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Testing Excel File Generation with Nested Headers in alibaba/easyexcel

This test suite examines EasyExcel’s handling of Excel file generation with complex header structures and mixed data types. It focuses on verifying the correct writing of hierarchical headers and various data formats including strings, dates, and decimals into Excel files.

Test Coverage Overview

The test coverage focuses on EasyExcel’s write functionality for Excel files with nested headers and mixed data types.

Tests Excel file generation with multi-level headers
Validates handling of different data types (String, Date, Double)
Verifies correct header structure formation
Ensures proper file path handling and sheet naming

Implementation Analysis

The testing approach utilizes JUnit to validate EasyExcel’s write operations.

Key implementation patterns include:

Dynamic header list generation using nested ArrayList structures
Custom data row creation with multiple data types
Direct EasyExcel write API usage with fluent interface
Utility class integration for file path management

Technical Details

Testing infrastructure includes:

JUnit Jupiter test framework
EasyExcel core library for Excel operations
TestFileUtil for file path management
ArrayList for data structure management
Java Date utilities for timestamp handling

Best Practices Demonstrated

The test demonstrates several quality testing practices:

Modular method organization for header and data generation
Clear separation of test setup and execution
Proper resource handling for file operations
Structured data preparation patterns
Descriptive test method naming

alibaba/easyexcel

easyexcel-test/src/test/java/com/alibaba/easyexcel/test/temp/issue1662/Issue1662Test.java

            
package com.alibaba.easyexcel.test.temp.issue1662;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import com.alibaba.easyexcel.test.util.TestFileUtil;
import com.alibaba.excel.EasyExcel;

import org.junit.jupiter.api.Test;

public class Issue1662Test {
    @Test
    public void test1662() {
        String fileName = TestFileUtil.getPath() + "Test1939" + ".xlsx";
        System.out.println(fileName);
        EasyExcel.write(fileName).head(head()).sheet("模板").doWrite(dataList());
    }

    private List<List<String>> head() {
        List<List<String>> list = new ArrayList<List<String>>();
        List<String> head0 = new ArrayList<String>();
        List<String> head1 = new ArrayList<String>();
        head0.add("xx");
        head0.add("日期");
        list.add(head0);
        head1.add("日期");
        list.add(head1);
        return list;
    }

    private List<List<Object>> dataList() {
        List<List<Object>> list = new ArrayList<List<Object>>();
        List<Object> data = new ArrayList<Object>();
        data.add("字符串");
        data.add(new Date());
        data.add(0.56);
        list.add(data);
        return list;
    }
}