diff --git a/.github/pull_request_template.md b/.github/pull_request_template.md
new file mode 100644
index 0000000..9f609e7
--- /dev/null
+++ b/.github/pull_request_template.md
@@ -0,0 +1,14 @@
+\[Title should should be clear and concise, like:
+
+Adds ___ to ___  
+
+Fixes # ___ in ___ \]
+### Summary
+\[Summarize what this pull request does, i.e. fixes __ or adds __, a nifty feature.\]
+
+### Description
+\[Go into more detail about what the pull request does. For example, reference
+opened/closed issues or detail reasoning for adding a feature.\]
+
+### Team Notifications
+\[Who should be notified to review the pull request. Likely @JoseALermaIII\]
diff --git a/src/ch03/p1_digram_counter.py b/src/ch03/p1_digram_counter.py
index 90041bd..f3162d8 100644
--- a/src/ch03/p1_digram_counter.py
+++ b/src/ch03/p1_digram_counter.py
@@ -93,7 +93,7 @@ def main():
     print(f'Analyzing: {word}\n')
     print('In the Ubuntu default `american-english` dictionary, these are\n'
           'the digram counts for the above word:')
-    digram_count = digram_counter(word)
+    digram_count = digram_counter(word, DICTIONARY_FILE_PATH)
     print_bar_chart(digram_count)
     top_digram = sorted(digram_count.keys())[0]
     print(f'\nThe "{top_digram}" digram occurs {digram_count[top_digram]} '
diff --git a/tests/data/ch03/dictionary.txt b/tests/data/ch03/dictionary.txt
index 9ee43b4..46d3009 100644
--- a/tests/data/ch03/dictionary.txt
+++ b/tests/data/ch03/dictionary.txt
@@ -9,6 +9,10 @@ boson
 c
 cat
 catatonic
+cool
+coot
+cover
+coverage
 d
 dog
 dirge
@@ -23,8 +27,11 @@ gecko
 gopher
 h
 heels
+hello
 hemoglobin
 hermit
+hoot
+hover
 i
 imp
 indigo
@@ -40,6 +47,8 @@ l
 lemon
 less
 lime
+loss
+lovely
 m
 mesolithic
 moonlight
@@ -55,10 +64,13 @@ pat
 patti
 penny
 pepper
+pillow
 pip
 pit
 pita
 pitt
+polo
+pool
 q
 quasar
 quark
@@ -66,6 +78,9 @@ r
 riddle
 rubber
 s
+salve
+salvo
+servlet
 set
 slight
 swift
@@ -85,6 +100,8 @@ umbra
 v
 venus
 vertiginous
+vocal
+vocation
 w
 whip
 whirl
diff --git a/tests/data/ch03/main/digram_counter.txt b/tests/data/ch03/main/digram_counter.txt
index fd95106..739c59f 100644
--- a/tests/data/ch03/main/digram_counter.txt
+++ b/tests/data/ch03/main/digram_counter.txt
@@ -7,13 +7,13 @@ Analyzing: volvo
 
 In the Ubuntu default `american-english` dictionary, these are
 the digram counts for the above word:
-Counter({'lo': 3554,
-         'ol': 3376,
-         'oo': 2265,
-         'ov': 1223,
-         'vo': 603,
-         'lv': 260,
-         'vv': 21,
-         'vl': 12})
+Counter({'lo': 7,
+         'oo': 6,
+         'ol': 5,
+         'ov': 4,
+         'vo': 3,
+         'lv': 2,
+         'vl': 1,
+         'vv': 0})
 
-The "lo" digram occurs 3554 times!
+The "lo" digram occurs 7 times!
diff --git a/tests/test_chapter03.py b/tests/test_chapter03.py
index c5aef4d..067df6c 100644
--- a/tests/test_chapter03.py
+++ b/tests/test_chapter03.py
@@ -53,6 +53,8 @@ def test_digram_counter(self):
         self.assertDictEqual(count, test_count)
 
     @unittest.mock.patch('sys.stdout', new_callable=StringIO)
+    @unittest.mock.patch('src.ch03.p1_digram_counter.DICTIONARY_FILE_PATH',
+                         'tests/data/ch03/dictionary.txt')
     def test_main(self, mock_stdout):
         """Test demo main function."""
         digram_counter.main()
diff --git a/tests/test_chapter06.py b/tests/test_chapter06.py
index 8399c31..6f7f43d 100644
--- a/tests/test_chapter06.py
+++ b/tests/test_chapter06.py
@@ -2,6 +2,10 @@
 import os
 import unittest.mock
 from io import StringIO
+
+from docx import Document
+from docx.shared import RGBColor
+
 import src.ch06.p1_invisible_ink as invisible_ink
 
 
@@ -69,6 +73,13 @@ def test_write_invisible(self):
         self.assertEqual(len(all_text), len(output_text))
         for line in output_text:
             self.assertIn(line, all_text)
+        # Check color
+        doc = Document(output_file)
+        for paragraph in doc.paragraphs:
+            if paragraph.text in ciphertext:
+                for run in paragraph.runs:
+                    self.assertEqual(run.font.color.rgb,
+                                     RGBColor(255, 255, 255))
         os.remove(output_file)
         # Test custom template and filename.
         template_file = os.path.normpath('tests/data/ch06/template.docx')
@@ -81,6 +92,13 @@ def test_write_invisible(self):
         self.assertEqual(len(all_text), len(output_text))
         for line in output_text:
             self.assertIn(line, all_text)
+        # Check color
+        doc = Document(output_file)
+        for paragraph in doc.paragraphs:
+            if paragraph.text in ciphertext:
+                for run in paragraph.runs:
+                    self.assertEqual(run.font.color.rgb,
+                                     RGBColor(255, 255, 255))
         os.remove(output_file)
         # Test error.
         faketext = invisible_ink.get_text(fakefile)