pattern printing pyramids and unit test cases (#85)

* pattern printing pyramids and unit test cases

* Changed naming convention pyramid print and documentation added

Author: AndrewHUNGNguyen

easyPythonpi/methods/patternprinting.py

@@ -0,0 +1,26 @@
+#!/usr/bin/env python
+#-*- coding: utf-8 -*-
+
+def print_pyramid(num_rows: 'int', char: 'str') -> 'None':
+    """
+    Parameters
+    ----------
+    num_rows : int
+        The number of rows a pyramid should have
+    char : str
+        The character to print out when displaying the pyramid
+        e.g. using method like print_pyramid(3, &) will print as below:
+            &
+            &&
+            &&&
+
+    Returns
+    ----------
+    None
+    """
+
+    for i in range(num_rows):
+        for j in range(i+1):
+            print(char, end="") 
+        print()
+        

easyPythonpi/test/test_patternprinting.py

@@ -0,0 +1,67 @@
+#!/usr/bin/env python
+#-*- coding: utf-8 -*-
+
+import unittest
+from unittest.mock import patch
+from methods.patternprinting import print_pyramid
+from io import StringIO
+import sys
+import contextlib 
+
+class TestPrintPyramid(unittest.TestCase):
+    @patch('builtins.print')
+    def test_patternprinting_numrows_zero_call_print_zero_times(self, mock_print):
+        print_pyramid(0, '*')
+        self.assertEqual(mock_print.call_count, 0)
+
+    def test_pyramid_pattern_printing_zerorows_asteriks(self):
+        expected_output = ''
+        
+        with StringIO() as buffer, contextlib.redirect_stdout(buffer):
+            print_pyramid(0, "*")
+            printed_output = buffer.getvalue()
+
+        self.assertEqual(printed_output, expected_output) 
+
+    @patch('builtins.print')
+    def test_patternprinting_numrows_three_call_print_twenty_times(self, mock_print):
+        print_pyramid(5, '*')
+        self.assertEqual(mock_print.call_count, 20)
+
+    def test_pyramid_pattern_printing_fiverows_asteriks(self):
+        expected_output = (
+            "*\n"
+            "**\n"
+            "***\n"
+            "****\n"
+            "*****\n"
+        )
+        
+        # Assert that the printed output contains the expected parameter
+        with StringIO() as buffer, contextlib.redirect_stdout(buffer):
+            print_pyramid(5, "*")
+            printed_output = buffer.getvalue()
+
+        self.assertEqual(printed_output, expected_output) 
+
+    @patch('builtins.print')
+    def test_patternprinting_numrows_three_call_print_nine_times(self, mock_print):
+        print_pyramid(3, '&')
+        self.assertEqual(mock_print.call_count, 9)
+
+    def test_pyramid_pattern_printing_fiverows_ampersand(self):
+        expected_output = (
+            "&\n"
+            "&&\n"
+            "&&&\n"
+        )
+        
+        # Assert that the printed output contains the expected parameter
+        with StringIO() as buffer, contextlib.redirect_stdout(buffer):
+            print_pyramid(3, "&")
+            printed_output = buffer.getvalue()
+
+        self.assertEqual(printed_output, expected_output) 
+
+if __name__ == '__main__':
+    unittest.main()