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Validating Temperature Conversion Methods in AndroidUtilCode

This test suite validates temperature conversion utilities in the AndroidUtilCode library. It provides comprehensive testing of conversion methods between Celsius, Fahrenheit, and Kelvin scales with high precision delta checks. The suite ensures accurate temperature transformations across all common temperature scales.

Test Coverage Overview

The test suite covers six fundamental temperature conversion methods with precise validation:

Celsius to Fahrenheit and Kelvin conversions
Fahrenheit to Celsius and Kelvin conversions
Kelvin to Celsius and Fahrenheit conversions

Each test case validates conversion accuracy using a small delta value (1e-15f) to ensure high precision calculations.

Implementation Analysis

The testing approach utilizes JUnit4 framework with precise floating-point comparisons. Each conversion method is tested independently using Assert.assertEquals with a defined delta tolerance to handle floating-point arithmetic precision. The test structure follows a clear pattern of individual method validation with known temperature values at 0 degrees of each scale.

Technical Details

Testing infrastructure includes:

JUnit4 test runner annotation (@RunWith)
Individual @Test annotations for each conversion method
Delta value of 1e-15f for floating-point comparison precision
Assert.assertEquals for validation with delta parameter

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Single responsibility principle with individual test methods for each conversion
Consistent use of precision delta for floating-point comparisons
Clear test method naming that reflects the functionality being tested
Standard temperature reference points (0 degrees) for baseline testing

blankj/androidutilcode

lib/subutil/src/test/java/com/blankj/subutil/util/TemperatureUtilsTest.java

            
package com.blankj.subutil.util;


import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/**
 * <pre>
 *     author: Blankj
 *     blog  : http://blankj.com
 *     time  : 2018/03/22
 *     desc  : TemperatureUtils 单元测试
 * </pre>
 */
@RunWith(JUnit4.class)
public class TemperatureUtilsTest {

    private float delta = 1e-15f;

    @Test
    public void cToF() {
        Assert.assertEquals(32f, TemperatureUtils.cToF(0f), delta);
    }

    @Test
    public void cToK() {
        Assert.assertEquals(273.15f, TemperatureUtils.cToK(0f), delta);
    }


    @Test
    public void fToC() {
        Assert.assertEquals(-17.777779f, TemperatureUtils.fToC(0f), delta);
    }

    @Test
    public void fToK() {
        Assert.assertEquals(255.3722222222f, TemperatureUtils.fToK(0f), delta);
    }


    @Test
    public void kToC() {
        Assert.assertEquals(-273.15f, TemperatureUtils.kToC(0f), delta);
    }

    @Test
    public void kToF() {
        Assert.assertEquals(-459.67f, TemperatureUtils.kToF(0f), delta);
    }

}