diff --git a/src/components/store/actions/blockReducerActions.ts b/src/components/store/actions/blockReducerActions.ts
new file mode 100644
index 00000000..3592a9f3
--- /dev/null
+++ b/src/components/store/actions/blockReducerActions.ts
@@ -0,0 +1,39 @@
+import { OutputBlockData } from '../../../../types';
+import { BlockMutationType } from '../../../../types/events/block/mutation-type';
+import { ChangeBlockDataAction, CreateBlockAction, RemoveBlockAction } from '../../../../types/store/action';
+
+/**
+ * Action creator for creating a new block in the store
+ *
+ * @param block - new block data
+ */
+export function makeCreateBlockAction(block: OutputBlockData): CreateBlockAction {
+  return {
+    type: BlockMutationType.Added,
+    data: block,
+  };
+}
+
+/**
+ * Action creator for changing block data in the store
+ *
+ * @param block - new block data
+ */
+export function makeChangeBlockAction(block: OutputBlockData): ChangeBlockDataAction {
+  return {
+    type: BlockMutationType.Changed,
+    data: block,
+  };
+}
+
+/**
+ * Action creator for removing block data from the store
+ *
+ * @param blockId - id of a block for removing
+ */
+export function makeRemoveBlockAction(blockId: string): RemoveBlockAction {
+  return {
+    type: BlockMutationType.Removed,
+    blockId,
+  };
+}
diff --git a/src/components/store/demo.ts b/src/components/store/demo.ts
deleted file mode 100644
index b62e0576..00000000
--- a/src/components/store/demo.ts
+++ /dev/null
@@ -1,79 +0,0 @@
-import store from './index';
-import { BlockMutationType } from '../../../types/events/block/mutation-type';
-import { EditorState } from '../../../types/store/editorState';
-import { Listener } from '../../../types/store/listener';
-
-/**
- * Handle changes with previous and current states
- */
-const onDataChange = (): Listener => {
-  /**
-   * Initial state
-   */
-  let currentState = store.getState();
-
-  /**
-   * onChange handler
-   *
-   * @param changedState - changed state after dispatching
-   */
-  return (changedState: EditorState): void => {
-    const prevState = currentState;
-
-    currentState = changedState;
-
-    console.log('***');
-    console.log('Previous state:', prevState);
-    console.log('Current state:', currentState);
-    console.log('***');
-  };
-};
-
-const unsubscribeOnDataChange = store.subscribe(onDataChange());
-
-const block1 = {
-  id: '3JPEqh8_Wc',
-  type: 'header',
-  data: {
-    text: 'Editor.js',
-    level: 2,
-  },
-};
-
-const block2 = {
-  id: 'AsbMKCuatV',
-  type: 'paragraph',
-  data: {
-    text: 'Hey. Meet the new <b>Editor</b>. On this page you can see it in action — try to edit this text.',
-  },
-};
-
-const block2Changed = {
-  id: 'AsbMKCuatV',
-  type: 'paragraph',
-  data: {
-    text: 'Hey. Meet the new Editor. On this page you can see it in action — try to edit this text.',
-  },
-};
-
-store.dispatch({
-  type: BlockMutationType.Added,
-  data: block1,
-});
-
-store.dispatch({
-  type: BlockMutationType.Added,
-  data: block2,
-});
-
-store.dispatch({
-  type: BlockMutationType.Changed,
-  data: block2Changed,
-});
-
-store.dispatch({
-  type: BlockMutationType.Removed,
-  blockId: block1.id,
-});
-
-unsubscribeOnDataChange();
diff --git a/test/cypress/tests/store/store.spec.ts b/test/cypress/tests/store/store.spec.ts
new file mode 100644
index 00000000..a36ed322
--- /dev/null
+++ b/test/cypress/tests/store/store.spec.ts
@@ -0,0 +1,112 @@
+import createStore from '../../../../src/components/store/createStore';
+import { EditorState } from '../../../../types/store/editorState';
+import blocksReducer from '../../../../src/components/store/blocksReducer';
+import { makeChangeBlockAction, makeCreateBlockAction, makeRemoveBlockAction } from '../../../../src/components/store/actions/blockReducerActions';
+
+describe('State manager', () => {
+  it('should create the store without initial state', () => {
+    const emptyReducer = (state: EditorState): EditorState => state;
+
+    const store = createStore(emptyReducer);
+
+    expect(store.getState()).to.deep.equal({ blocks: {} });
+  });
+
+  it('should create the store with initial state', () => {
+    const emptyReducer = (state: EditorState): EditorState => state;
+    const initialState = {
+      blocks: {
+        '3JPEqh8_Wc': {
+          id: '3JPEqh8_Wc',
+          type: 'header',
+          data: {
+            text: 'Editor.js',
+            level: 2,
+          },
+        },
+      },
+    };
+
+    const store = createStore(emptyReducer, initialState);
+
+    expect(store.getState()).to.deep.equal(initialState);
+  });
+
+  describe('blocksReducer', () => {
+    it('should create a new block in the state', () => {
+      const store = createStore(blocksReducer);
+      const block = {
+        id: '3JPEqh8_Wc',
+        type: 'header',
+        data: {
+          text: 'Editor.js',
+          level: 2,
+        },
+      };
+      const expectedResult = {
+        blocks: {
+          '3JPEqh8_Wc': block,
+        },
+      };
+
+      store.dispatch(makeCreateBlockAction(block));
+
+      expect(store.getState()).to.be.deep.equal(expectedResult);
+    });
+
+    it('should change block data in the state', () => {
+      const block = {
+        id: '3JPEqh8_Wc',
+        type: 'header',
+        data: {
+          text: 'Editor.js',
+          level: 2,
+        },
+      };
+      const store = createStore(blocksReducer, {
+        blocks: {
+          [block.id]: block,
+        },
+      });
+      const changedBlock = {
+        ...block,
+        data: {
+          ...block.data,
+          text: 'New Editor.js!',
+        },
+      };
+      const expectedResult = {
+        blocks: {
+          [changedBlock.id]: changedBlock,
+        },
+      };
+
+      store.dispatch(makeChangeBlockAction(changedBlock));
+
+      expect(store.getState()).to.be.deep.equal(expectedResult);
+    });
+
+    it('should remove block data from the state', () => {
+      const block = {
+        id: '3JPEqh8_Wc',
+        type: 'header',
+        data: {
+          text: 'Editor.js',
+          level: 2,
+        },
+      };
+      const store = createStore(blocksReducer, {
+        blocks: {
+          [block.id]: block,
+        },
+      });
+      const expectedResult = {
+        blocks: {},
+      };
+
+      store.dispatch(makeRemoveBlockAction(block.id));
+
+      expect(store.getState()).to.be.deep.equal(expectedResult);
+    });
+  });
+});
diff --git a/types/store/action.ts b/types/store/action.ts
index 21b7948d..87d8c700 100644
--- a/types/store/action.ts
+++ b/types/store/action.ts
@@ -5,7 +5,7 @@ import { BlockMutationType } from '../events/block/mutation-type';
  * Action for creating a new block in the editor
  * This action will add the new block to the state
  */
-interface CreateBlockAction {
+export interface CreateBlockAction {
   type: BlockMutationType.Added;
   data: OutputBlockData;
 }
@@ -14,7 +14,7 @@ interface CreateBlockAction {
  * Action for changing data of an existing block
  * This action will change block data in the state by its id
  */
-interface ChangeBlockDataAction {
+export interface ChangeBlockDataAction {
   type: BlockMutationType.Changed;
   data: OutputBlockData;
 }
@@ -23,7 +23,7 @@ interface ChangeBlockDataAction {
  * Action for removing a block from the editor
  * This action will remove the block from the state by its id
  */
-interface RemoveBlockAction {
+export interface RemoveBlockAction {
   type: BlockMutationType.Removed;
   blockId: string;
 }