diff --git a/.coveragerc b/.coveragerc
new file mode 100644
index 0000000..2dc3d8b
--- /dev/null
+++ b/.coveragerc
@@ -0,0 +1,8 @@
+[run]
+source = validate_docbr
+disable_warnings = no-data-collected
+
+[report]
+fail_under = 97.50
+precision = 2
+show_missing = True
diff --git a/tests/__init__.py b/tests/__init__.py
index ecadf74..e69de29 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -1 +0,0 @@
-from tests import *
diff --git a/tests/test_CNPJ.py b/tests/test_CNPJ.py
index 1eea631..cfcfe9e 100644
--- a/tests/test_CNPJ.py
+++ b/tests/test_CNPJ.py
@@ -29,7 +29,7 @@ def test_mask(self):
         self.assertEqual(masked_cnpj, '11.222.333/4444-55')
 
     def test_special_case(self):
-        """ Verifica os casos especiais de CNPJ """
+        """Verifica os casos especiais de CNPJ."""
         cases = [
             ('00000-000/0000', False),
             ('AAAA0AAAAAAA2AAAAAA', False),
@@ -37,3 +37,36 @@ def test_special_case(self):
         ]
         for cnpj, is_valid in cases:
             self.assertEqual(self.cnpj.validate(cnpj), is_valid)
+
+    def test_validate_success(self):
+        """Testar o método validate do CNPJ."""
+        # GIVEN
+        doc = '74600269000145'
+
+        # WHEN
+        validate_return = self.cnpj.validate(doc)
+
+        # THEN
+        self.assertTrue(validate_return)
+
+    def test_validate_wrong_input(self):
+        """Testar o método validate do CNPJ em caso de input errado."""
+        # GIVEN
+        doc = '74600269000145_'
+
+        # WHEN
+        validate_return = self.cnpj.validate(doc)
+
+        # THEN
+        self.assertFalse(validate_return)
+
+    def test_validate_wrong_length(self):
+        """Testar o método validate do CNPJ em caso de tamanho inválido."""
+        # GIVEN
+        doc = '746002690001450'
+
+        # WHEN
+        validate_return = self.cnpj.validate(doc)
+
+        # THEN
+        self.assertFalse(validate_return)
diff --git a/tests/test_generic.py b/tests/test_generic.py
index 60c1f87..2cbb0dd 100644
--- a/tests/test_generic.py
+++ b/tests/test_generic.py
@@ -1,5 +1,5 @@
-import unittest
 import random
+import unittest
 
 import validate_docbr as docbr
 
@@ -34,7 +34,7 @@ def test_correct_argument(self):
 
             # Documentos aleatórios
             len_doc = len(DocClass().generate())
-            for i in range(200):
+            for _ in range(200):
                 random_doc = get_random_number_str(len_doc)
                 documents += [(DocClass, random_doc)]
                 right_answers += [DocClass().validate(random_doc)]