✅ Add test for nullable fields

Author: JonasKs

tests/test_nullable.py

@@ -0,0 +1,26 @@
+from typing import Optional
+
+from sqlmodel import Field, SQLModel, create_engine
+
+
+def test_nullable_fields_set_properly(clear_sqlmodel, caplog):
+    class Hero(SQLModel, table=True):
+        nullable_integer_primary_key: Optional[int] = Field(
+            default=None, primary_key=True
+        )
+        not_null_string: str = Field(default=..., nullable=False)
+        nullable_optional_string: Optional[str] = Field(default=None, nullable=True)
+        nullable_integer: Optional[int] = None
+        not_null_integer: int
+
+    engine = create_engine("sqlite://", echo=True)
+    SQLModel.metadata.create_all(engine)
+
+    create_table_log = [
+        message for message in caplog.messages if "CREATE TABLE hero" in message
+    ][0]
+    assert "\n\tnullable_integer_primary_key INTEGER NOT NULL," in create_table_log
+    assert "\n\tnot_null_string VARCHAR NOT NULL," in create_table_log
+    assert "\n\tnullable_optional_string VARCHAR," in create_table_log
+    assert "\n\tnullable_integer INTEGER," in create_table_log
+    assert "\n\tnot_null_integer INTEGER NOT NULL," in create_table_log