUnit 4 testing framework
Java 8 Time API (LocalDateTime, DateTimeFormatter)
Assert methods for validation
Custom DateUtils implementation

Best Practices Demonstrated

The test suite exemplifies several testing best practices for date handling utilities.

Notable practices include:

Separate test methods for positive and negative scenarios
Clear test method naming conventions
Explicit format pattern testing
Runtime comparison of formatted outputs

alibaba/arthas

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

            
package com.taobao.arthas.core.util;

import org.junit.Assert;
import org.junit.Test;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

/**
 *
 * @author brijeshprasad89
 *
 */
public class DateUtilsTest {

    @Test
    public void testFormatDateTimeWithCorrectFormat() {
        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.SSS"); // supported date format
        LocalDateTime dateTime = LocalDateTime.now();
        Assert.assertEquals(DateUtils.formatDateTime(dateTime), dateTimeFormatter.format(dateTime));
    }

    @Test
    public void testFormatDateTimeWithInCorrectFormat() {
        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm"); // Not supported Date format
        LocalDateTime dateTime = LocalDateTime.now();
        Assert.assertNotEquals(DateUtils.formatDateTime(dateTime), dateTimeFormatter.format(dateTime));
    }

}