feat(storage): 新增应用更新目录并切换存储至 S3，新增应用管理日志模块

src/test/java/com/youlai/boot/app/update/component/ApkDeltaUpdaterTest.java

@@ -0,0 +1,102 @@
+package com.youlai.boot.app.update.component;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.security.MessageDigest;
+import java.security.SecureRandom;
+import java.util.Arrays;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * APK 增量差分工具测试。
+ * <p>
+ * 覆盖两点：当前平台能定位到内置的 {@code hdiffz}（且与 classpath 资源逐字节一致，
+ * 防止资源被过滤/损坏）；对高度相似的文件生成的补丁明显小于新包。
+ */
+@DisplayName("APK 增量差分工具测试")
+class ApkDeltaUpdaterTest {
+
+    private static final SecureRandom SECURE_RANDOM = new SecureRandom();
+    private static final int SIZE = 4 * 1024 * 1024;
+    private static final int CHANGED_OFFSET = 1024 * 1024;
+    private static final int CHANGED_LENGTH = 256 * 1024;
+
+    @Test
+    @DisplayName("当前平台应定位到可用的内置 hdiffz，且与资源逐字节一致")
+    void shouldPrepareBinaryForCurrentPlatform() throws IOException {
+        ApkDeltaUpdater.Platform platform = ApkDeltaUpdater.currentPlatform();
+        assertNotNull(platform);
+
+        Path hdiffz = ApkDeltaUpdater.binaryDir().resolve(platform.hdiffzName());
+        assertTrue(Files.isRegularFile(hdiffz), "hdiffz 不存在: " + hdiffz);
+        assertTrue(platform.isWindows() || Files.isExecutable(hdiffz), "hdiffz 不可执行: " + hdiffz);
+        assertEquals(sha256OfResource("/hdiffpatch/" + platform.folder() + "/" + platform.hdiffzName()),
+                sha256OfFile(hdiffz), "释放到工作目录的二进制与 classpath 资源不一致");
+    }
+
+    @Test
+    @DisplayName("相似文件应生成明显小于新包的补丁")
+    void shouldCreateCompactPatchForSimilarFiles(@TempDir Path dir)
+            throws IOException, InterruptedException {
+        byte[] oldBytes = randomBytes(SIZE);
+        byte[] newBytes = Arrays.copyOf(oldBytes, SIZE);
+        System.arraycopy(randomBytes(CHANGED_LENGTH), 0, newBytes, CHANGED_OFFSET, CHANGED_LENGTH);
+
+        File oldFile = dir.resolve("old.bin").toFile();
+        File newFile = dir.resolve("new.bin").toFile();
+        File patchFile = dir.resolve("delta.patch").toFile();
+        Files.write(oldFile.toPath(), oldBytes);
+        Files.write(newFile.toPath(), newBytes);
+
+        ApkDeltaUpdater.DeltaPlan plan = ApkDeltaUpdater.DeltaPlan.forFiles(oldFile, newFile);
+        assertEquals(ApkDeltaUpdater.SizeTier.SMALL, plan.tier(), "4MB 应落在 SMALL 档");
+
+        ApkDeltaUpdater.createPatch(oldFile, newFile, patchFile, plan);
+
+        long patchSize = patchFile.length();
+        assertTrue(patchSize > 0, "补丁为空");
+        // 仅改动 6.25% 内容，补丁应远小于新包（未改动部分由 hdiffz 以 copy 指令引用）
+        assertTrue(patchSize < newFile.length() / 4,
+                "补丁过大：" + patchSize + " / " + newFile.length());
+    }
+
+    private static byte[] randomBytes(int length) {
+        byte[] bytes = new byte[length];
+        SECURE_RANDOM.nextBytes(bytes);
+        return bytes;
+    }
+
+    private static String sha256OfResource(String resource) throws IOException {
+        try (InputStream in = ApkDeltaUpdater.class.getResourceAsStream(resource)) {
+            assertNotNull(in, "classpath 缺少内置二进制: " + resource);
+            return sha256(in.readAllBytes());
+        }
+    }
+
+    private static String sha256OfFile(Path file) throws IOException {
+        return sha256(Files.readAllBytes(file));
+    }
+
+    private static String sha256(byte[] bytes) {
+        try {
+            MessageDigest digest = MessageDigest.getInstance("SHA-256");
+            StringBuilder text = new StringBuilder();
+            for (byte b : digest.digest(bytes)) {
+                text.append(String.format("%02x", b));
+            }
+            return text.toString();
+        } catch (Exception e) {
+            throw new IllegalStateException(e);
+        }
+    }
+}