Tests cleaning & simplification (#81)

tests/utils.py

@@ -1,6 +1,37 @@
-import os
+import pytest
+import torch
+
+from lerobot.common.utils.import_utils import is_package_available
 
 # Pass this as the first argument to init_hydra_config.
 DEFAULT_CONFIG_PATH = "lerobot/configs/default.yaml"
 
-DEVICE = os.environ.get('LEROBOT_TESTS_DEVICE', "cuda")
+DEVICE = "cuda" if torch.cuda.is_available() else "cpu"
+
+
+def require_env(func):
+    """
+    Decorator that skips the test if the required environment package is not installed.
+    As it need 'env_name' in args, it also checks whether it is provided as an argument.
+    """
+    from functools import wraps
+
+    @wraps(func)
+    def wrapper(*args, **kwargs):
+        # Determine if 'env_name' is provided and extract its value
+        arg_names = func.__code__.co_varnames[: func.__code__.co_argcount]
+        if "env_name" in arg_names:
+            # Get the index of 'env_name' and retrieve the value from args
+            index = arg_names.index("env_name")
+            env_name = args[index] if len(args) > index else kwargs.get("env_name")
+        else:
+            raise ValueError("Function does not have 'env_name' as an argument.")
+
+        # Perform the package check
+        package_name = f"gym_{env_name}"
+        if not is_package_available(package_name):
+            pytest.skip(f"gym-{env_name} not installed")
+
+        return func(*args, **kwargs)
+
+    return wrapper