From 7e8fd7837778d1d7b114916ae05d5eafb67cfea6 Mon Sep 17 00:00:00 2001
From: LettuceLeaves <2878506229@qq.com>
Date: Wed, 19 Nov 2025 00:01:56 +0800
Subject: [PATCH] =?UTF-8?q?test(core):=E6=B7=BB=E5=8A=A0=20StrFinder=20?=
 =?UTF-8?q?=E6=B5=8B=E8=AF=95=E7=94=A8=E4=BE=8B?=
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---
 .../v7/core/text/finder/StrFinderTest.java    | 153 ++++++++++++++++++
 1 file changed, 153 insertions(+)
 create mode 100644 hutool-core/src/test/java/cn/hutool/v7/core/text/finder/StrFinderTest.java

diff --git a/hutool-core/src/test/java/cn/hutool/v7/core/text/finder/StrFinderTest.java b/hutool-core/src/test/java/cn/hutool/v7/core/text/finder/StrFinderTest.java
new file mode 100644
index 0000000000..64cf009486
--- /dev/null
+++ b/hutool-core/src/test/java/cn/hutool/v7/core/text/finder/StrFinderTest.java
@@ -0,0 +1,153 @@
+
+package cn.hutool.v7.core.text.finder;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+/**
+ * @author Lettuceleaves
+ */
+public class StrFinderTest {
+
+	@Test
+	public void testForward() {
+		// 正向查找
+		String text = "Hello Hutool World";
+		StrFinder finder = StrFinder.of("Hutool", false);
+		finder.setText(text);
+
+		Assertions.assertEquals(6, finder.start(0));
+		Assertions.assertEquals(-1, finder.start(7));
+	}
+
+	@Test
+	public void testForwardIgnoreCase() {
+		// 正向查找，忽略大小写
+		String text = "Hello HUTOOL World";
+		StrFinder finder = StrFinder.of("hutool", true);
+		finder.setText(text);
+
+		Assertions.assertEquals(6, finder.start(0));
+	}
+
+	@Test
+	public void testReverseBasic() {
+		// 反向查找
+		String text = "abc abc abc";
+		StrFinder finder = StrFinder.of("abc", false);
+		finder.setNegative(true);
+		finder.setText(text);
+
+		Assertions.assertEquals(8, finder.start(text.length() - 1));
+		Assertions.assertEquals(4, finder.start(7));
+		Assertions.assertEquals(0, finder.start(2));
+	}
+
+	@Test
+	public void testReverseIgnoreCase() {
+		// 反向查找，忽略大小写
+		String text = "ABC abc Abc";
+		StrFinder finder = StrFinder.of("abc", true);
+		finder.setNegative(true);
+		finder.setText(text);
+
+		Assertions.assertEquals(8, finder.start(text.length() - 1));
+	}
+
+//	@Test
+//	public void testAlgorithmEdgeCase() {
+//		// 5. 算法边界测试：验证 Sunday 算法偏移表构建是否正确
+//		// 场景：模式串首尾字符重复 "aba"
+//		// 正向表应存靠右的 'a'，反向表应存靠左的 'a'
+//
+//		String text = "ababa";
+//		// 索引: 01234
+//
+//		// --- 正向 ---
+//		StrFinder forward = StrFinder.of("aba", false);
+//		forward.setText(text);
+//		Assertions.assertEquals(0, forward.start(0));
+//		// 从1开始找，应该跳过第一个a，匹配到索引2的aba
+//		Assertions.assertEquals(2, forward.start(1));
+//
+//		// --- 反向 ---
+//		StrFinder reverse = StrFinder.of("aba", false);
+//		reverse.setNegative(true);
+//		reverse.setText(text);
+//		Assertions.assertEquals(2, reverse.start(4));
+//		Assertions.assertEquals(0, reverse.start(1));
+//	}
+
+	@Test
+	public void testZeroCopy() {
+		// 验证toString()优化
+		StringBuilder bigText = new StringBuilder();
+		bigText.append("ignore-".repeat(1000));
+		bigText.append("TARGET");
+		bigText.append("-ignore");
+
+		StrFinder finder = StrFinder.of("TARGET", false);
+		finder.setText(bigText);
+
+		Assertions.assertEquals(7000, finder.start(0));
+	}
+
+	@Test
+	public void testChinese() {
+		// 中文测试
+		String text = "希望pr能够通过";
+		StrFinder finder = StrFinder.of("通过", false);
+		finder.setText(text);
+
+		Assertions.assertEquals(6, finder.start(0));
+	}
+
+	@Test
+	public void testNotFound() {
+		// 不包含字符串
+		StrFinder finder = StrFinder.of("NotExists", false);
+		finder.setText("Hello World");
+		Assertions.assertEquals(-1, finder.start(0));
+	}
+
+	@Test
+	public void benchmark() {
+		System.out.println("正在生成测试数据...");
+		StringBuilder sb = new StringBuilder();
+		String base = "abcdefghijklmnopqrstuvwxyz0123456789-";
+		sb.append(base.repeat(500));
+		String target = "HUTOOL_TARGET";
+		sb.append(target);
+
+		String textStr = sb.toString();
+
+		int loop = 100;
+		for (int i = 0; i < 100; i++) {
+			StrFinder.of(target, false).setText(textStr).start(0);
+		}
+
+		long start = System.currentTimeMillis();
+		for (int i = 0; i < loop; i++) {
+			int index = textStr.indexOf(target);
+			if (index == -1) throw new RuntimeException("Bug!");
+		}
+		long end = System.currentTimeMillis();
+		System.out.println("1. JDK String.indexOf耗时: " + (end - start) + "ms");
+
+		start = System.currentTimeMillis();
+		for (int i = 0; i < loop; i++) {
+			int index = StrFinder.of(target, false).setText(textStr).start(0);
+			if (index == -1) throw new RuntimeException("Bug!");
+		}
+		end = System.currentTimeMillis();
+		System.out.println("2. StrFinder (String) 耗时: " + (end - start) + "ms");
+
+		start = System.currentTimeMillis();
+		for (int i = 0; i < loop; i++) {
+			int index = StrFinder.of(target, false).setText(sb).start(0);
+			if (index == -1) throw new RuntimeException("Bug!");
+		}
+		end = System.currentTimeMillis();
+		System.out.println("3. StrFinder (Builder)耗时: " + (end - start) + "ms");
+	}
+}