Melhorando os testes do método is_valid para o CNPJ (#114)

brutils/cnpj.py

@@ -93,7 +93,7 @@ def is_valid(cnpj):  # type: (str) -> bool
     Using this method name to match with the js library  api.
     Using the same method to ensure backwards compatibility.
     """
-    return validate(cnpj)
+    return isinstance(cnpj, str) and validate(cnpj)
 
 
 def generate(branch=1):  # type: (int) -> str

tests/test_cnpj.py

@@ -50,31 +50,55 @@ def test_format_cnpj(self):
         assert format_cnpj("0000000000000a") is None
         assert format_cnpj("0000000000000") is None
 
-    def test_hashdigit(self):
-        assert hashdigit("00000000000000", 13) == 0
-        assert hashdigit("00000000000000", 14) == 0
-        assert hashdigit("52513127000292", 13) == 9
-        assert hashdigit("52513127000292", 14) == 9
-
-    def test_checksum(self):
-        assert checksum("00000000000000") == "00"
-        assert checksum("52513127000299") == "99"
-
     def test_validate(self):
         assert validate("34665388000161")
         assert not validate("52599927000100")
         assert not validate("00000000000")
 
     def test_is_valid(self):
+        # When CNPJ is not string, returns False
+        assert not is_valid(1)
+
+        # When CNPJ's len is different of 14, returns False
+        assert not is_valid("1")
+
+        # When CNPJ does not contain only digits, returns False
+        assert not is_valid("1112223334445-")
+
+        # When CNPJ has only the same digit, returns false
+        assert not is_valid("11111111111111")
+
+        # When rest_1 is lt 2 and the 13th digit is not 0, returns False
+        assert not is_valid("1111111111315")
+
+        # When rest_1 is gte 2 and the 13th digit is not (11 - rest), returns False
+        assert not is_valid("1111111111115")
+
+        # When rest_2 is lt 2 and the 14th digit is not 0, returns False
+        assert not is_valid("11111111121205")
+
+        # When rest_2 is gte 2 and the 14th digit is not (11 - rest), returns False
+        assert not is_valid("11111111113105")
+
+        # When CNPJ is valid
         assert is_valid("34665388000161")
-        assert not is_valid("52599927000100")
-        assert not is_valid("00000000000")
+        assert is_valid("01838723000127")
 
     def test_generate(self):
         for i in range(1000):
             assert validate(generate())
             assert display(generate()) is not None
 
+    def test_hashdigit(self):
+        assert hashdigit("00000000000000", 13) == 0
+        assert hashdigit("00000000000000", 14) == 0
+        assert hashdigit("52513127000292", 13) == 9
+        assert hashdigit("52513127000292", 14) == 9
+
+    def test_checksum(self):
+        assert checksum("00000000000000") == "00"
+        assert checksum("52513127000299") == "99"
+
 
 if __name__ == "__main__":
     main()