szip: add support for unpacking zip archives and simple zip files

vlib/szip/szip_test.v

@@ -2,12 +2,36 @@ import szip
 import os
 
 fn test_szip() {
-	mut z := szip.open('test_compile.zip', .best_speed, .write) or {
-		assert false
-		return
+
+// create temp files for zip/unzip test
+	test_path := 'zip files'
+	test_out_zip := 'v_test_zip.zip'
+	
+	os.mkdir(test_path) or { panic(err) }
+	os.write_file(test_path + os.path_separator + 'file_1.txt', 'file one') or { panic(err) }
+	os.write_file(test_path + os.path_separator + 'file_2.txt', 'file file two') or { panic(err) }
+
+	// get list files from directory
+	mut files := os.ls(test_path) or { panic(err) }
+	for mut file in files {
+		file = os.getwd() + os.path_separator + test_path + os.path_separator + *file
 	}
-	defer {
-		z.close()
-		os.rm('test_compile.zip') or { }
-	}
-}
+
+// zip files
+	szip.zip_files(files, test_out_zip) or { panic(err) }
+	assert os.exists(test_out_zip)
+
+// remove files before next test
+	os.rm(test_path + os.path_separator + 'file_1.txt') or { panic(err) }
+	os.rm(test_path + os.path_separator + 'file_2.txt') or { panic(err) }
+
+// extract test
+	szip.extract_zip_to_dir(test_out_zip, test_path) or { panic(err) }
+	assert os.exists(test_path + os.path_separator + 'file_1.txt')
+	assert os.exists(test_path + os.path_separator + 'file_2.txt')
+
+// clear temp files
+	// remove temp files and dir
+	os.rmdir_all (test_path) or { panic(err) }
+	os.rm(test_out_zip) or { }
+}