Fix StaticField + tests for StaticField and unset optional TextField

tests/test_records.py

@@ -7,6 +7,7 @@ from pyaccuwage.fields import MoneyField
 from pyaccuwage.fields import StateField
 from pyaccuwage.fields import TextField
 from pyaccuwage.fields import ZeroField
+from pyaccuwage.fields import StaticField
 from pyaccuwage.model import Model
 
 class TestModelOutput(unittest.TestCase):
@@ -20,7 +21,8 @@ class TestModelOutput(unittest.TestCase):
         money = MoneyField(max_length=32)
         state_txt = StateField()
         state_num = StateField(use_numeric=True)
-        blank2 = BlankField(max_length=24)
+        blank2 = BlankField(max_length=12)
+        static1 = StaticField(value='hey mister!!')
 
     def setUp(self):
         self.model = TestModelOutput.TestModel()
@@ -42,7 +44,8 @@ class TestModelOutput(unittest.TestCase):
             b'313377'.zfill(32),
             b'IA',
             b'19',
-            b' ' * 24,
+            b' ' * 12,
+            b'hey mister!!',
             ])
 
         output = model.output()
@@ -64,6 +67,7 @@ field2: 12345
 money: 3133.77
 state_txt: IA
 state_num: IA
+static1: hey mister!!
 
 ''')