test: 增加图例highligh模式单测

[tangying1027]

Checklist

• npm test passes
• tests and/or benchmarks are included
• commit message follows commit guidelines

Description of change

[gemini-code-assist]

Summary of Changes

Hello @tangying1027, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

此拉取请求主要引入了一个新的测试用例，旨在验证图例（legend）的 highlight 模式在用户点击交互时的正确行为。同时，对核心图表逻辑中的高亮样式获取方法进行了微小的代码结构优化，以提高代码可读性。整体目标是增强图表组件的健壮性和测试覆盖率。

Highlights

• 测试用例新增: 为图例的 highlight 模式添加了一个新的测试用例，通过模拟点击操作并进行图像快照比对，确保其交互行为符合预期。
• 代码重构: 在 packages/f2/src/chart/index.tsx 文件中，将 isHighLight 变量的声明位置进行了微调，优化了 getHighlightStyle 方法中的代码结构。

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[gemini-code-assist]

Code Review

此 PR 增加了一个单元测试，用于验证图例（Legend）的 highlight 模式。代码改动主要包括：

1. 在 chart/index.tsx 中对 getHighlightStyle 方法进行了一处微小的代码移动。
2. 在 legend/interval.test.tsx 中添加了新的测试用例。

我的评审意见主要集中在代码质量和可维护性上：

• 建议重构 getHighlightStyle 方法，以提高其可读性和简洁性。
• 建议重构新的测试用例，通过提取辅助函数来减少重复代码。
• 发现并指出了一个未使用的变量。

总体而言，这是一个有价值的补充，增加了测试覆盖率。通过采纳建议的重构，代码质量可以得到进一步提升。

[github-actions]

Critical size changes

Includes critical production bundles, as well as any change greater than 2%:

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
f2/dist/index.js	=	1,706.45 kB	1,706.45 kB	=	323.03 kB	323.03 kB
f2/dist/index.min.js	=	532.96 kB	532.96 kB	=	160.22 kB	160.22 kB

Significant size changes

Includes any change greater than 0.2%:
(No significant changes)

Generated by 🚫 dangerJS against 0eb18e1