Quality tests for API (#255)

* API reports(only when API tests pass) will be generated showing which methods have been implemented in a class and it's parent classes.

Author: czgdp1807

.coveragerc

@@ -3,6 +3,7 @@ parallel = True
 source = pydatastructs
 omit =
     */tests/*
+    */setup.py
 
 [report]
 exclude_lines =

.travis.yml

@@ -8,7 +8,7 @@ install:
         - pip install -r requirements.txt
 
 script:
-        - python -m pytest --doctest-modules --cov=./ --cov-report=xml
+        - python -m pytest --doctest-modules --cov=./ --cov-report=xml -s
 
 after_success:
         - codecov

pydatastructs/graphs/adjacency_list.py

@@ -23,6 +23,12 @@ def __new__(cls, *vertices):
         obj.edge_weights = dict()
         return obj
 
+    @classmethod
+    def methods(self):
+        return ['is_adjacent', 'neighbors',
+        'add_vertex', 'remove_vertex', 'add_edge',
+        'get_edge', 'remove_edge', '__new__']
+
     def is_adjacent(self, node1, node2):
         node1 = self.__getattribute__(node1)
         return hasattr(node1, node2)

pydatastructs/graphs/adjacency_matrix.py

@@ -26,6 +26,12 @@ def __new__(cls, *vertices):
         obj.edge_weights = dict()
         return obj
 
+    @classmethod
+    def methods(self):
+        return ['is_adjacent', 'neighbors',
+        'add_edge', 'get_edge', 'remove_edge',
+        '__new__']
+
     def is_adjacent(self, node1, node2):
         node1, node2 = str(node1), str(node2)
         row = self.matrix.get(node1, dict())

pydatastructs/linear_data_structures/arrays.py

@@ -109,6 +109,12 @@ def __new__(cls, dtype=NoneType, *args, **kwargs):
 
         return obj
 
+    @classmethod
+    def methods(cls):
+        return ['__new__', '__getitem__',
+        '__setitem__', 'fill', '__len__',
+        '__str__']
+
     def __getitem__(self, i):
         if i >= self._size or i < 0:
             raise IndexError("Index out of range.")
@@ -215,6 +221,12 @@ def __new__(cls, dtype=NoneType, *args, **kwargs):
         obj._last_pos_filled = obj._num - 1
         return obj
 
+    @classmethod
+    def methods(cls):
+        return ['__new__', '_modify',
+        'append', 'delete', 'size',
+        '__str__', '__reversed__']
+
     def _modify(self, force=False):
         """
         Contracts the array if Num(T)/Size(T) falls