original variable parameters

tests/test_variableparameters.py

@@ -0,0 +1,64 @@
+from dataclasses import field
+
+import pytest
+
+from scgenerator.variableparameters import Variable, vdataclass, vfield
+
+
+def test_vfield_identification():
+    """only vfields and not normal fields count"""
+
+    class Conf:
+        x: int
+
+    with pytest.warns(UserWarning):
+        vdataclass(Conf)
+
+    @vdataclass
+    class Conf2:
+        x: Variable = vfield(default=5)
+
+    assert hasattr(Conf2, "filter")
+
+
+def test_constant():
+    """classes with constant fields don't increase size and always return the constant"""
+
+    @vdataclass
+    class Conf:
+        x: Variable = vfield(default=3)
+        y: Variable = vfield(default=4)
+
+    conf = Conf()
+    assert len(conf) == 1
+    assert conf.x(0) == 3
+    assert conf.y(0) == 4
+
+    with pytest.raises(ValueError):
+        conf.x(1)
+    with pytest.raises(ValueError):
+        conf.y(1)
+
+
+def test_decoration():
+    """proper construction of the class"""
+
+
+def test_name_error():
+    """name errors are raised when accessing inexistent variable (direct, filter, ...)"""
+
+
+def test_defaults():
+    """default values are respected, of proper type and of size one"""
+
+
+def test_formatting():
+    """formatting is always respected"""
+
+
+def test_param_parsing():
+    """parsing a string or path returns the correct values"""
+
+
+def test_config_parsing():
+    """parsing a string returns the exact id corresponding to the string/path"""