diff --git a/packages/di/di.tsx b/packages/di/di.tsx
index ee2d4d93..5d253b07 100644
--- a/packages/di/di.tsx
+++ b/packages/di/di.tsx
@@ -20,8 +20,8 @@ export function withRegistry(...registries: Registry[]) {
                             const overrides = contextRegistries[registry.id];
 
                             providedRegistries[registry.id] = registry.inverted
-                                ? (overrides || registry)
-                                : (registry || overrides);
+                                ? overrides ? registry.merge(overrides) : registry
+                                : (registry && overrides) ? overrides.merge(registry) : registry;
                         });
 
                         return (
@@ -63,7 +63,6 @@ interface IRegistryComponents {
 export class Registry {
     id: string;
     inverted: boolean;
-
     private components: IRegistryComponents = {};
 
     constructor({ id, inverted = false }: IRegistryOptions) {
@@ -98,7 +97,24 @@ export class Registry {
         return this.components[id];
     }
 
+    /**
+     * Returns list of components from registry.
+     */
     snapshot<RT>(): RT  {
         return this.components as any;
     }
+
+    /**
+     * Override components by external registry.
+     *
+     * @param registry external registry
+     */
+    merge(registry: Registry) {
+        this.components = {
+            ...this.components,
+            ...(registry ? registry.snapshot() : {}),
+        };
+
+        return this;
+    }
 }
diff --git a/packages/di/test/di.test.tsx b/packages/di/test/di.test.tsx
index 7585cae0..6ab61180 100644
--- a/packages/di/test/di.test.tsx
+++ b/packages/di/test/di.test.tsx
@@ -1,25 +1,231 @@
+// tslint:disable no-shadowed-variable
+import React from 'react';
+import { describe, it } from 'mocha';
 import { expect } from 'chai';
+import { render } from 'enzyme';
 
-import { Registry } from '../di';
+import { Registry, withRegistry, RegistryConsumer, ComponentRegistryConsumer } from '../di';
+
+interface ICommonProps {
+    className?: string;
+}
 
 describe('@bem-react/di', () => {
     describe('Registry', () => {
-        it('should set components and return this by id', () => {
-            const registry = new Registry({ id: 'id' });
+        it('should set and components by id', () => {
+            const registry = new Registry({ id: 'registry' });
+            const Component1 = () => null;
+            const Component2 = () => <span/>;
+
+            registry
+                .set('id-1', Component1)
+                .set('id-2', Component2);
+
+            expect(registry.get('id-1')).to.eq(Component1);
+            expect(registry.get('id-2')).to.eq(Component2);
+        });
+
+        it('should return list of components', () => {
+            const registry = new Registry({ id: 'registry' });
+            const Component1 = () => null;
+            const Component2 = () => <span/>;
+
+            registry
+                .set('id-1', Component1)
+                .set('id-2', Component2);
+
+            const snapshot = {
+                'id-1': Component1,
+                'id-2': Component2,
+            };
+
+            expect(registry.snapshot()).to.eql(snapshot);
+        });
+
+        it('should merge registries', () => {
+            const registry = new Registry({ id: 'registry' });
             const Component1 = () => null;
-            const Component2 = () => null;
+            const Component2 = () => <span/>;
 
             registry
                 .set('id-1', Component1)
                 .set('id-2', Component2);
 
-            expect(registry.get('id-1')).to.equal(Component1);
-            expect(registry.get('id-2')).to.equal(Component2);
+            const overrides = new Registry({ id: 'overrides' });
+            const Component1Overrided = () => <div/>;
+
+            overrides.set('id-1', Component1Overrided);
+
+            const snapshot = {
+                'id-1': Component1Overrided,
+                'id-2': Component2,
+            };
+
+            expect(registry.merge(overrides).snapshot()).to.eql(snapshot);
+        });
+
+        it('should not affect registry in merge with undefined', () => {
+            const registry = new Registry({ id: 'registry' });
+            const Component1 = () => null;
+            const Component2 = () => <span/>;
+
+            registry
+                .set('id-1', Component1)
+                .set('id-2', Component2);
+
+            const snapshot = {
+                'id-1': Component1,
+                'id-2': Component2,
+            };
+
+            // @ts-ignore to check inside logic
+            expect(registry.merge().snapshot()).to.eql(snapshot);
+        });
+
+        it('should throw error when component doesn\'t exist', () => {
+            const registry = new Registry({ id: 'registry' });
+
+            expect(() => registry.get('id')).to.throw('Component with id \'id\' not found.');
         });
     });
 
-    describe.skip('withRegistry', () => {
-        // TODO: Add test for withRegistry
-        return null;
+    describe('withRegistry', () => {
+        it('should provide registry to context', () => {
+            const compositorRegistry = new Registry({ id: 'Compositor' });
+            const Element: React.SFC<ICommonProps> = () => <span>content</span>;
+
+            interface ICompositorRegistry {
+                Element: React.ComponentType<ICommonProps>;
+            }
+
+            compositorRegistry.set('Element', Element);
+
+            const CompositorPresenter: React.SFC<ICommonProps> = () => (
+                <RegistryConsumer>
+                    {registries => {
+                        const registry = registries['Compositor'];
+                        const { Element } = registry.snapshot<ICompositorRegistry>();
+
+                        return <Element/>;
+                    }}
+                </RegistryConsumer>
+            );
+
+            const Compositor = withRegistry(compositorRegistry)(CompositorPresenter);
+
+            expect(render(<Compositor/>).text()).eq('content');
+        });
+
+        it('should provide assign registry with component', () => {
+            const compositorRegistry = new Registry({ id: 'Compositor' });
+            const Element: React.SFC<ICommonProps> = () => <span>content</span>;
+
+            interface ICompositorRegistry {
+                Element: React.ComponentType<ICommonProps>;
+            }
+
+            compositorRegistry.set('Element', Element);
+
+            const CompositorPresenter: React.SFC<ICommonProps> = () => (
+                <ComponentRegistryConsumer id="Compositor">
+                    {({ Element }: ICompositorRegistry) => <Element/>}
+                </ComponentRegistryConsumer>
+            );
+
+            const Compositor = withRegistry(compositorRegistry)(CompositorPresenter);
+
+            expect(render(<Compositor/>).text()).eq('content');
+        });
+
+        it('should override components in registry by context', () => {
+            const compositorRegistry = new Registry({ id: 'Compositor' });
+            const Element: React.SFC<ICommonProps> = () => <span>content</span>;
+
+            const overridedCompositorRegistry = new Registry({ id: 'Compositor' });
+            const OverridedElement: React.SFC<ICommonProps> = () => <span>overrided</span>;
+
+            interface ICompositorRegistry {
+                Element: React.ComponentType<ICommonProps>;
+            }
+
+            compositorRegistry.set('Element', Element);
+            overridedCompositorRegistry.set('Element', OverridedElement);
+
+            const CompositorPresenter: React.SFC<ICommonProps> = () => {
+                const Content: React.SFC<ICommonProps> = withRegistry(overridedCompositorRegistry)(() => (
+                    <ComponentRegistryConsumer id="Compositor">
+                        {({ Element }: ICompositorRegistry) => <Element/>}
+                    </ComponentRegistryConsumer>
+                ));
+
+                return <Content/>;
+            };
+
+            const Compositor = withRegistry(compositorRegistry)(CompositorPresenter);
+
+            expect(render(<Compositor/>).text()).eq('overrided');
+        });
+
+        it('should override components in registry from top node', () => {
+            const compositorRegistry = new Registry({ id: 'Compositor', inverted: true });
+            const Element: React.SFC<ICommonProps> = () => <span>content</span>;
+
+            const overridedCompositorRegistry = new Registry({ id: 'Compositor' });
+            const OverridedElement: React.SFC<ICommonProps> = () => <span>overrided</span>;
+
+            interface ICompositorRegistry {
+                Element: React.ComponentType<ICommonProps>;
+            }
+
+            compositorRegistry.set('Element', Element);
+            overridedCompositorRegistry.set('Element', OverridedElement);
+
+            const CompositorPresenter: React.SFC<ICommonProps> = () => (
+                <ComponentRegistryConsumer id="Compositor">
+                    {({ Element }: ICompositorRegistry) => <Element/>}
+                </ComponentRegistryConsumer>
+            );
+
+            const Compositor = withRegistry(compositorRegistry)(CompositorPresenter);
+            const OverridedCompositor = withRegistry(overridedCompositorRegistry)(Compositor);
+
+            expect(render(<Compositor/>).text()).eq('content');
+            expect(render(<OverridedCompositor/>).text()).eq('overrided');
+        });
+
+        it('should partially override components in registry', () => {
+            const compositorRegistry = new Registry({ id: 'Compositor', inverted: true });
+            const Element1: React.SFC<ICommonProps> = () => <span>content</span>;
+            const Element2: React.SFC<ICommonProps> = () => <span>extra</span>;
+
+            const overridedCompositorRegistry = new Registry({ id: 'Compositor' });
+            const OverridedElement: React.SFC<ICommonProps> = () => <span>overrided</span>;
+
+            interface ICompositorRegistry {
+                Element1: React.ComponentType<ICommonProps>;
+                Element2: React.ComponentType<ICommonProps>;
+            }
+
+            compositorRegistry.set('Element1', Element1);
+            compositorRegistry.set('Element2', Element2);
+            overridedCompositorRegistry.set('Element1', OverridedElement);
+
+            const CompositorPresenter: React.SFC<ICommonProps> = () => (
+                <ComponentRegistryConsumer id="Compositor">
+                    {({ Element1, Element2 }: ICompositorRegistry) => (
+                        <>
+                            <Element1/>
+                            <Element2/>
+                        </>
+                    )}
+                </ComponentRegistryConsumer>
+            );
+
+            const Compositor = withRegistry(compositorRegistry)(CompositorPresenter);
+            const OverridedCompositor = withRegistry(overridedCompositorRegistry)(Compositor);
+
+            expect(render(<Compositor/>).text()).eq('contentextra');
+            expect(render(<OverridedCompositor/>).text()).eq('overridedextra');
+        });
     });
 });