diff --git a/openapi_core/validation/models.py b/openapi_core/validation/datatypes.py
similarity index 54%
rename from openapi_core/validation/models.py
rename to openapi_core/validation/datatypes.py
index e6366bb..0bf8676 100644
--- a/openapi_core/validation/models.py
+++ b/openapi_core/validation/datatypes.py
@@ -1,10 +1,10 @@
-"""OpenAPI core validation models module"""
+"""OpenAPI core validation datatypes module"""
+import attr
 
 
+@attr.s
 class BaseValidationResult(object):
-
-    def __init__(self, errors):
-        self.errors = errors
+    errors = attr.ib(factory=list)
 
     def raise_for_errors(self):
         for error in self.errors:
diff --git a/openapi_core/validation/request/datatypes.py b/openapi_core/validation/request/datatypes.py
new file mode 100644
index 0000000..2e5b8ea
--- /dev/null
+++ b/openapi_core/validation/request/datatypes.py
@@ -0,0 +1,21 @@
+"""OpenAPI core validation request datatypes module"""
+import attr
+
+from openapi_core.validation.datatypes import BaseValidationResult
+
+
+@attr.s
+class RequestParameters(object):
+    path = attr.ib(factory=dict)
+    query = attr.ib(factory=dict)
+    header = attr.ib(factory=dict)
+    cookie = attr.ib(factory=dict)
+
+    def __getitem__(self, location):
+        return getattr(self, location)
+
+
+@attr.s
+class RequestValidationResult(BaseValidationResult):
+    body = attr.ib(default=None)
+    parameters = attr.ib(factory=RequestParameters)
diff --git a/openapi_core/validation/request/models.py b/openapi_core/validation/request/models.py
deleted file mode 100644
index 85ebc11..0000000
--- a/openapi_core/validation/request/models.py
+++ /dev/null
@@ -1,41 +0,0 @@
-"""OpenAPI core validation request models module"""
-from openapi_core.schema.exceptions import OpenAPIMappingError
-
-from openapi_core.validation.models import BaseValidationResult
-
-
-class RequestParameters(dict):
-
-    valid_locations = ['path', 'query', 'header', 'cookie']
-
-    def __getitem__(self, location):
-        self.validate_location(location)
-
-        return self.setdefault(location, {})
-
-    def __setitem__(self, location, value):
-        raise NotImplementedError
-
-    def __add__(self, other):
-        if not isinstance(other, self.__class__):
-            raise ValueError("Invalid type")
-
-        for location in self.valid_locations:
-            if location in other:
-                self[location].update(other[location])
-
-        return self    
-
-    @classmethod
-    def validate_location(cls, location):
-        if location not in cls.valid_locations:
-            raise OpenAPIMappingError(
-                "Unknown parameter location: {0}".format(str(location)))
-
-
-class RequestValidationResult(BaseValidationResult):
-
-    def __init__(self, errors, body=None, parameters=None):
-        super(RequestValidationResult, self).__init__(errors)
-        self.body = body
-        self.parameters = parameters or RequestParameters()
diff --git a/openapi_core/validation/request/validators.py b/openapi_core/validation/request/validators.py
index ba4851e..a6d8e78 100644
--- a/openapi_core/validation/request/validators.py
+++ b/openapi_core/validation/request/validators.py
@@ -4,7 +4,7 @@ from six import iteritems
 
 from openapi_core.schema.exceptions import OpenAPIMappingError
 from openapi_core.schema.parameters.exceptions import MissingParameter
-from openapi_core.validation.request.models import (
+from openapi_core.validation.request.datatypes import (
     RequestParameters, RequestValidationResult,
 )
 from openapi_core.validation.util import get_operation_pattern
diff --git a/openapi_core/validation/response/datatypes.py b/openapi_core/validation/response/datatypes.py
new file mode 100644
index 0000000..38cfb07
--- /dev/null
+++ b/openapi_core/validation/response/datatypes.py
@@ -0,0 +1,10 @@
+"""OpenAPI core validation response datatypes module"""
+import attr
+
+from openapi_core.validation.datatypes import BaseValidationResult
+
+
+@attr.s
+class ResponseValidationResult(BaseValidationResult):
+    data = attr.ib(default=None)
+    headers = attr.ib(factory=dict)
diff --git a/openapi_core/validation/response/models.py b/openapi_core/validation/response/models.py
deleted file mode 100644
index 1a735c6..0000000
--- a/openapi_core/validation/response/models.py
+++ /dev/null
@@ -1,10 +0,0 @@
-"""OpenAPI core validation response models module"""
-from openapi_core.validation.models import BaseValidationResult
-
-
-class ResponseValidationResult(BaseValidationResult):
-
-    def __init__(self, errors, data=None, headers=None):
-        super(ResponseValidationResult, self).__init__(errors)
-        self.data = data
-        self.headers = headers
diff --git a/openapi_core/validation/response/validators.py b/openapi_core/validation/response/validators.py
index 2ed923a..341b294 100644
--- a/openapi_core/validation/response/validators.py
+++ b/openapi_core/validation/response/validators.py
@@ -1,6 +1,6 @@
 """OpenAPI core validation response validators module"""
 from openapi_core.schema.exceptions import OpenAPIMappingError
-from openapi_core.validation.response.models import ResponseValidationResult
+from openapi_core.validation.response.datatypes import ResponseValidationResult
 from openapi_core.validation.util import get_operation_pattern
 
 
diff --git a/tests/integration/test_empty.py b/tests/integration/schema/test_empty.py
similarity index 100%
rename from tests/integration/test_empty.py
rename to tests/integration/schema/test_empty.py
diff --git a/tests/integration/test_link_spec.py b/tests/integration/schema/test_link_spec.py
similarity index 100%
rename from tests/integration/test_link_spec.py
rename to tests/integration/schema/test_link_spec.py
diff --git a/tests/integration/test_path_params.py b/tests/integration/schema/test_path_params.py
similarity index 100%
rename from tests/integration/test_path_params.py
rename to tests/integration/schema/test_path_params.py
diff --git a/tests/integration/schema/test_spec.py b/tests/integration/schema/test_spec.py
new file mode 100644
index 0000000..9ad67c9
--- /dev/null
+++ b/tests/integration/schema/test_spec.py
@@ -0,0 +1,191 @@
+import pytest
+from base64 import b64encode
+from six import iteritems, text_type
+
+from openapi_core.schema.media_types.models import MediaType
+from openapi_core.schema.operations.models import Operation
+from openapi_core.schema.parameters.models import Parameter
+from openapi_core.schema.paths.models import Path
+from openapi_core.schema.request_bodies.models import RequestBody
+from openapi_core.schema.responses.models import Response
+from openapi_core.schema.schemas.models import Schema
+from openapi_core.schema.servers.models import Server, ServerVariable
+from openapi_core.shortcuts import create_spec
+from openapi_core.validation.request.validators import RequestValidator
+from openapi_core.validation.response.validators import ResponseValidator
+
+
+class TestPetstore(object):
+
+    api_key = '12345'
+
+    @property
+    def api_key_encoded(self):
+        api_key_bytes = self.api_key.encode('utf8')
+        api_key_bytes_enc = b64encode(api_key_bytes)
+        return text_type(api_key_bytes_enc, 'utf8')
+
+    @pytest.fixture
+    def spec_uri(self):
+        return "file://tests/integration/data/v3.0/petstore.yaml"
+
+    @pytest.fixture
+    def spec_dict(self, factory):
+        return factory.spec_from_file("data/v3.0/petstore.yaml")
+
+    @pytest.fixture
+    def spec(self, spec_dict, spec_uri):
+        return create_spec(spec_dict, spec_uri)
+
+    @pytest.fixture
+    def request_validator(self, spec):
+        return RequestValidator(spec)
+
+    @pytest.fixture
+    def response_validator(self, spec):
+        return ResponseValidator(spec)
+
+    def test_spec(self, spec, spec_dict):
+        url = 'http://petstore.swagger.io/v1'
+        assert spec.info.title == spec_dict['info']['title']
+        assert spec.info.version == spec_dict['info']['version']
+
+        assert spec.get_server_url() == url
+
+        for idx, server in enumerate(spec.servers):
+            assert type(server) == Server
+
+            server_spec = spec_dict['servers'][idx]
+            assert server.url == server_spec['url']
+            assert server.default_url == url
+
+            for variable_name, variable in iteritems(server.variables):
+                assert type(variable) == ServerVariable
+                assert variable.name == variable_name
+
+                variable_spec = server_spec['variables'][variable_name]
+                assert variable.default == variable_spec['default']
+                assert variable.enum == variable_spec.get('enum')
+
+        for path_name, path in iteritems(spec.paths):
+            assert type(path) == Path
+            assert path.name == path_name
+
+            for http_method, operation in iteritems(path.operations):
+                operation_spec = spec_dict['paths'][path_name][http_method]
+
+                assert type(operation) == Operation
+                assert operation.path_name == path_name
+                assert operation.http_method == http_method
+                assert operation.operation_id is not None
+                assert operation.tags == operation_spec['tags']
+
+                responses_spec = operation_spec.get('responses')
+
+                for http_status, response in iteritems(operation.responses):
+                    assert type(response) == Response
+                    assert response.http_status == http_status
+
+                    response_spec = responses_spec[http_status]
+
+                    if not response_spec:
+                        continue
+
+                    # @todo: test with defererence
+                    if '$ref' in response_spec:
+                        continue
+
+                    description_spec = response_spec['description']
+
+                    assert response.description == description_spec
+
+                    for mimetype, media_type in iteritems(response.content):
+                        assert type(media_type) == MediaType
+                        assert media_type.mimetype == mimetype
+
+                        content_spec = response_spec['content'][mimetype]
+
+                        example_spec = content_spec.get('example')
+                        assert media_type.example == example_spec
+
+                        schema_spec = content_spec.get('schema')
+                        assert bool(schema_spec) == bool(media_type.schema)
+
+                        if not schema_spec:
+                            continue
+
+                        # @todo: test with defererence
+                        if '$ref' in schema_spec:
+                            continue
+
+                        assert type(media_type.schema) == Schema
+                        assert media_type.schema.type.value ==\
+                            schema_spec['type']
+                        assert media_type.schema.required == schema_spec.get(
+                            'required', [])
+
+                    for parameter_name, parameter in iteritems(
+                            response.headers):
+                        assert type(parameter) == Parameter
+                        assert parameter.name == parameter_name
+
+                        headers_spec = response_spec['headers']
+                        parameter_spec = headers_spec[parameter_name]
+                        schema_spec = parameter_spec.get('schema')
+                        assert bool(schema_spec) == bool(parameter.schema)
+
+                        if not schema_spec:
+                            continue
+
+                        # @todo: test with defererence
+                        if '$ref' in schema_spec:
+                            continue
+
+                        assert type(parameter.schema) == Schema
+                        assert parameter.schema.type.value ==\
+                            schema_spec['type']
+                        assert parameter.schema.format ==\
+                            schema_spec.get('format')
+                        assert parameter.schema.required == schema_spec.get(
+                            'required', [])
+
+                request_body_spec = operation_spec.get('requestBody')
+
+                assert bool(request_body_spec) == bool(operation.request_body)
+
+                if not request_body_spec:
+                    continue
+
+                assert type(operation.request_body) == RequestBody
+                assert bool(operation.request_body.required) ==\
+                    request_body_spec.get('required', False)
+
+                for mimetype, media_type in iteritems(
+                        operation.request_body.content):
+                    assert type(media_type) == MediaType
+                    assert media_type.mimetype == mimetype
+
+                    content_spec = request_body_spec['content'][mimetype]
+                    schema_spec = content_spec.get('schema')
+                    assert bool(schema_spec) == bool(media_type.schema)
+
+                    if not schema_spec:
+                        continue
+
+                    # @todo: test with defererence
+                    if '$ref' in schema_spec:
+                        continue
+
+                    assert type(media_type.schema) == Schema
+                    assert media_type.schema.type.value ==\
+                        schema_spec['type']
+                    assert media_type.schema.format ==\
+                        schema_spec.get('format')
+                    assert media_type.schema.required == schema_spec.get(
+                        'required', False)
+
+        if not spec.components:
+            return
+
+        for _, schema in iteritems(spec.components.schemas):
+            assert type(schema) == Schema
diff --git a/tests/integration/test_minimal.py b/tests/integration/validation/test_minimal.py
similarity index 96%
rename from tests/integration/test_minimal.py
rename to tests/integration/validation/test_minimal.py
index a307985..936c27b 100644
--- a/tests/integration/test_minimal.py
+++ b/tests/integration/validation/test_minimal.py
@@ -47,7 +47,7 @@ class TestMinimal(object):
         assert len(result.errors) == 1
         assert isinstance(result.errors[0], InvalidOperation)
         assert result.body is None
-        assert result.parameters == {}
+        assert result.parameters is None
 
     @pytest.mark.parametrize("server", servers)
     @pytest.mark.parametrize("spec_path", spec_paths)
@@ -62,4 +62,4 @@ class TestMinimal(object):
         assert len(result.errors) == 1
         assert isinstance(result.errors[0], InvalidPath)
         assert result.body is None
-        assert result.parameters == {}
+        assert result.parameters is None
diff --git a/tests/integration/test_petstore.py b/tests/integration/validation/test_petstore.py
similarity index 80%
rename from tests/integration/test_petstore.py
rename to tests/integration/validation/test_petstore.py
index 5e57c5e..b07f7f0 100644
--- a/tests/integration/test_petstore.py
+++ b/tests/integration/validation/test_petstore.py
@@ -3,27 +3,20 @@ import pytest
 from datetime import datetime
 from base64 import b64encode
 from uuid import UUID
-from six import iteritems, text_type
+from six import text_type
 
 from openapi_core.extensions.models.models import BaseModel
 from openapi_core.schema.media_types.exceptions import (
     InvalidContentType, InvalidMediaTypeValue,
 )
-from openapi_core.schema.media_types.models import MediaType
-from openapi_core.schema.operations.models import Operation
 from openapi_core.schema.parameters.exceptions import (
     MissingRequiredParameter, InvalidParameterValue, EmptyParameterValue,
 )
-from openapi_core.schema.parameters.models import Parameter
-from openapi_core.schema.paths.models import Path
-from openapi_core.schema.request_bodies.models import RequestBody
-from openapi_core.schema.responses.models import Response
 from openapi_core.schema.schemas.enums import SchemaType
 from openapi_core.schema.schemas.exceptions import InvalidSchemaValue
-from openapi_core.schema.schemas.models import Schema
 from openapi_core.schema.servers.exceptions import InvalidServer
-from openapi_core.schema.servers.models import Server, ServerVariable
 from openapi_core.shortcuts import create_spec
+from openapi_core.validation.request.datatypes import RequestParameters
 from openapi_core.validation.request.validators import RequestValidator
 from openapi_core.validation.response.validators import ResponseValidator
 from openapi_core.wrappers.mock import MockRequest, MockResponse
@@ -59,151 +52,6 @@ class TestPetstore(object):
     def response_validator(self, spec):
         return ResponseValidator(spec)
 
-    def test_spec(self, spec, spec_dict):
-        url = 'http://petstore.swagger.io/v1'
-        assert spec.info.title == spec_dict['info']['title']
-        assert spec.info.version == spec_dict['info']['version']
-
-        assert spec.get_server_url() == url
-
-        for idx, server in enumerate(spec.servers):
-            assert type(server) == Server
-
-            server_spec = spec_dict['servers'][idx]
-            assert server.url == server_spec['url']
-            assert server.default_url == url
-
-            for variable_name, variable in iteritems(server.variables):
-                assert type(variable) == ServerVariable
-                assert variable.name == variable_name
-
-                variable_spec = server_spec['variables'][variable_name]
-                assert variable.default == variable_spec['default']
-                assert variable.enum == variable_spec.get('enum')
-
-        for path_name, path in iteritems(spec.paths):
-            assert type(path) == Path
-            assert path.name == path_name
-
-            for http_method, operation in iteritems(path.operations):
-                operation_spec = spec_dict['paths'][path_name][http_method]
-
-                assert type(operation) == Operation
-                assert operation.path_name == path_name
-                assert operation.http_method == http_method
-                assert operation.operation_id is not None
-                assert operation.tags == operation_spec['tags']
-
-                responses_spec = operation_spec.get('responses')
-
-                for http_status, response in iteritems(operation.responses):
-                    assert type(response) == Response
-                    assert response.http_status == http_status
-
-                    response_spec = responses_spec[http_status]
-
-                    if not response_spec:
-                        continue
-
-                    # @todo: test with defererence
-                    if '$ref' in response_spec:
-                        continue
-
-                    description_spec = response_spec['description']
-
-                    assert response.description == description_spec
-
-                    for mimetype, media_type in iteritems(response.content):
-                        assert type(media_type) == MediaType
-                        assert media_type.mimetype == mimetype
-
-                        content_spec = response_spec['content'][mimetype]
-
-                        example_spec = content_spec.get('example')
-                        assert media_type.example == example_spec
-
-                        schema_spec = content_spec.get('schema')
-                        assert bool(schema_spec) == bool(media_type.schema)
-
-                        if not schema_spec:
-                            continue
-
-                        # @todo: test with defererence
-                        if '$ref' in schema_spec:
-                            continue
-
-                        assert type(media_type.schema) == Schema
-                        assert media_type.schema.type.value ==\
-                            schema_spec['type']
-                        assert media_type.schema.required == schema_spec.get(
-                            'required', [])
-
-                    for parameter_name, parameter in iteritems(
-                            response.headers):
-                        assert type(parameter) == Parameter
-                        assert parameter.name == parameter_name
-
-                        headers_spec = response_spec['headers']
-                        parameter_spec = headers_spec[parameter_name]
-                        schema_spec = parameter_spec.get('schema')
-                        assert bool(schema_spec) == bool(parameter.schema)
-
-                        if not schema_spec:
-                            continue
-
-                        # @todo: test with defererence
-                        if '$ref' in schema_spec:
-                            continue
-
-                        assert type(parameter.schema) == Schema
-                        assert parameter.schema.type.value ==\
-                            schema_spec['type']
-                        assert parameter.schema.format ==\
-                            schema_spec.get('format')
-                        assert parameter.schema.required == schema_spec.get(
-                            'required', [])
-
-                request_body_spec = operation_spec.get('requestBody')
-
-                assert bool(request_body_spec) == bool(operation.request_body)
-
-                if not request_body_spec:
-                    continue
-
-                assert type(operation.request_body) == RequestBody
-                assert bool(operation.request_body.required) ==\
-                    request_body_spec.get('required', False)
-
-                for mimetype, media_type in iteritems(
-                        operation.request_body.content):
-                    assert type(media_type) == MediaType
-                    assert media_type.mimetype == mimetype
-
-                    content_spec = request_body_spec['content'][mimetype]
-                    schema_spec = content_spec.get('schema')
-                    assert bool(schema_spec) == bool(media_type.schema)
-
-                    if not schema_spec:
-                        continue
-
-                    # @todo: test with defererence
-                    if '$ref' in schema_spec:
-                        continue
-
-                    assert type(media_type.schema) == Schema
-                    assert media_type.schema.type.value ==\
-                        schema_spec['type']
-                    assert media_type.schema.format ==\
-                        schema_spec.get('format')
-                    assert media_type.schema.required == schema_spec.get(
-                        'required', False)
-
-        if not spec.components:
-            return
-
-        for schema_name, schema in iteritems(spec.components.schemas):
-            assert type(schema) == Schema
-
     def test_get_pets(self, spec, response_validator):
         host_url = 'http://petstore.swagger.io/v1'
         path_pattern = '/v1/pets'
@@ -219,13 +67,13 @@ class TestPetstore(object):
         parameters = request.get_parameters(spec)
         body = request.get_body(spec)
 
-        assert parameters == {
-            'query': {
+        assert parameters == RequestParameters(
+            query={
                 'limit': 20,
                 'page': 1,
                 'search': '',
             }
-        }
+        )
         assert body is None
 
         data_json = {
@@ -255,13 +103,13 @@ class TestPetstore(object):
         parameters = request.get_parameters(spec)
         body = request.get_body(spec)
 
-        assert parameters == {
-            'query': {
+        assert parameters == RequestParameters(
+            query={
                 'limit': 20,
                 'page': 1,
                 'search': '',
             }
-        }
+        )
         assert body is None
 
         data_json = {
@@ -301,13 +149,13 @@ class TestPetstore(object):
         parameters = request.get_parameters(spec)
         body = request.get_body(spec)
 
-        assert parameters == {
-            'query': {
+        assert parameters == RequestParameters(
+            query={
                 'limit': 20,
                 'page': 1,
                 'search': '',
             }
-        }
+        )
         assert body is None
 
         data_json = {
@@ -352,14 +200,14 @@ class TestPetstore(object):
         parameters = request.get_parameters(spec)
         body = request.get_body(spec)
 
-        assert parameters == {
-            'query': {
+        assert parameters == RequestParameters(
+            query={
                 'limit': 20,
                 'page': 1,
                 'search': '',
                 'ids': [12, 13],
             }
-        }
+        )
         assert body is None
 
         data_json = {
@@ -390,14 +238,14 @@ class TestPetstore(object):
         parameters = request.get_parameters(spec)
         body = request.get_body(spec)
 
-        assert parameters == {
-            'query': {
+        assert parameters == RequestParameters(
+            query={
                 'limit': 20,
                 'page': 1,
                 'search': '',
                 'tags': ['cats', 'dogs'],
             }
-        }
+        )
         assert body is None
 
         data_json = {
@@ -498,13 +346,13 @@ class TestPetstore(object):
 
         parameters = request.get_parameters(spec)
 
-        assert parameters == {
-            'query': {
+        assert parameters == RequestParameters(
+            query={
                 'limit': None,
                 'page': 1,
                 'search': '',
             }
-        }
+        )
 
         body = request.get_body(spec)
 
@@ -547,14 +395,14 @@ class TestPetstore(object):
 
         parameters = request.get_parameters(spec)
 
-        assert parameters == {
-            'header': {
+        assert parameters == RequestParameters(
+            header={
                 'api_key': self.api_key,
             },
-            'cookie': {
+            cookie={
                 'user': 123,
             },
-        }
+        )
 
         body = request.get_body(spec)
 
@@ -607,14 +455,14 @@ class TestPetstore(object):
 
         parameters = request.get_parameters(spec)
 
-        assert parameters == {
-            'header': {
+        assert parameters == RequestParameters(
+            header={
                 'api_key': self.api_key,
             },
-            'cookie': {
+            cookie={
                 'user': 123,
             },
-        }
+        )
 
         body = request.get_body(spec)
 
@@ -667,14 +515,14 @@ class TestPetstore(object):
 
         parameters = request.get_parameters(spec)
 
-        assert parameters == {
-            'header': {
+        assert parameters == RequestParameters(
+            header={
                 'api_key': self.api_key,
             },
-            'cookie': {
+            cookie={
                 'user': 123,
             },
-        }
+        )
 
         body = request.get_body(spec)
 
@@ -715,14 +563,14 @@ class TestPetstore(object):
 
         parameters = request.get_parameters(spec)
 
-        assert parameters == {
-            'header': {
+        assert parameters == RequestParameters(
+            header={
                 'api_key': self.api_key,
             },
-            'cookie': {
+            cookie={
                 'user': 123,
             },
-        }
+        )
 
         with pytest.raises(InvalidMediaTypeValue):
             request.get_body(spec)
@@ -754,14 +602,14 @@ class TestPetstore(object):
 
         parameters = request.get_parameters(spec)
 
-        assert parameters == {
-            'header': {
+        assert parameters == RequestParameters(
+            header={
                 'api_key': self.api_key,
             },
-            'cookie': {
+            cookie={
                 'user': 123,
             },
-        }
+        )
 
         body = request.get_body(spec)
 
@@ -795,14 +643,14 @@ class TestPetstore(object):
 
         parameters = request.get_parameters(spec)
 
-        assert parameters == {
-            'header': {
+        assert parameters == RequestParameters(
+            header={
                 'api_key': self.api_key,
             },
-            'cookie': {
+            cookie={
                 'user': 123,
             },
-        }
+        )
 
         with pytest.raises(InvalidContentType):
             request.get_body(spec)
@@ -915,11 +763,11 @@ class TestPetstore(object):
 
         parameters = request.get_parameters(spec)
 
-        assert parameters == {
-            'path': {
+        assert parameters == RequestParameters(
+            path={
                 'petId': 1,
             }
-        }
+        )
 
         body = request.get_body(spec)
 
@@ -960,11 +808,11 @@ class TestPetstore(object):
 
         parameters = request.get_parameters(spec)
 
-        assert parameters == {
-            'path': {
+        assert parameters == RequestParameters(
+            path={
                 'petId': 1,
             }
-        }
+        )
 
         body = request.get_body(spec)
 
@@ -1002,11 +850,11 @@ class TestPetstore(object):
 
         parameters = request.get_parameters(spec)
 
-        assert parameters == {
-            'path': {
+        assert parameters == RequestParameters(
+            path={
                 'petId': 1,
             }
-        }
+        )
 
         body = request.get_body(spec)
 
@@ -1032,7 +880,7 @@ class TestPetstore(object):
         parameters = request.get_parameters(spec)
         body = request.get_body(spec)
 
-        assert parameters == {}
+        assert parameters == RequestParameters()
         assert body is None
 
         data_json = ['cats', 'birds']
@@ -1062,7 +910,7 @@ class TestPetstore(object):
 
         parameters = request.get_parameters(spec)
 
-        assert parameters == {}
+        assert parameters == RequestParameters()
 
         with pytest.raises(InvalidMediaTypeValue):
             request.get_body(spec)
@@ -1080,7 +928,7 @@ class TestPetstore(object):
 
         parameters = request.get_parameters(spec)
 
-        assert parameters == {}
+        assert parameters == RequestParameters()
 
         with pytest.raises(InvalidMediaTypeValue):
             request.get_body(spec)
@@ -1098,7 +946,7 @@ class TestPetstore(object):
 
         parameters = request.get_parameters(spec)
 
-        assert parameters == {}
+        assert parameters == RequestParameters()
 
         with pytest.raises(InvalidMediaTypeValue):
             request.get_body(spec)
@@ -1121,7 +969,7 @@ class TestPetstore(object):
         parameters = request.get_parameters(spec)
         body = request.get_body(spec)
 
-        assert parameters == {}
+        assert parameters == RequestParameters()
         assert isinstance(body, BaseModel)
         assert body.name == pet_name
 
@@ -1167,7 +1015,7 @@ class TestPetstore(object):
         parameters = request.get_parameters(spec)
         body = request.get_body(spec)
 
-        assert parameters == {}
+        assert parameters == RequestParameters()
         assert isinstance(body, BaseModel)
         assert body.created == created
         assert body.name == pet_name
@@ -1214,7 +1062,7 @@ class TestPetstore(object):
         parameters = request.get_parameters(spec)
         body = request.get_body(spec)
 
-        assert parameters == {}
+        assert parameters == RequestParameters()
         assert isinstance(body, BaseModel)
         assert body.created == datetime(2016, 4, 16, 16, 6, 5)
         assert body.name == pet_name
@@ -1262,7 +1110,7 @@ class TestPetstore(object):
         with pytest.raises(InvalidMediaTypeValue):
             request.get_body(spec)
 
-        assert parameters == {}
+        assert parameters == RequestParameters()
 
         code = 400
         message = 'Bad request'
diff --git a/tests/integration/test_validators.py b/tests/integration/validation/test_validators.py
similarity index 93%
rename from tests/integration/test_validators.py
rename to tests/integration/validation/test_validators.py
index 2d3af8f..c696cf1 100644
--- a/tests/integration/test_validators.py
+++ b/tests/integration/validation/test_validators.py
@@ -17,6 +17,7 @@ from openapi_core.schema.responses.exceptions import (
 )
 from openapi_core.schema.servers.exceptions import InvalidServer
 from openapi_core.shortcuts import create_spec
+from openapi_core.validation.request.datatypes import RequestParameters
 from openapi_core.validation.request.validators import RequestValidator
 from openapi_core.validation.response.validators import ResponseValidator
 from openapi_core.wrappers.mock import MockRequest, MockResponse
@@ -54,7 +55,7 @@ class TestRequestValidator(object):
         assert len(result.errors) == 1
         assert type(result.errors[0]) == InvalidServer
         assert result.body is None
-        assert result.parameters == {}
+        assert result.parameters is None
 
     def test_invalid_path(self, validator):
         request = MockRequest(self.host_url, 'get', '/v1')
@@ -64,7 +65,7 @@ class TestRequestValidator(object):
         assert len(result.errors) == 1
         assert type(result.errors[0]) == InvalidPath
         assert result.body is None
-        assert result.parameters == {}
+        assert result.parameters is None
 
     def test_invalid_operation(self, validator):
         request = MockRequest(self.host_url, 'patch', '/v1/pets')
@@ -74,7 +75,7 @@ class TestRequestValidator(object):
         assert len(result.errors) == 1
         assert type(result.errors[0]) == InvalidOperation
         assert result.body is None
-        assert result.parameters == {}
+        assert result.parameters is None
 
     def test_missing_parameter(self, validator):
         request = MockRequest(self.host_url, 'get', '/v1/pets')
@@ -83,12 +84,12 @@ class TestRequestValidator(object):
 
         assert type(result.errors[0]) == MissingRequiredParameter
         assert result.body is None
-        assert result.parameters == {
-            'query': {
+        assert result.parameters == RequestParameters(
+            query={
                 'page': 1,
                 'search': '',
             },
-        }
+        )
 
     def test_get_pets(self, validator):
         request = MockRequest(
@@ -100,13 +101,13 @@ class TestRequestValidator(object):
 
         assert result.errors == []
         assert result.body is None
-        assert result.parameters == {
-            'query': {
+        assert result.parameters == RequestParameters(
+            query={
                 'limit': 10,
                 'page': 1,
                 'search': '',
             },
-        }
+        )
 
     def test_missing_body(self, validator):
         headers = {
@@ -126,14 +127,14 @@ class TestRequestValidator(object):
         assert len(result.errors) == 1
         assert type(result.errors[0]) == MissingRequestBody
         assert result.body is None
-        assert result.parameters == {
-            'header': {
+        assert result.parameters == RequestParameters(
+            header={
                 'api_key': self.api_key,
             },
-            'cookie': {
+            cookie={
                 'user': 123,
             },
-        }
+        )
 
     def test_invalid_content_type(self, validator):
         headers = {
@@ -153,14 +154,14 @@ class TestRequestValidator(object):
         assert len(result.errors) == 1
         assert type(result.errors[0]) == InvalidContentType
         assert result.body is None
-        assert result.parameters == {
-            'header': {
+        assert result.parameters == RequestParameters(
+            header={
                 'api_key': self.api_key,
             },
-            'cookie': {
+            cookie={
                 'user': 123,
             },
-        }
+        )
 
     def test_post_pets(self, validator, spec_dict):
         pet_name = 'Cat'
@@ -195,14 +196,14 @@ class TestRequestValidator(object):
         result = validator.validate(request)
 
         assert result.errors == []
-        assert result.parameters == {
-            'header': {
+        assert result.parameters == RequestParameters(
+            header={
                 'api_key': self.api_key,
             },
-            'cookie': {
+            cookie={
                 'user': 123,
             },
-        }
+        )
 
         schemas = spec_dict['components']['schemas']
         pet_model = schemas['PetCreate']['x-model']
@@ -225,11 +226,11 @@ class TestRequestValidator(object):
 
         assert result.errors == []
         assert result.body is None
-        assert result.parameters == {
-            'path': {
+        assert result.parameters == RequestParameters(
+            path={
                 'petId': 1,
             },
-        }
+        )
 
 
 class TestPathItemParamsValidator(object):
@@ -280,7 +281,7 @@ class TestPathItemParamsValidator(object):
         assert len(result.errors) == 1
         assert type(result.errors[0]) == MissingRequiredParameter
         assert result.body is None
-        assert result.parameters == {}
+        assert result.parameters == RequestParameters()
 
     def test_request_invalid_param(self, validator):
         request = MockRequest(
@@ -292,7 +293,7 @@ class TestPathItemParamsValidator(object):
         assert len(result.errors) == 1
         assert type(result.errors[0]) == InvalidParameterValue
         assert result.body is None
-        assert result.parameters == {}
+        assert result.parameters == RequestParameters()
 
     def test_request_valid_param(self, validator):
         request = MockRequest(
@@ -303,7 +304,7 @@ class TestPathItemParamsValidator(object):
 
         assert len(result.errors) == 0
         assert result.body is None
-        assert result.parameters == {'query': {'resId': 10}}
+        assert result.parameters == RequestParameters(query={'resId': 10})
 
     def test_request_override_param(self, spec_dict):
         # override path parameter on operation
@@ -324,7 +325,7 @@ class TestPathItemParamsValidator(object):
 
         assert len(result.errors) == 0
         assert result.body is None
-        assert result.parameters == {}
+        assert result.parameters == RequestParameters()
 
     def test_request_override_param_uniqueness(self, spec_dict):
         # add parameter on operation with same name as on path but
@@ -347,7 +348,7 @@ class TestPathItemParamsValidator(object):
         assert len(result.errors) == 1
         assert type(result.errors[0]) == MissingRequiredParameter
         assert result.body is None
-        assert result.parameters == {}
+        assert result.parameters == RequestParameters()
 
 
 class TestResponseValidator(object):