Added tests for code quality (#72)

Author: czgdp1807

pydatastructs/utils/tests/__init__.py

@@ -0,0 +1,61 @@
+import os, re, sys
+
+def _list_files():
+    root_path = os.path.abspath(
+                os.path.join(
+                os.path.split(__file__)[0],
+                os.pardir, os.pardir))
+    py_files = []
+    for (dirpath, _, filenames) in os.walk(root_path):
+        for _file in filenames:
+            if re.match(r".*\.py$", _file):
+                py_files.append(os.path.join(dirpath, _file))
+    return py_files
+
+def test_trailing_white_spaces():
+    py_files = _list_files()
+    for file_path in py_files:
+        file = open(file_path, "r")
+        line = file.readline()
+        while line != "":
+            if line.endswith(" \n") or line.endswith("\t\n") \
+                or line.endswith(" ") or line.endswith("\t"):
+                assert False, "%s contains trailing whitespace at %s"\
+                               %(file_path, line)
+            line = file.readline()
+        file.close()
+
+def test_final_new_lines():
+    py_files = _list_files()
+    for file_path in py_files:
+        file = open(file_path, "r")
+        lines = []
+        line = file.readline()
+        while line != "":
+            lines.append(line)
+            line = file.readline()
+        if lines:
+            if lines[-1][-1] != "\n":
+                assert False, "%s doesn't contain new line at the end."%(file_path)
+            if lines[-1] == "\n" and lines[-2][-1] == "\n":
+                assert False, "%s contains multiple new lines at the end."%(file_path)
+        file.close()
+
+def test_comparison_True_False_None():
+    py_files = _list_files()
+    for file_path in py_files:
+        if file_path.find("test_code_quality.py") == -1:
+            file = open(file_path, "r")
+            line = file.readline()
+            while line != "":
+                if ((line.find("== True") != -1) or
+                    (line.find("== False") != -1) or
+                    (line.find("== None") != -1) or
+                    (line.find("!= True") != -1) or
+                    (line.find("!= False") != -1) or
+                    (line.find("!= None") != -1)):
+                    assert False, "%s compares True/False/None using by "\
+                                "value, should be done by reference at %s"\
+                                %(file_path, line)
+                line = file.readline()
+            file.close()