Fix config loading, speed thresholds and block selection; add tests, README, CLAUDE.md

.gitignore

@@ -3,3 +3,8 @@
 /other/
 /.venv/
 /.idea/
+
+# added by git-init
+__pycache__/
+*.py[cod]
+/build/

CLAUDE.md

@@ -0,0 +1,32 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Commands
+
+```bash
+python3 -m venv .venv && .venv/bin/pip install -r requirements.txt   # pygame
+.venv/bin/python das_tetris_gui.py                                    # run the game
+.venv/bin/python -m unittest discover -s tests -v                     # all tests (headless, SDL dummy driver)
+.venv/bin/python -m unittest tests.test_game.TetrisGameTest.test_clear_lines_scoring   # single test
+.venv/bin/pyinstaller das_tetris_gui.spec    # build executable into dist/ (local spec, git-ignored; equivalent: pyinstaller --onefile das_tetris_gui.py)
+```
+
+Smoke-run headless: `SDL_VIDEODRIVER=dummy timeout -s KILL 5 .venv/bin/python das_tetris_gui.py`. Use SIGKILL: SDL turns SIGTERM into `pygame.QUIT`, which opens the "exit?" dialog and waits forever.
+
+## Architecture
+
+- `das_tetris_gui.py` – entry point. `TetrisGame` (field, falling piece, scoring, speed, input), `TetrisRenderer` (pygame drawing), `show_question_dialogue` (modal Yes/No loop that runs its own event loop), `main()` loop at 60 FPS.
+- `tetris_config.py` – `load_config()` overwrites module-level globals (`KEY_CONFIG`, `COLORS`, `BLOCK_TYPE`, `STORE_WIDTH`, `BLOCK_SIZE`, `HIGH_SCORE_INC_SPEED`, …). The game module calls it **at import time** and copies most globals into its own names, but reads `cfg.HIGH_SCORE_INC_SPEED` live. The hard-coded `BlockType` enum in this file is only the source for `store_config()`; at runtime `BLOCK_TYPE` is rebuilt dynamically from JSON.
+- `Serializer.py` – `EnumSerializer`: JSON ⇄ Python with `__type__` tags (`PygameKey` stored by name, `tuple`/`list`/`set`, `EnumClass`, `EnumInstance`). Used for `config.json`; block files are read with plain `json`.
+
+### Config files (`configs/`)
+- `config.json`, `blocks.json`, `blocks_ADD.json` – local/working configs. If one is missing, `<name>_000.json` (committed defaults) is used. Paths are resolved next to the script, or next to the executable when frozen.
+- Blocks from `blocks.json` (`ALL_BLOCKS.members`) and `blocks_ADD.json` (`ADDITIONAL_BLOCKS.members`, optional) are merged; a later key overrides an earlier one. Each block: `name`, `color` `[r,g,b]`, `min_score` (block appears only once score reaches it; at least one must be 0), `shapes` – list of rotations (clockwise), each a 0/1 matrix drawn from the top-left.
+- Field cells store `index in list(BLOCK_TYPE) + 1`, so block order matters for rendering. Blocks with identical values become Enum aliases and disappear from `list(BLOCK_TYPE)`.
+- `high_score_inc_speed` (optional, default false): `fall_speed` is the drop interval in seconds, so `true` makes the game **slower** above 5000/10000/15000 points, `false` makes it faster.
+- `tetris_config.store_config()` overwrites `config.json`/`blocks.json` from the hard-coded values – do not call it casually.
+
+### Misc
+- `other/` (git-ignored) holds early prototypes and translations of other Tetris implementations; not used by the game.
+- PyInstaller spec bundles no data files: the built executable needs a `configs/` folder beside it.

README.md

@@ -0,0 +1,69 @@
+## -=:dAs:=- Tetris
+### _Classic Tetris on Python + pygame with configurable blocks, colors and controls_
+
+[![Python](https://img.shields.io/badge/Python-3.12-green)](#) [![pygame](https://img.shields.io/badge/pygame-2.6.1-orange)](#) [![PyInstaller](https://img.shields.io/badge/PyInstaller-6.16-blue)](#)
+
+🇺🇦 [Українська версія](README_ua.md)
+
+### 💡 Purpose
+A desktop Tetris game where the set of pieces, their colors, the unlock score for each piece, the field width, block size, colors and keys are described in JSON files – so the game can be extended with new shapes without touching the code.
+
+### 📃 Features
+- [Gameplay](#Gameplay) – falling pieces, rotation, line clearing, score and lines counter, next-piece preview
+- [Progressive pieces](#ProgressivePieces) – 23 shapes, new ones unlock as the score grows
+- [Configuration](#Configuration) – keys, colors, field width, block size and speed mode in JSON
+- Pause, restart and exit confirmation dialog (mouse or Y/N keys)
+
+### ⭐ Advantages
+- **Data-driven shapes** – any new piece is a few lines of JSON: name, color, minimal score and a list of rotations.
+- **Safe defaults** – committed `*_000.json` defaults are used automatically when local configs are absent.
+- **Runs from anywhere** – configs are resolved next to the script or the built executable, not the current directory.
+- **Clear config errors** – broken JSON or a missing key stops the game with a message naming the file and key.
+
+### 📱 Screenshots
+<table>
+  <tr>
+    <td align="center"><img src="images/screenshot_game.png" width="300" alt="Game" /></td>
+    <td align="center"><img src="images/logo_02_256x256.png" width="200" alt="Logo" /></td>
+  </tr>
+  <tr>
+    <td align="center"><i>Game field</i></td>
+    <td align="center"><i>Logo</i></td>
+  </tr>
+</table>
+
+### 📌 Using
+
+#### Gameplay<a id='Gameplay' />
+**_Standard Tetris rules on a 20-row field_**
+- `←` / `→` – move, `↑` – rotate, `↓` – drop one row
+- `P` – pause, `R` – restart, `Esc` – exit (with confirmation)
+- Score for cleared lines at once: 1 – 100, 2 – 300, 3 – 500, 4 – 800
+- The next piece is always different from the current one
+
+#### Progressive pieces<a id='ProgressivePieces' />
+**_The higher the score, the more varied the pieces_**
+- 8 base shapes (`configs/blocks.json`): Square, Line, Line3 and L from the start; J from 900, S from 1000, Z and T from 2500 points
+- 15 additional shapes (`configs/blocks_ADD.json`, optional): Dot, U, Corner, X, P, F and others, unlocked from 3500 up to 30000 points
+- Above 5000, 10000 and 15000 points the falling speed changes
+
+#### Configuration<a id='Configuration' />
+**_All settings live in `configs/`_**
+- `config.json` – keys (pygame key names, e.g. `K_LEFT`), controls help text, colors, `store_width` (field width in blocks), `block_size` (pixels), `high_score_inc_speed`
+- `high_score_inc_speed`: `false` – the game speeds up as the score grows, `true` – it slows down
+- `blocks.json` / `blocks_ADD.json` – pieces: `name`, `color` `[r, g, b]`, `min_score`, `shapes` (list of clockwise rotations, 0/1 matrices); at least one piece must have `min_score` 0
+- If a local file is missing, its `*_000.json` default is used
+
+### 🚀 Running
+Requirements: Python 3.12, pygame 2.6.
+```shell
+python3 -m venv .venv
+.venv/bin/pip install -r requirements.txt
+.venv/bin/python das_tetris_gui.py                  # start the game
+.venv/bin/python -m unittest discover -s tests -v   # run tests
+.venv/bin/pip install pyinstaller
+.venv/bin/pyinstaller --onefile das_tetris_gui.py   # build a single executable into dist/
+```
+The executable reads configs from a `configs/` folder located next to it.
+
+###### _Made by -=:dAs:=-_

README_ua.md

@@ -0,0 +1,69 @@
+## -=:dAs:=- Tetris
+### _Класичний тетріс на Python + pygame з налаштовуваними фігурами, кольорами та керуванням_
+
+[![Python](https://img.shields.io/badge/Python-3.12-green)](#) [![pygame](https://img.shields.io/badge/pygame-2.6.1-orange)](#) [![PyInstaller](https://img.shields.io/badge/PyInstaller-6.16-blue)](#)
+
+🇬🇧 [English version](README.md)
+
+### 💡 Призначення
+Десктопна гра тетріс, у якій набір фігур, їхні кольори, рахунок для появи кожної фігури, ширина поля, розмір блока, кольори та клавіші описані у JSON-файлах – тож гру можна розширювати новими фігурами, не змінюючи код.
+
+### 📃 Можливості
+- [Ігровий процес](#Gameplay) – падіння фігур, обертання, очищення ліній, рахунок і лічильник ліній, попередній перегляд наступної фігури
+- [Прогресивні фігури](#ProgressivePieces) – 23 фігури, нові відкриваються зі зростанням рахунку
+- [Налаштування](#Configuration) – клавіші, кольори, ширина поля, розмір блока та режим швидкості в JSON
+- Пауза, перезапуск і діалог підтвердження виходу (мишею або клавішами Y/N)
+
+### ⭐ Переваги
+- **Фігури як дані** – нова фігура – це кілька рядків JSON: назва, колір, мінімальний рахунок і список поворотів.
+- **Безпечні значення за замовчуванням** – якщо локальних конфігів немає, автоматично використовуються закомічені `*_000.json`.
+- **Запуск з будь-якої теки** – конфіги шукаються поруч зі скриптом або зібраним виконуваним файлом, а не в поточній теці.
+- **Зрозумілі помилки конфігурації** – зламаний JSON чи відсутній ключ зупиняють гру з повідомленням, де названо файл і ключ.
+
+### 📱 Скріншоти
+<table>
+  <tr>
+    <td align="center"><img src="images/screenshot_game.png" width="300" alt="Гра" /></td>
+    <td align="center"><img src="images/logo_02_256x256.png" width="200" alt="Логотип" /></td>
+  </tr>
+  <tr>
+    <td align="center"><i>Ігрове поле</i></td>
+    <td align="center"><i>Логотип</i></td>
+  </tr>
+</table>
+
+### 📌 Використання
+
+#### Ігровий процес<a id='Gameplay' />
+**_Стандартні правила тетрісу на полі висотою 20 рядків_**
+- `←` / `→` – рух, `↑` – поворот, `↓` – опустити на рядок
+- `P` – пауза, `R` – перезапуск, `Esc` – вихід (з підтвердженням)
+- Очки за одночасно очищені лінії: 1 – 100, 2 – 300, 3 – 500, 4 – 800
+- Наступна фігура завжди відрізняється від поточної
+
+#### Прогресивні фігури<a id='ProgressivePieces' />
+**_Що вищий рахунок, то різноманітніші фігури_**
+- 8 базових фігур (`configs/blocks.json`): квадрат, лінія, лінія-3 та L – одразу; J – з 900, S – з 1000, Z і T – з 2500 очок
+- 15 додаткових фігур (`configs/blocks_ADD.json`, необов'язковий): точка, U, кут, X, P, F та інші – від 3500 до 30000 очок
+- Після 5000, 10000 і 15000 очок змінюється швидкість падіння
+
+#### Налаштування<a id='Configuration' />
+**_Усі налаштування – в теці `configs/`_**
+- `config.json` – клавіші (назви клавіш pygame, напр. `K_LEFT`), текст підказки з керуванням, кольори, `store_width` (ширина поля в блоках), `block_size` (пікселі), `high_score_inc_speed`
+- `high_score_inc_speed`: `false` – гра пришвидшується зі зростанням рахунку, `true` – сповільнюється
+- `blocks.json` / `blocks_ADD.json` – фігури: `name`, `color` `[r, g, b]`, `min_score`, `shapes` (список поворотів за годинниковою стрілкою, матриці з 0/1); хоча б одна фігура повинна мати `min_score` 0
+- Якщо локального файлу немає, використовується відповідний `*_000.json`
+
+### 🚀 Запуск
+Вимоги: Python 3.12, pygame 2.6.
+```shell
+python3 -m venv .venv
+.venv/bin/pip install -r requirements.txt
+.venv/bin/python das_tetris_gui.py                  # запустити гру
+.venv/bin/python -m unittest discover -s tests -v   # запустити тести
+.venv/bin/pip install pyinstaller
+.venv/bin/pyinstaller --onefile das_tetris_gui.py   # зібрати єдиний виконуваний файл у dist/
+```
+Виконуваний файл читає конфіги з теки `configs/`, розташованої поруч із ним.
+
+###### _Made by -=:dAs:=-_

configs/blocks.json

@@ -0,0 +1,85 @@
+{
+  "ALL_BLOCKS": {
+    "__type__": "EnumClass",
+    "name": "BlockType",
+    "members": {
+      "O": {
+        "name": "Square",
+        "color": [255,255,0],
+        "min_score": 0,
+        "shapes": [
+          [[1,1],[1,1]]
+        ]
+      },
+      "I": {
+        "name": "Line",
+        "color": [0,255,255],
+        "min_score": 0,
+        "shapes": [
+          [[1,1,1,1]],
+          [[1],[1],[1],[1]]
+        ]
+      },
+      "I3": {
+        "name": "Line3",
+        "color": [55,180,210],
+        "min_score": 0,
+        "shapes": [
+          [[1,1,1]],
+          [[1],[1],[1]]
+        ]
+      },
+      "L": {
+        "name": "L-Shape",
+        "color": [255,0,255],
+        "min_score": 0,
+        "shapes": [
+            [[1, 0], [1, 0], [1, 1]],
+            [[1, 1, 1], [1, 0, 0]],
+            [[1, 1], [0, 1], [0, 1]],
+            [[0, 0, 1], [1, 1, 1]]
+        ]
+      },
+      "J": {
+        "name": "J-Shape",
+        "color": [0,0,255],
+        "min_score": 900,
+        "shapes": [
+            [[0, 1], [0, 1], [1, 1]],
+            [[1, 0, 0], [1, 1, 1]],
+            [[1, 1], [1, 0], [1, 0]],
+            [[1, 1, 1], [0, 0, 1]]
+        ]
+      },
+      "S": {
+        "name": "S-Shape",
+        "color": [0,255,0],
+        "min_score": 1000,
+        "shapes": [
+            [[0, 1, 1], [1, 1, 0]],
+            [[1, 0], [1, 1], [0, 1]]
+        ]
+      },
+      "Z": {
+        "name": "Z-Shape",
+        "color": [255,0,0],
+        "min_score": 2500,
+        "shapes": [
+            [[1, 1, 0], [0, 1, 1]],
+            [[0, 1], [1, 1], [1, 0]]
+        ]
+      },
+      "T": {
+        "name": "T-Shape",
+        "color": [255,255,255],
+        "min_score": 2500,
+        "shapes": [
+            [[1, 1, 1], [0, 1, 0]],
+            [[1, 0], [1, 1], [1, 0]],
+            [[0, 1, 0], [1, 1, 1]],
+            [[0, 1], [1, 1], [0, 1]]
+        ]
+      }
+    }
+  }
+}

configs/blocks_ADD.json

@@ -0,0 +1,163 @@
+{
+  "ADDITIONAL_BLOCKS": {
+    "__type__": "EnumClass",
+    "name": "BlockType",
+    "members": {
+      "D": {
+        "name": "Dot",
+        "color": [255, 255, 100],
+        "min_score": 3500,
+        "shapes": [
+          [[1]]
+        ]
+      },
+      "U": {
+        "name": "U-Shape",
+        "color": [135, 135, 135],
+        "min_score": 4500,
+        "shapes": [
+            [[1, 0, 1], [1, 1, 1]],
+            [[1, 1], [1, 0], [1, 1]],
+            [[1, 1, 1], [1, 0, 1]],
+            [[1, 1], [0, 1], [1, 1]]
+        ]
+      },
+      "T1": {
+        "name": "T-Shape+",
+        "color": [0, 200, 255],
+        "min_score": 10000,
+        "shapes": [
+          [[1, 1, 1], [0, 1, 0], [0, 1, 0]],
+          [[0, 0, 1], [1, 1, 1], [0, 0, 1]],
+          [[0, 1, 0], [0, 1, 0], [1, 1, 1]],
+          [[1, 0, 0], [1, 1, 1], [1, 0, 0]]
+        ]
+      },
+      "U1": {
+        "name": "U-Shape+",
+        "color": [255, 150, 0],
+        "min_score": 10000,
+        "shapes": [
+          [[1, 1, 1], [1, 0, 1], [1, 0, 1]],
+          [[1, 1, 1], [1, 0, 0], [1, 1, 1]],
+          [[1, 0, 1], [1, 0, 1], [1, 1, 1]],
+          [[1, 1, 1], [0, 0, 1], [1, 1, 1]]
+        ]
+      },
+      "X": {
+        "name": "X-Shape",
+        "color": [50, 150, 100],
+        "min_score": 15000,
+        "shapes": [
+          [[0, 1, 0], [1, 1, 1], [0, 1, 0]]
+        ]
+      },
+      "Cn": {
+        "name": "Corner",
+        "color": [15, 180, 180],
+        "min_score": 5000,
+        "shapes": [
+          [[1, 0], [1, 1]],
+          [[1, 1], [1, 0]],
+          [[1, 1], [0, 1]],
+          [[0, 1], [1, 1]]
+        ]
+      },
+      "CN": {
+        "name": "Corner+",
+        "color": [15, 15, 180],
+        "min_score": 4000,
+        "shapes": [
+          [[1, 0, 0], [1, 0, 0], [1, 1, 1]],
+          [[1, 1, 1], [1, 0, 0], [1, 0, 0]],
+          [[1, 1, 1], [0, 0, 1], [0, 0, 1]],
+          [[0, 0, 1], [0, 0, 1], [1, 1, 1]]
+        ]
+      },
+      "W": {
+        "name": "Dabl",
+        "color": [180, 25, 230],
+        "min_score": 15000,
+        "shapes": [
+          [[1, 0, 0], [1, 1, 0], [0, 1, 1]],
+          [[0, 1, 1], [1, 1, 0], [1, 0, 0]],
+          [[1, 1, 0], [0, 1, 1], [0, 0, 1]],
+          [[0, 0, 1], [0, 1, 1], [1, 1, 0]]
+        ]
+      },
+      "Z1": {
+        "name": "Zet",
+        "color": [170, 25, 130],
+        "min_score": 25000,
+        "shapes": [
+          [[1, 1, 0], [0, 1, 0], [0, 1, 1]],
+          [[0, 0, 1], [1, 1, 1], [1, 0, 0]]
+        ]
+      },
+      "I2": {
+        "name": "Line2",
+        "color": [50, 25, 60],
+        "min_score": 25000,
+        "shapes": [
+          [[1, 1]],
+          [[1], [1]]
+        ]
+      },
+      "P": {
+        "name": "P",
+        "color": [240, 170, 40],
+        "min_score": 30000,
+        "shapes": [
+          [[1, 1], [1, 1], [1, 0]],
+          [[1, 1, 1], [0, 1, 1]],
+          [[0, 1], [1, 1], [1, 1]],
+          [[1, 1, 0], [1, 1, 1]]
+        ]
+      },
+      "F": {
+        "name": "F",
+        "color": [135, 110, 65],
+        "min_score": 30000,
+        "shapes": [
+          [[0, 1, 1], [1, 1, 0], [0, 1, 0]],
+          [[0, 1, 0], [1, 1, 1], [0, 0, 1]],
+          [[0, 1, 0], [0, 1, 1], [1, 1, 0]],
+          [[1, 0, 0], [1, 1, 1], [0, 1, 0]]
+        ]
+      },
+      "S1": {
+        "name": "S1",
+        "color": [240, 110, 20],
+        "min_score": 30000,
+        "shapes": [
+          [[1, 0], [1, 0], [1, 1], [0, 1]],
+          [[0, 1, 1, 1], [1, 1, 0, 0]],
+          [[1, 0], [1, 1], [0, 1], [0, 1]],
+          [[0, 0, 1, 1], [1, 1, 1, 0]]
+        ]
+      },
+      "L1": {
+        "name": "L1",
+        "color": [45, 95, 175],
+        "min_score": 30000,
+        "shapes": [
+          [[1, 0], [1, 0], [1, 0], [1, 1]],
+          [[1, 1, 1, 1], [1, 0, 0, 0]],
+          [[1, 1], [0, 1], [0, 1], [0, 1]],
+          [[0, 0, 0, 1], [1, 1, 1, 1]]
+        ]
+      },
+      "F1": {
+        "name": "F1",
+        "color": [240, 230, 60],
+        "min_score": 0,
+        "shapes": [
+          [[0, 1], [1, 1], [0, 1], [0, 1]],
+          [[0, 0, 1, 0], [1, 1, 1, 1]],
+          [[1, 0], [1, 0], [1, 1], [1, 0]],
+          [[1, 1, 1, 1], [0, 1, 0, 0]]
+        ]
+      }
+    }
+  }
+}

configs/blocks_ADD_000.json

@@ -161,4 +161,3 @@
     }
     }
   }
-}

configs/config.json

@@ -0,0 +1,71 @@
+{
+  "CONFIG": {
+    "keys": {
+      "left": {
+        "__type__": "PygameKey",
+        "name": "K_LEFT"
+      },
+      "right": {
+        "__type__": "PygameKey",
+        "name": "K_RIGHT"
+      },
+      "rotate": {
+        "__type__": "PygameKey",
+        "name": "K_UP"
+      },
+      "drop": {
+        "__type__": "PygameKey",
+        "name": "K_DOWN"
+      },
+      "pause": {
+        "__type__": "PygameKey",
+        "name": "K_p"
+      },
+      "restart": {
+        "__type__": "PygameKey",
+        "name": "K_r"
+      },
+      "exit": {
+        "__type__": "PygameKey",
+        "name": "K_ESCAPE"
+      }
+    },
+    "controls_text": {
+      "__type__": "list",
+      "items": [
+        "Controls:",
+        "Left/Right Move",
+        "Up - Rotate",
+        "Dn - Drop",
+        "P - Pause",
+        "R - Restart",
+        "ESC - Exit"
+      ]
+    },
+    "colors": {
+      "background": {
+        "__type__": "tuple",
+        "items": [20, 20, 40]
+      },
+      "field": {
+        "__type__": "tuple",
+        "items": [30, 30, 60]
+      },
+      "border": {
+        "__type__": "tuple",
+        "items": [100, 100, 150]
+      },
+      "text": {
+        "__type__": "tuple",
+        "items": [255, 255, 255]
+      },
+      "game_over": {
+        "__type__": "tuple",
+        "items": [255, 0, 0]
+      }
+    },
+    "store_width": 10,
+    "block_size": 30,
+    "high_score_inc_speed": true
+  }
+}

das_tetris_gui.py

@@ -85,8 +85,7 @@ class TetrisGame:
         else:
             self.current_block = self.next_block
             self.current_block_rotation = self.next_block_rotation
-            while self.current_block == self.next_block:
+            self.next_block = self.choice_random_block(exclude=self.current_block)
-                self.next_block = self.choice_random_block()
             self.next_block_rotation = 0
 
         self.current_block_x = self.width // 2 - 2
@@ -97,11 +96,11 @@ class TetrisGame:
                                     self.current_block_rotation, self.current_block):
             self.game_over = True
 
-    def choice_random_block(self) -> BLOCK_TYPE:
+    def choice_random_block(self, exclude: BLOCK_TYPE = None) -> BLOCK_TYPE:
-        block: BLOCK_TYPE = random.choice(list(BLOCK_TYPE))
+        """Choose a random block allowed at the current score, avoiding `exclude` when possible"""
-        while self.get_block_min_score(block) > self.score:
+        allowed = [block for block in BLOCK_TYPE if self.get_block_min_score(block) <= self.score]
-            block = random.choice(list(BLOCK_TYPE))
+        candidates = [block for block in allowed if block != exclude] or allowed
-        return block
+        return random.choice(candidates)
 
     def get_block_shape(self, block_type: BLOCK_TYPE, rotation: int) -> List[List[int]]:
         """Get the shape matrix for a block at specific rotation"""
@@ -220,20 +219,21 @@ class TetrisGame:
         elapsed = (current_ticks - self.last_time) / 1000.0  # Convert to seconds
         self.last_time = current_ticks
 
+        # Highest threshold first, otherwise only the first branch is ever reached
         if cfg.HIGH_SCORE_INC_SPEED:
-            if self.score > 5000:
+            if self.score > 15000:
-                self.fall_speed = 0.55
+                self.fall_speed = 0.65
             elif self.score > 10000:
                 self.fall_speed = 0.6
-            elif self.score > 15000:
+            elif self.score > 5000:
-                self.fall_speed = 0.65
+                self.fall_speed = 0.55
         else:
-            if self.score > 5000:
+            if self.score > 15000:
-                self.fall_speed = 0.45
+                self.fall_speed = 0.35
             elif self.score > 10000:
                 self.fall_speed = 0.4
-            elif self.score > 15000:
+            elif self.score > 5000:
-                self.fall_speed = 0.35
+                self.fall_speed = 0.45
 
         if not self.game_over and not self.paused:
             self.fall_time += elapsed

tests/test_game.py

@@ -0,0 +1,70 @@
+import json
+import os
+import sys
+import unittest
+from pathlib import Path
+
+os.environ.setdefault('SDL_VIDEODRIVER', 'dummy')
+os.environ.setdefault('SDL_AUDIODRIVER', 'dummy')
+ROOT = Path(__file__).resolve().parent.parent
+sys.path.insert(0, str(ROOT))
+
+import das_tetris_gui as game_module  # noqa: E402
+import tetris_config as cfg  # noqa: E402
+
+
+class ConfigFilesTest(unittest.TestCase):
+    def test_all_config_files_are_valid_json(self):
+        for path in (ROOT / 'configs').glob('*.json'):
+            with self.subTest(path=path.name):
+                json.loads(path.read_text(encoding='utf-8'))
+
+    def test_default_config_used_when_local_missing(self):
+        missing = os.path.join(cfg.CONFIG_DIR, 'nonexistent.json')
+        self.assertIsNone(cfg._config_path(missing))
+        self.assertTrue(cfg._config_path(cfg.CONFIG_JSON).endswith('.json'))
+
+
+class TetrisGameTest(unittest.TestCase):
+    def setUp(self):
+        self.game = game_module.TetrisGame(width=10)
+
+    def test_random_block_respects_min_score(self):
+        self.game.score = 0
+        for _ in range(200):
+            self.assertEqual(self.game.get_block_min_score(self.game.choice_random_block()), 0)
+
+    def test_random_block_excludes_given_when_possible(self):
+        current = self.game.current_block
+        for _ in range(200):
+            self.assertNotEqual(self.game.choice_random_block(exclude=current), current)
+
+    def test_random_block_with_single_allowed_block_does_not_hang(self):
+        only = next(b for b in game_module.BLOCK_TYPE if b.value['min_score'] == 0)
+        original = self.game.get_block_min_score
+        self.game.get_block_min_score = lambda b: 0 if b == only else 10 ** 9
+        try:
+            self.assertEqual(self.game.choice_random_block(exclude=only), only)
+        finally:
+            self.game.get_block_min_score = original
+
+    def test_clear_lines_scoring(self):
+        self.game.field[-1] = [1] * 10
+        self.game.field[-2] = [1] * 10
+        self.assertEqual(self.game.clear_lines(), 2)
+        self.assertEqual(self.game.score, 300)
+        self.assertEqual(self.game.field[-1], [0] * 10)
+
+    def test_fall_speed_thresholds(self):
+        cases = {6000: (0.45, 0.55), 11000: (0.4, 0.6), 16000: (0.35, 0.65)}
+        for score, (normal, inc) in cases.items():
+            for flag, expected in ((False, normal), (True, inc)):
+                with self.subTest(score=score, flag=flag):
+                    cfg.HIGH_SCORE_INC_SPEED = flag
+                    self.game.score = score
+                    self.game.update(self.game.last_time)
+                    self.assertEqual(self.game.fall_speed, expected)
+
+
+if __name__ == '__main__':
+    unittest.main()

tetris_config.py

@@ -6,9 +6,16 @@ from enum import Enum
 import pygame
 from Serializer import EnumSerializer
 
-CONFIG_JSON = 'configs/config.json'
+# Resolve configs next to the script (or next to the executable when frozen by PyInstaller),
-CONFIG_BLOCKS_JSON = 'configs/blocks.json'
+# so the game does not depend on the current working directory
-CONFIG_ADD_BLOCKS_JSON = 'configs/blocks_ADD.json'
+BASE_DIR = os.path.dirname(sys.executable if getattr(sys, 'frozen', False) else os.path.abspath(__file__))
+CONFIG_DIR = os.path.join(BASE_DIR, 'configs')
+
+CONFIG_JSON = os.path.join(CONFIG_DIR, 'config.json')
+CONFIG_BLOCKS_JSON = os.path.join(CONFIG_DIR, 'blocks.json')
+CONFIG_ADD_BLOCKS_JSON = os.path.join(CONFIG_DIR, 'blocks_ADD.json')
+# Default configs ('*_000.json') are used when the local ones above are absent
+DEFAULT_SUFFIX = '_000'
 
 
 @dataclasses.dataclass
@@ -161,36 +168,66 @@ def store_config():
     es.save_to_file(config_to_save, CONFIG_JSON)
 
 
+def _config_path(path: str) -> str | None:
+    """Return the local config path, or its '*_000.json' default if the local one is absent"""
+    if os.path.isfile(path):
+        return path
+    root, ext = os.path.splitext(path)
+    default = root + DEFAULT_SUFFIX + ext
+    return default if os.path.isfile(default) else None
+
+
+def _fail(message: str):
+    print(f'Config error: {message}')
+    sys.exit(10)
+
+
+def _read_json(path: str) -> dict:
+    try:
+        with open(path, encoding='utf-8') as fd:
+            return json.load(fd)
+    except (OSError, json.JSONDecodeError) as e:
+        _fail(f'cannot read {path}: {e}')
+
+
 def load_config():
     global  KEY_CONFIG, COLORS, CONTROLS_TEXT, STORE_WIDTH, BLOCK_SIZE, BLOCK_TYPE, HIGH_SCORE_INC_SPEED
     es = EnumSerializer
 
-    if not os.path.isfile(CONFIG_JSON) or not os.path.isfile(CONFIG_JSON) :
+    config_path = _config_path(CONFIG_JSON)
-        print('No config files was found')
+    blocks_path = _config_path(CONFIG_BLOCKS_JSON)
-        sys.exit(10)
+    if config_path is None or blocks_path is None:
+        _fail(f'no config files were found in {CONFIG_DIR}')
 
-    config_data = es.load_from_file(CONFIG_JSON)
+    _read_json(config_path)  # validate JSON syntax with a clear message
-    KEY_CONFIG = config_data['CONFIG']['keys']
+    try:
-    CONTROLS_TEXT = config_data['CONFIG']['controls_text']
+        config = es.load_from_file(config_path)['CONFIG']
-    COLORS = config_data['CONFIG']['colors']
+        KEY_CONFIG = config['keys']
-    STORE_WIDTH = config_data['CONFIG']['store_width']
+        CONTROLS_TEXT = config['controls_text']
-    BLOCK_SIZE = config_data['CONFIG']['block_size']
+        COLORS = config['colors']
-    HIGH_SCORE_INC_SPEED = True if str(config_data['CONFIG']['high_score_inc_speed']).lower() == 'true' else False
+        STORE_WIDTH = config['store_width']
+        BLOCK_SIZE = config['block_size']
+    except (KeyError, TypeError) as e:
+        _fail(f'missing key {e} in {config_path}')
+    HIGH_SCORE_INC_SPEED = str(config.get('high_score_inc_speed', False)).lower() == 'true'
 
-    with open(CONFIG_BLOCKS_JSON) as block_fd:
+    try:
-        blocks_data = json.load(block_fd)
+        blocks0 = _read_json(blocks_path)['ALL_BLOCKS']['members']
-
+    except (KeyError, TypeError) as e:
-    blocks0 = blocks_data['ALL_BLOCKS']['members']
+        _fail(f'missing key {e} in {blocks_path}')
 
     blocks1 = {}
-    if os.path.isfile(CONFIG_ADD_BLOCKS_JSON):
+    add_blocks_path = _config_path(CONFIG_ADD_BLOCKS_JSON)
-        with open(CONFIG_ADD_BLOCKS_JSON) as block_fd:
+    if add_blocks_path is not None:
-            blocks_data1 = json.load(block_fd)
+        try:
-        blocks1 = blocks_data1['ADDITIONAL_BLOCKS']['members']
+            blocks1 = _read_json(add_blocks_path)['ADDITIONAL_BLOCKS']['members']
+        except (KeyError, TypeError) as e:
+            _fail(f'missing key {e} in {add_blocks_path}')
 
     blocks = blocks0 | blocks1
+    if not any(block['min_score'] <= 0 for block in blocks.values()):
+        _fail('at least one block must have min_score 0')
     BLOCK_TYPE = Enum('BlockType', blocks)
 
-
 if __name__ == '__main__':
     pass