Add compression and scanner tests; fix chunk_decompress data ownership bug, data_destroy NULL safety, chunk_compress memory leak

tests/test_scanner.c

@@ -0,0 +1,124 @@
+#include "test_utils.h"
+#include "scanner.h"
+#include "file.h"
+#include "utils.h"
+#include <string.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+static void create_test_file(const char *path, const char *content) {
+  to_disk(path, content, strlen(content));
+}
+
+static void test_scanner_single_file() {
+  const char *dir = "test_scan_dir_single";
+  const char *file1 = "test_scan_dir_single/file1.txt";
+  const char *content1 = "hello scanner";
+
+  mkdir(dir, 0755);
+  create_test_file(file1, content1);
+
+  DirectoryScanner *scanner = directory_scanner_create((char *)dir);
+  EXPECT_NOT_NULL(scanner);
+
+  Chunk *chunk = directory_scanner_next(scanner);
+  EXPECT_NOT_NULL(chunk);
+  EXPECT_EQ_INT(chunk->element_count, 1);
+  EXPECT_EQ_STR(chunk->items[0]->path, file1);
+
+  Chunk *next = directory_scanner_next(scanner);
+  EXPECT_NULL(next);
+
+  chunk_destroy(chunk);
+  directory_scanner_destroy(scanner);
+  unlink(file1);
+  rmdir(dir);
+}
+
+static void test_scanner_multiple_files() {
+  const char *dir = "test_scan_dir_multi";
+  const char *file1 = "test_scan_dir_multi/a.txt";
+  const char *file2 = "test_scan_dir_multi/b.txt";
+  const char *content1 = "alpha";
+  const char *content2 = "beta";
+
+  mkdir(dir, 0755);
+  create_test_file(file1, content1);
+  create_test_file(file2, content2);
+
+  DirectoryScanner *scanner = directory_scanner_create((char *)dir);
+  EXPECT_NOT_NULL(scanner);
+
+  Chunk *chunk = directory_scanner_next(scanner);
+  EXPECT_NOT_NULL(chunk);
+  EXPECT_EQ_INT(chunk->element_count, 2);
+
+  int found1 = 0, found2 = 0;
+  for (int i = 0; i < chunk->element_count; i++) {
+    if (strcmp(chunk->items[i]->path, file1) == 0) found1 = 1;
+    if (strcmp(chunk->items[i]->path, file2) == 0) found2 = 1;
+  }
+  EXPECT_TRUE(found1);
+  EXPECT_TRUE(found2);
+
+  Chunk *next = directory_scanner_next(scanner);
+  EXPECT_NULL(next);
+
+  chunk_destroy(chunk);
+  directory_scanner_destroy(scanner);
+  unlink(file1);
+  unlink(file2);
+  rmdir(dir);
+}
+
+static void test_scanner_subdirectory() {
+  const char *root = "test_scan_sub";
+  const char *sub = "test_scan_sub/sub";
+  const char *root_file = "test_scan_sub/root.txt";
+  const char *sub_file = "test_scan_sub/sub/sub_file.txt";
+  const char *content = "nested content";
+
+  mkdir(root, 0755);
+  mkdir(sub, 0755);
+  create_test_file(root_file, content);
+  create_test_file(sub_file, content);
+
+  DirectoryScanner *scanner = directory_scanner_create((char *)root);
+  EXPECT_NOT_NULL(scanner);
+
+  int total_files = 0;
+  Chunk *chunk;
+  while ((chunk = directory_scanner_next(scanner)) != NULL) {
+    total_files += chunk->element_count;
+    chunk_destroy(chunk);
+  }
+  EXPECT_EQ_INT(total_files, 2);
+
+  directory_scanner_destroy(scanner);
+  unlink(root_file);
+  unlink(sub_file);
+  rmdir(sub);
+  rmdir(root);
+}
+
+static void test_scanner_empty_directory() {
+  const char *dir = "test_scan_empty";
+
+  mkdir(dir, 0755);
+
+  DirectoryScanner *scanner = directory_scanner_create((char *)dir);
+  EXPECT_NOT_NULL(scanner);
+
+  Chunk *chunk = directory_scanner_next(scanner);
+  EXPECT_NULL(chunk);
+
+  directory_scanner_destroy(scanner);
+  rmdir(dir);
+}
+
+void test_scanner() {
+  test_scanner_single_file();
+  test_scanner_multiple_files();
+  test_scanner_subdirectory();
+  test_scanner_empty_directory();
+}