diff --git a/flask_bootstrap/__init__.py b/flask_bootstrap/__init__.py
index 4cefb120..56fcfdd5 100644
--- a/flask_bootstrap/__init__.py
+++ b/flask_bootstrap/__init__.py
@@ -10,7 +10,7 @@ def is_hidden_field_filter(field):
     return isinstance(field, HiddenField)
 
 
-def raise_helper(message):  # pragma: no cover
+def raise_helper(message):
     raise RuntimeError(message)
 
 
@@ -23,7 +23,7 @@ def get_table_titles(data, primary_key, primary_key_title):
         return []
     titles = []
     for k in data[0].__table__.columns.keys():
-        if not k.startswith('_'):
+        if not k.startswith('_'):  # pragma: no branch
             titles.append((k, k.replace('_', ' ').title()))
     titles[0] = (primary_key, primary_key_title)
     return titles
@@ -50,13 +50,13 @@ class _Bootstrap:
     popper_filename = 'popper.min.js'
 
     def __init__(self, app=None):
-        if app is not None:
+        if app is not None:  # pragma: no branch
             self.init_app(app)
 
     def init_app(self, app):
 
         if not hasattr(app, 'extensions'):
-            app.extensions = {}
+            app.extensions = {}  # pragma: no cover
         app.extensions['bootstrap'] = self
 
         blueprint = Blueprint('bootstrap', __name__, static_folder=f'static/{self.static_folder}',
diff --git a/tests/test_bootstrap4/test_bootstrap.py b/tests/test_bootstrap4/test_bootstrap.py
index 4d5599db..f4749faa 100644
--- a/tests/test_bootstrap4/test_bootstrap.py
+++ b/tests/test_bootstrap4/test_bootstrap.py
@@ -1,10 +1,14 @@
 import pytest
 from flask import current_app, render_template_string
-from flask_bootstrap import CDN_BASE
+from flask_bootstrap import CDN_BASE, raise_helper
 
 
 @pytest.mark.usefixtures('client')
 class TestBootstrap:
+    def test_raise_helper(self):
+        with pytest.raises(RuntimeError, match='Test message'):
+            raise_helper('Test message')
+
     def test_deprecate_bootstrap_class(self):
         from flask_bootstrap import Bootstrap
         from flask import Flask
diff --git a/tests/test_bootstrap4/test_render_table.py b/tests/test_bootstrap4/test_render_table.py
index 2efc87dd..c94881ef 100644
--- a/tests/test_bootstrap4/test_render_table.py
+++ b/tests/test_bootstrap4/test_render_table.py
@@ -193,7 +193,6 @@ def test():
     assert '<table class="table">' in data
     assert '<th scope="col">#</th>' in data
     assert '<th scope="col">Text</th>' in data
-    assert '<th scope="col">Text</th>' in data
     assert '<th scope="row">1</th>' in data
     assert '<td>Test message 1</td>' in data