From d851405b6b17053f6daa48ef5b3b251b6dcdf8df Mon Sep 17 00:00:00 2001
From: David Kilias <david.kilias@gmail.com>
Date: Thu, 5 Nov 2020 17:04:02 +0100
Subject: [PATCH] add validator functions and tests

---
 validators/test_validators.py | 37 +++++++++++++++++++++++++++++++++++
 validators/validators.py      | 34 ++++++++++++++++++++++++++++++++
 2 files changed, 71 insertions(+)
 create mode 100644 validators/test_validators.py
 create mode 100644 validators/validators.py

diff --git a/validators/test_validators.py b/validators/test_validators.py
new file mode 100644
index 0000000..b959892
--- /dev/null
+++ b/validators/test_validators.py
@@ -0,0 +1,37 @@
+from validators import mandatory, empty, iso_date, valid_iban, valid_bic
+
+
+def test_mandatory():
+    assert mandatory("Foo") == True
+    assert mandatory("Foo Bar") == True
+    assert mandatory("1970-01-01") == True
+    assert mandatory("") == False
+
+
+def test_empty():
+    assert empty("") == True
+    assert empty(" ") == False
+    assert empty("Foo") == False
+    assert empty("1970-01-01") == False
+
+
+def test_iso_date():
+    assert iso_date("1970-01-01") == True
+    assert iso_date("1970-1-1") == True
+    assert iso_date("70-01-01") == False
+    assert iso_date("1970/01/01") == False
+    assert iso_date("1.1.1970") == False
+    assert iso_date("01.01.1970") == False
+
+
+def test_valid_iban():
+    assert valid_iban("DE89 3704 0044 0532 0130 00") == True
+    assert valid_iban("DX89 3704 0044 0532 0130 00") == False
+    assert valid_iban("DE99 3704 0044 0532 0130 00") == False
+
+
+def test_valid_bic():
+    assert valid_bic("PBNKDEFFXXX") == True
+    assert valid_bic("PBNKDXFFXXX") == False
+    assert valid_bic("PBNKDXFFXXXX") == False
+    assert valid_bic("PBN1DXFFXXX") == False
diff --git a/validators/validators.py b/validators/validators.py
new file mode 100644
index 0000000..aadab3e
--- /dev/null
+++ b/validators/validators.py
@@ -0,0 +1,34 @@
+import datetime
+from schwifty import IBAN, BIC
+
+
+def mandatory(field: str) -> bool:
+    return bool(field)
+
+
+def empty(field: str) -> bool:
+    return not bool(field)
+
+
+def iso_date(field: str) -> bool:
+    try:
+        datetime.datetime.strptime(field, "%Y-%m-%d")
+        return True
+    except ValueError:
+        return False
+
+
+def valid_iban(field: str) -> bool:
+    try:
+        IBAN(field)
+        return True
+    except ValueError:
+        return False
+
+
+def valid_bic(field: str) -> bool:
+    try:
+        BIC(field)
+        return True
+    except ValueError:
+        return False