diff --git a/pyproject.toml b/pyproject.toml
index a95b28c..c4a2f9b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,3 +18,9 @@ build-backend = "hatchling.build"
 
 [tool.hatch.build.targets.wheel]
 packages = ["src/megasniff"]
+
+[dependency-groups]
+dev = [
+    "pytest>=8.4.1",
+    "pytest-cov>=6.2.1",
+]
diff --git a/src/megasniff/__pycache__/__init__.cpython-313.pyc b/src/megasniff/__pycache__/__init__.cpython-313.pyc
index ecf63c7..058ef70 100644
Binary files a/src/megasniff/__pycache__/__init__.cpython-313.pyc and b/src/megasniff/__pycache__/__init__.cpython-313.pyc differ
diff --git a/src/megasniff/__pycache__/utils.cpython-313.pyc b/src/megasniff/__pycache__/utils.cpython-313.pyc
index 05c8cab..57ac6b9 100644
Binary files a/src/megasniff/__pycache__/utils.cpython-313.pyc and b/src/megasniff/__pycache__/utils.cpython-313.pyc differ
diff --git a/src/megasniff/inflator.py b/src/megasniff/inflator.py
index b181f2e..3c3fbd8 100644
--- a/src/megasniff/inflator.py
+++ b/src/megasniff/inflator.py
@@ -19,6 +19,7 @@ class RenderData:
     typename: str
     is_union: bool
     is_optional: bool
+    allow_none: bool
     default_option: Optional[str]
 
 
@@ -56,13 +57,14 @@ class SchemaInflatorGenerator:
             has_default, default_option = get_field_default(schema, argname)
             argtypes = argtype,
             type_origin = get_origin(argtype)
+            allow_none = False
 
             if any(map(lambda x: type_origin is x, [Union, UnionType, Optional, Annotated])):
                 argtypes = get_args(argtype)
 
             if NoneType in argtypes or None in argtypes:
                 argtypes = tuple(filter(lambda x: x is not None and x is not NoneType, argtypes))
-                has_default = True
+                allow_none = True
 
             out_argtypes: list[tuple[str, bool]] = []
 
@@ -72,13 +74,23 @@ class SchemaInflatorGenerator:
                     if argt.__name__ not in lookup_table.keys():
                         # если случилась циклическая зависимость, мы не хотим бексконечную рекурсию
                         lookup_table[argt.__name__] = self.schema_to_generator(argt, _base_lookup_table=lookup_table)
+
                 if argt is schema:
                     out_argtypes.append(('inflate', True))
                 else:
                     out_argtypes.append((argt.__name__, is_builtin))
 
             render_data.append(
-                RenderData(argname, out_argtypes, repr(argtype), len(argtypes) > 1, has_default, default_option))
+                RenderData(
+                    argname,
+                    out_argtypes,
+                    repr(argtype),
+                    len(argtypes) > 1,
+                    has_default,
+                    allow_none,
+                    default_option
+                )
+            )
 
         convertor_functext = self.template.render(conversions=render_data)
         convertor_functext = '\n'.join(list(filter(lambda x: len(x.strip()), convertor_functext.split('\n'))))
@@ -88,6 +100,7 @@ class SchemaInflatorGenerator:
             '_lookup_table': lookup_table
         }
         exec(convertor_functext, namespace)
+        print(convertor_functext)
 
         # пихаем сгенеренный метод в табличку,
         # ожидаем что она обновится во всех вложенных методах,
diff --git a/src/megasniff/templates/inflator.jinja2 b/src/megasniff/templates/inflator.jinja2
index 62feaf8..b3ac531 100644
--- a/src/megasniff/templates/inflator.jinja2
+++ b/src/megasniff/templates/inflator.jinja2
@@ -1,7 +1,7 @@
 {% set ns = namespace(retry_indent=0) %}
 from typing import Any
 def inflate(from_data: dict[str, Any]):
-    from_data_keys = set(from_data.keys())
+    from_data_keys = from_data.keys()
 
     {% for conv in conversions %}
     {% if not conv.is_optional or conv.default_option is not none%}
@@ -16,41 +16,50 @@ def inflate(from_data: dict[str, Any]):
     {%endfor%}
 
     {% for conv in conversions %}
-    {% if conv.is_union %}
-    {% set ns.retry_indent = 0 %}
-    {% for union_type, is_builtin in conv.constrs %}
-    {{ '    ' * ns.retry_indent }}try:
-    {% if is_builtin %}
-    {{ '    ' * ns.retry_indent }}    {{conv.argname}} = {{union_type}}(from_data['{{conv.argname}}'])
+    conv_data = from_data['{{conv.argname}}']
+    if conv_data is None:
+    {% if not conv.allow_none %}
+        raise ValueError(f"Field {{conv.argname}} required type {{conv.typename | replace('"', "'")}}, null provided")
     {% else %}
-    {{ '    ' * ns.retry_indent }}    {{conv.argname}} = _lookup_table['{{union_type}}'](from_data['{{conv.argname}}'])
-    {% endif %}
-    {{ '    ' * ns.retry_indent }}except Exception as e:
-    {% set ns.retry_indent = ns.retry_indent + 1 %}
-    {% endfor %}
-    {{ '    ' * ns.retry_indent }}    raise e from e
-    {% else %}
-
-    {% if conv.constrs[0][1] %}
-    {% if conv.is_optional %}
-    if '{{conv.argname}}' not in from_data_keys:
         {{conv.argname}} = None
+    {% endif %}
     else:
-        {{conv.argname}} = {{conv.constrs[0][0]}}(from_data['{{conv.argname}}'])
-    {% else %}
-    {{conv.argname}} = {{conv.constrs[0][0]}}(from_data['{{conv.argname}}'])
-    {% endif %}
-    {% else %}
-    {% if conv.is_optional %}
-    if '{{conv.argname}}' not in from_data_keys:
-        {{conv.argname}} = None
-    else:
-        {{conv.argname}} = _lookup_table['{{conv.constrs[0][0]}}'](from_data['{{conv.argname}}'])
-    {% else %}
-    {{conv.argname}} = _lookup_table['{{conv.constrs[0][0]}}'](from_data['{{conv.argname}}'])
-    {% endif %}
-    {% endif %}
 
-    {% endif %}
+        {% if conv.is_union %}
+        {% set ns.retry_indent = 0 %}
+        {% for union_type, is_builtin in conv.constrs %}
+        {{ '    ' * ns.retry_indent }}try:
+        {% if is_builtin %}
+        {{ '    ' * ns.retry_indent }}    {{conv.argname}} = {{union_type}}(conv_data)
+        {% else %}
+        {{ '    ' * ns.retry_indent }}    {{conv.argname}} = _lookup_table['{{union_type}}'](conv_data)
+        {% endif %}
+        {{ '    ' * ns.retry_indent }}except Exception as e:
+        {% set ns.retry_indent = ns.retry_indent + 1 %}
+        {% endfor %}
+        {{ '    ' * ns.retry_indent }}    raise e from e
+        {% else %}
+
+        {% if conv.constrs[0][1] %}
+        {% if conv.is_optional %}
+        if '{{conv.argname}}' not in from_data_keys:
+            {{conv.argname}} = None
+        else:
+            {{conv.argname}} = {{conv.constrs[0][0]}}(conv_data)
+        {% else %}
+        {{conv.argname}} = {{conv.constrs[0][0]}}(conv_data)
+        {% endif %}
+        {% else %}
+        {% if conv.is_optional %}
+        if '{{conv.argname}}' not in from_data_keys:
+            {{conv.argname}} = None
+        else:
+            {{conv.argname}} = _lookup_table['{{conv.constrs[0][0]}}'](conv_data)
+        {% else %}
+        {{conv.argname}} = _lookup_table['{{conv.constrs[0][0]}}'](conv_data)
+        {% endif %}
+        {% endif %}
+
+        {% endif %}
     {% endfor %}
     return _tgt_type({% for conv in conversions %}{{conv.argname}}={{conv.argname}}, {% endfor %})
diff --git a/tests/test_basic.py b/tests/test_basic.py
new file mode 100644
index 0000000..61eff88
--- /dev/null
+++ b/tests/test_basic.py
@@ -0,0 +1,34 @@
+from __future__ import annotations
+from dataclasses import dataclass
+
+from src.megasniff import SchemaInflatorGenerator
+
+
+def test_basic_constructor():
+    class A:
+        def __init__(self, a: int):
+            self.a = a
+
+    infl = SchemaInflatorGenerator()
+    fn = infl.schema_to_generator(A)
+    a = fn({'a': 42})
+
+    assert a.a == 42
+
+
+@dataclass
+class CircA:
+    b: CircB
+
+
+@dataclass
+class CircB:
+    a: CircA | None
+
+
+def test_circular():
+    infl = SchemaInflatorGenerator()
+    fn = infl.schema_to_generator(CircA)
+    a = fn({'b': {'a': None}})
+
+    return isinstance(a.b, CircB)
diff --git a/uv.lock b/uv.lock
index 2d062f7..6fc8a33 100644
--- a/uv.lock
+++ b/uv.lock
@@ -2,6 +2,46 @@ version = 1
 revision = 2
 requires-python = ">=3.13"
 
+[[package]]
+name = "colorama"
+version = "0.4.6"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/d8/53/6f443c9a4a8358a93a6792e2acffb9d9d5cb0a5cfd8802644b7b1c9a02e4/colorama-0.4.6.tar.gz", hash = "sha256:08695f5cb7ed6e0531a20572697297273c47b8cae5a63ffc6d6ed5c201be6e44", size = 27697, upload-time = "2022-10-25T02:36:22.414Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/d1/d6/3965ed04c63042e047cb6a3e6ed1a63a35087b6a609aa3a15ed8ac56c221/colorama-0.4.6-py2.py3-none-any.whl", hash = "sha256:4f1d9991f5acc0ca119f9d443620b77f9d6b33703e51011c16baf57afb285fc6", size = 25335, upload-time = "2022-10-25T02:36:20.889Z" },
+]
+
+[[package]]
+name = "coverage"
+version = "7.9.2"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/04/b7/c0465ca253df10a9e8dae0692a4ae6e9726d245390aaef92360e1d6d3832/coverage-7.9.2.tar.gz", hash = "sha256:997024fa51e3290264ffd7492ec97d0690293ccd2b45a6cd7d82d945a4a80c8b", size = 813556, upload-time = "2025-07-03T10:54:15.101Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/94/9d/7a8edf7acbcaa5e5c489a646226bed9591ee1c5e6a84733c0140e9ce1ae1/coverage-7.9.2-cp313-cp313-macosx_10_13_x86_64.whl", hash = "sha256:985abe7f242e0d7bba228ab01070fde1d6c8fa12f142e43debe9ed1dde686038", size = 212367, upload-time = "2025-07-03T10:53:25.811Z" },
+    { url = "https://files.pythonhosted.org/packages/e8/9e/5cd6f130150712301f7e40fb5865c1bc27b97689ec57297e568d972eec3c/coverage-7.9.2-cp313-cp313-macosx_11_0_arm64.whl", hash = "sha256:82c3939264a76d44fde7f213924021ed31f55ef28111a19649fec90c0f109e6d", size = 212632, upload-time = "2025-07-03T10:53:27.075Z" },
+    { url = "https://files.pythonhosted.org/packages/a8/de/6287a2c2036f9fd991c61cefa8c64e57390e30c894ad3aa52fac4c1e14a8/coverage-7.9.2-cp313-cp313-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:ae5d563e970dbe04382f736ec214ef48103d1b875967c89d83c6e3f21706d5b3", size = 245793, upload-time = "2025-07-03T10:53:28.408Z" },
+    { url = "https://files.pythonhosted.org/packages/06/cc/9b5a9961d8160e3cb0b558c71f8051fe08aa2dd4b502ee937225da564ed1/coverage-7.9.2-cp313-cp313-manylinux_2_5_i686.manylinux1_i686.manylinux_2_17_i686.manylinux2014_i686.whl", hash = "sha256:bdd612e59baed2a93c8843c9a7cb902260f181370f1d772f4842987535071d14", size = 243006, upload-time = "2025-07-03T10:53:29.754Z" },
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+    { url = "https://files.pythonhosted.org/packages/8c/32/37dd1c42ce3016ff8ec9e4b607650d2e34845c0585d3518b2a93b4830c1a/coverage-7.9.2-cp313-cp313t-musllinux_1_2_x86_64.whl", hash = "sha256:c33624f50cf8de418ab2b4d6ca9eda96dc45b2c4231336bac91454520e8d1fac", size = 255099, upload-time = "2025-07-03T10:53:51.354Z" },
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+    { url = "https://files.pythonhosted.org/packages/1d/a0/a6bffb5e0f41a47279fd45a8f3155bf193f77990ae1c30f9c224b61cacb0/coverage-7.9.2-cp313-cp313t-win_arm64.whl", hash = "sha256:c48c2375287108c887ee87d13b4070a381c6537d30e8487b24ec721bf2a781cb", size = 214398, upload-time = "2025-07-03T10:53:56.715Z" },
+    { url = "https://files.pythonhosted.org/packages/3c/38/bbe2e63902847cf79036ecc75550d0698af31c91c7575352eb25190d0fb3/coverage-7.9.2-py3-none-any.whl", hash = "sha256:e425cd5b00f6fc0ed7cdbd766c70be8baab4b7839e4d4fe5fac48581dd968ea4", size = 204005, upload-time = "2025-07-03T10:54:13.491Z" },
+]
+
 [[package]]
 name = "hatchling"
 version = "1.27.0"
@@ -17,6 +57,15 @@ wheels = [
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 ]
 
+[[package]]
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+version = "2.1.0"
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+]
+
 [[package]]
 name = "jinja2"
 version = "3.1.6"
@@ -59,19 +108,31 @@ wheels = [
 
 [[package]]
 name = "megasniff"
-version = "0.1.0"
+version = "0.1.2"
 source = { editable = "." }
 dependencies = [
     { name = "hatchling" },
     { name = "jinja2" },
 ]
 
+[package.dev-dependencies]
+dev = [
+    { name = "pytest" },
+    { name = "pytest-cov" },
+]
+
 [package.metadata]
 requires-dist = [
     { name = "hatchling", specifier = ">=1.27.0" },
     { name = "jinja2", specifier = ">=3.1.6" },
 ]
 
+[package.metadata.requires-dev]
+dev = [
+    { name = "pytest", specifier = ">=8.4.1" },
+    { name = "pytest-cov", specifier = ">=6.2.1" },
+]
+
 [[package]]
 name = "packaging"
 version = "25.0"
@@ -99,6 +160,45 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/54/20/4d324d65cc6d9205fabedc306948156824eb9f0ee1633355a8f7ec5c66bf/pluggy-1.6.0-py3-none-any.whl", hash = "sha256:e920276dd6813095e9377c0bc5566d94c932c33b27a3e3945d8389c374dd4746", size = 20538, upload-time = "2025-05-15T12:30:06.134Z" },
 ]
 
+[[package]]
+name = "pygments"
+version = "2.19.2"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/b0/77/a5b8c569bf593b0140bde72ea885a803b82086995367bf2037de0159d924/pygments-2.19.2.tar.gz", hash = "sha256:636cb2477cec7f8952536970bc533bc43743542f70392ae026374600add5b887", size = 4968631, upload-time = "2025-06-21T13:39:12.283Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/c7/21/705964c7812476f378728bdf590ca4b771ec72385c533964653c68e86bdc/pygments-2.19.2-py3-none-any.whl", hash = "sha256:86540386c03d588bb81d44bc3928634ff26449851e99741617ecb9037ee5ec0b", size = 1225217, upload-time = "2025-06-21T13:39:07.939Z" },
+]
+
+[[package]]
+name = "pytest"
+version = "8.4.1"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "colorama", marker = "sys_platform == 'win32'" },
+    { name = "iniconfig" },
+    { name = "packaging" },
+    { name = "pluggy" },
+    { name = "pygments" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/08/ba/45911d754e8eba3d5a841a5ce61a65a685ff1798421ac054f85aa8747dfb/pytest-8.4.1.tar.gz", hash = "sha256:7c67fd69174877359ed9371ec3af8a3d2b04741818c51e5e99cc1742251fa93c", size = 1517714, upload-time = "2025-06-18T05:48:06.109Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/29/16/c8a903f4c4dffe7a12843191437d7cd8e32751d5de349d45d3fe69544e87/pytest-8.4.1-py3-none-any.whl", hash = "sha256:539c70ba6fcead8e78eebbf1115e8b589e7565830d7d006a8723f19ac8a0afb7", size = 365474, upload-time = "2025-06-18T05:48:03.955Z" },
+]
+
+[[package]]
+name = "pytest-cov"
+version = "6.2.1"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "coverage" },
+    { name = "pluggy" },
+    { name = "pytest" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/18/99/668cade231f434aaa59bbfbf49469068d2ddd945000621d3d165d2e7dd7b/pytest_cov-6.2.1.tar.gz", hash = "sha256:25cc6cc0a5358204b8108ecedc51a9b57b34cc6b8c967cc2c01a4e00d8a67da2", size = 69432, upload-time = "2025-06-12T10:47:47.684Z" }
+wheels = [
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+]
+
 [[package]]
 name = "trove-classifiers"
 version = "2025.5.9.12"