domain repos for PE numbers and task orders

tests/domain/test_pe_numbers.py

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+import pytest
+
+from atst.domain.exceptions import NotFoundError
+from atst.domain.pe_numbers import PENumbers
+
+from tests.factories import PENumberFactory
+
+
+@pytest.fixture()
+def pe_numbers(db):
+    return PENumbers(db)
+
+@pytest.fixture(scope="function")
+def new_pe_number(db):
+    def make_pe_number(**kwargs):
+        pen = PENumberFactory.create(**kwargs)
+        db.add(pen)
+        db.commit()
+
+        return pen
+
+    return make_pe_number
+
+
+def test_can_get_pe_number(pe_numbers, new_pe_number):
+    new_pen = new_pe_number(number="0101969F", description="Combat Support - Offensive")
+    pen = pe_numbers.get(new_pen.number)
+
+    assert pen.number == new_pen.number
+
+
+def test_nonexistent_pe_number_raises(pe_numbers):
+    with pytest.raises(NotFoundError):
+        pe_numbers.get("some fake number")