Set birth year given multiple formats (#201)

* Add test case for birth year 'mm/dd/yyyy' format

When the user searches for a record passing in the birth date format
then the response returned also includes that birth date instead of the
default value (birth year).

* Set birth year with different date formats

Split argument on '/' and assign the birth year only.

Fixes #200

src/backend/expungeservice/models/case.py

@@ -29,6 +29,6 @@ def closed(self):
     @staticmethod
     def _set_birth_year(info):
         if len(info) > 1:
-            return int(info[1])
+            return int(info[1].split('/')[-1])
         else:
             return ''

src/backend/tests/models/test_case.py

@@ -42,7 +42,8 @@ def test_it_returns_true_for_an_inactive_case(self):
         assert self.case.closed() is True
 
 
-class TestBirthYearDefaultValue(unittest.TestCase):
+class TestBirthYearInitializesGivenMultipleValues(unittest.TestCase):
+
     def setUp(self):
         self.case = CaseFactory.build()
 
@@ -51,3 +52,15 @@ def test_birth_year_defaults_to_empty_string(self):
         case = CaseFactory.save(self.case)
 
         assert case.birth_year == ''
+
+    def test_it_assigns_birth_year_when_given_the_year(self):
+        self.case['info'] = ['John Doe', '1979']
+        case = CaseFactory.save(self.case)
+
+        assert case.birth_year == 1979
+
+    def test_it_assigns_birth_year_when_given_the_month_day_year_format(self):
+        self.case['info'] = ['John Doe', '12/21/1979']
+        case = CaseFactory.save(self.case)
+
+        assert case.birth_year == 1979