Fix method metadata and add metadata tests

Author: pganssle

src/variants/_variants.py

@@ -63,6 +63,7 @@ class VariantMethod(VariantFunction):
         def __init__(self, variant_func, instance):
             self.__instance = instance
             self.__name__ = variant_func.__name__
+            self.__doc__ = variant_func.__doc__
 
             # Convert existing variants to methods
             for vname in variant_func._variants:

tests/test_functions.py

@@ -92,4 +92,4 @@ def test_docstring():
 
 
 def test_repr():
-    assert repr(divide) == '<VariantFunction divide>'
+    assert repr(divide) == '<VariantFunction divide>'

tests/test_instance_methods.py

@@ -16,6 +16,7 @@ def __init__(self, x):
 
     @variants
     def divide(self, y):
+        """Function that divides the bound x by y."""
         return self.x / y
 
     @divide.variant('round')
@@ -42,6 +43,8 @@ def divide(self, y, mode=None):
         return funcs[mode](y)
 
 
+###
+# Test divide instance methods
 @pytest.mark.parametrize('x,y,expected', DivisionData.DIV_VALS)
 def test_divide(x, y, expected):
     dv = DivisionVariants(x)
@@ -79,4 +82,16 @@ def test_mode_change_x(x, y, expected, mode):
     assert dv.divide.mode(y, mode) == expected
 
     dv.x = 0
-    assert dv.divide.mode(y, mode) == 0
+    assert dv.divide.mode(y, mode) == 0
+
+
+###
+# Division instance method metadata tests
+def test_name():
+    dv = DivisionVariants(0)
+    assert dv.divide.__name__ == 'divide'
+
+
+def test_docstring():
+    dv = DivisionVariants(0)
+    assert dv.divide.__doc__ == """Function that divides the bound x by y."""