diff --git a/tests/statemachine.spec.ts b/tests/statemachine.spec.ts
new file mode 100644
index 0000000..5cd1dd6
--- /dev/null
+++ b/tests/statemachine.spec.ts
@@ -0,0 +1,398 @@
+import { StateMachine } from '../src/index'
+
+
+describe('StateMachine', () => {
+    let simpleIntFSM: StateMachine;
+    let objectIntFSM: StateMachine;
+    let simpleStrFSM: StateMachine;
+    let objectStrFSM: StateMachine;
+
+    enum IntStatus {
+        PENDING = 1,
+        ACTIVE = 2,
+        ARCHIVED = 3,
+        DELETED = 4,
+    }
+
+    enum StrStatus {
+        PENDING = 'PENDING',
+        ACTIVE = 'ACTIVE',
+        ARCHIVED = 'ARCHIVED',
+        DELETED = 'DELETED',
+    }
+
+    beforeAll(() => {
+        const emptyHandler = async () => {};
+
+        const onEnter = emptyHandler;
+        const onLeave = emptyHandler;
+        const onBeforeChange = emptyHandler;
+        const onChange = emptyHandler;
+
+        simpleIntFSM = new StateMachine(IntStatus.PENDING, {
+            onEnter,
+            onLeave,
+            [IntStatus.PENDING]: {
+                active: IntStatus.ACTIVE,
+                delete: IntStatus.DELETED,
+            },
+            [IntStatus.ACTIVE]: {
+                toDraft: IntStatus.PENDING,
+                archive: IntStatus.ARCHIVED,
+                doNothing: IntStatus.ACTIVE,
+            }
+        });
+
+        objectIntFSM = new StateMachine(IntStatus.PENDING, {
+            onEnter,
+            onLeave,
+            [IntStatus.PENDING]: {
+                active: {
+                    state: IntStatus.ACTIVE,
+                    onBeforeChange,
+                    onChange,
+                },
+                delete: {
+                    state: IntStatus.DELETED,
+                    onBeforeChange,
+                    onChange,
+                }
+            },
+            [IntStatus.ACTIVE]: {
+                toDraft: {
+                    state: IntStatus.PENDING,
+                },
+                archive: {
+                    state: IntStatus.ARCHIVED,
+                },
+                doNothing: {
+                    state: IntStatus.ACTIVE,
+                    onBeforeChange,
+                    onChange,
+                },
+            },
+        });
+
+        simpleStrFSM = new StateMachine(StrStatus.PENDING, {
+            onEnter,
+            onLeave,
+            [StrStatus.PENDING]: {
+                active: StrStatus.ACTIVE,
+                delete: StrStatus.DELETED,
+            },
+            [StrStatus.ACTIVE]: {
+                toDraft: StrStatus.PENDING,
+                archive: StrStatus.ARCHIVED,
+                doNothing: StrStatus.ACTIVE,
+            }
+        });
+
+        objectStrFSM = new StateMachine(StrStatus.PENDING, {
+            onEnter,
+            onLeave,
+            [StrStatus.PENDING]: {
+                active: {
+                    state: StrStatus.ACTIVE,
+                    onBeforeChange,
+                    onChange,
+                },
+                delete: {
+                    state: StrStatus.DELETED,
+                    onBeforeChange,
+                    onChange
+                }
+            },
+            [StrStatus.ACTIVE]: {
+                toDraft: {
+                    state: StrStatus.PENDING,
+                },
+                archive: {
+                    state: StrStatus.ARCHIVED,
+                },
+                doNothing: {
+                    state: StrStatus.ACTIVE,
+                    onBeforeChange,
+                    onChange,
+                },
+            },
+        });
+    });
+
+    afterEach(() => {
+        // @ts-ignore
+        simpleIntFSM._currentState = IntStatus.PENDING;
+        // @ts-ignore
+        objectIntFSM._currentState = IntStatus.PENDING;
+        // @ts-ignore
+        simpleStrFSM._currentState = StrStatus.PENDING;
+        // @ts-ignore
+        objectStrFSM._currentState = StrStatus.PENDING;
+    });
+
+    describe('.getCurrentState', () => {
+        describe('<IntStatus>', () => {
+            it('should return initial int state for simple fsm model', () => {
+                expect(simpleIntFSM.getCurrentState()).toBe(IntStatus.PENDING);
+            });
+
+            it('should return changed int state after action for simple fsm model', async () => {
+                await simpleIntFSM.active();
+                expect(simpleIntFSM.getCurrentState()).toBe(IntStatus.ACTIVE);
+            });
+
+            it('should return initial int state after action for simple fsm model if initial states equals next state', async () => {
+                await simpleIntFSM.doNothing();
+                expect(simpleIntFSM.getCurrentState()).toBe(IntStatus.PENDING);
+            });
+
+
+            it('should return initial int state for object fsm model', () => {
+                expect(objectIntFSM.getCurrentState()).toBe(IntStatus.PENDING);
+            });
+
+            it('should return changed int state after action for object fsm model', async () => {
+                await objectIntFSM.active();
+                expect(objectIntFSM.getCurrentState()).toBe(IntStatus.ACTIVE);
+            });
+
+            it('should return initial int state after action for object fsm model if initial state equals next state', async () => {
+                await objectIntFSM.doNothing();
+                expect(objectIntFSM.getCurrentState()).toBe(IntStatus.PENDING);
+            });
+        });
+
+        describe('<StrStatus>', () => {
+            it('should return initial str state for simple fsm model', () => {
+                expect(simpleStrFSM.getCurrentState()).toBe(StrStatus.PENDING);
+            });
+
+            it('should return changed str state after action for simple fsm model', async () => {
+                await simpleStrFSM.active();
+                expect(simpleStrFSM.getCurrentState()).toBe(StrStatus.ACTIVE);
+            });
+
+            it('should return initial str state after action for simple fsm model if initial states equals next state', async () => {
+                await simpleStrFSM.doNothing();
+                expect(simpleStrFSM.getCurrentState()).toBe(StrStatus.PENDING);
+            });
+
+
+            it('should return initial str state for object fsm model', () => {
+                expect(objectStrFSM.getCurrentState()).toBe(StrStatus.PENDING);
+            });
+
+            it('should return changed str state after action for object fsm model', async () => {
+                await objectStrFSM.active();
+                expect(objectStrFSM.getCurrentState()).toBe(StrStatus.ACTIVE);
+            });
+
+            it('should return initial str state after action for object fsm model if initial state equals next state', async () => {
+                await objectStrFSM.doNothing();
+                expect(objectStrFSM.getCurrentState()).toBe(StrStatus.PENDING);
+            });
+        })
+    });
+
+    describe('.can', () => {
+        describe('<IntStatus>', () => {
+            it('should return true for simple fsm model', () => {
+                expect(simpleIntFSM.can('active')).toBeTruthy();
+            });
+
+            it('should return false for simple fsm model if check undefined action', () => {
+                expect(simpleIntFSM.can('archive')).toBeFalsy();
+            });
+
+            it('should return true after action for simple fsm model', async () => {
+                await simpleIntFSM.active();
+                expect(simpleIntFSM.can('archive')).toBeTruthy();
+            });
+
+            it('should return false after action for simple fsm model if check undefined action', async () => {
+                await simpleIntFSM.active();
+                expect(simpleIntFSM.can('active')).toBeFalsy();
+            });
+
+            it('should return false if config for state is not defined in simple fsm model', async () => {
+                await simpleIntFSM.delete();
+                expect(simpleIntFSM.can('active')).toBeFalsy();
+            });
+
+
+            it('should return true for object fsm model', () => {
+                expect(objectIntFSM.can('active')).toBeTruthy();
+            });
+
+            it('should return false for object fsm model if check undefined action', () => {
+                expect(objectIntFSM.can('archive')).toBeFalsy();
+            });
+
+            it('should return true after action for object fsm model', async () => {
+                await objectIntFSM.active();
+                expect(objectIntFSM.can('archive')).toBeTruthy();
+            });
+
+            it('should return false after action for object fsm model if check undefined action', async () => {
+                await objectIntFSM.active();
+                expect(objectIntFSM.can('active')).toBeFalsy();
+            });
+
+            it('should return false if config for state is not defined in object fsm model', async () => {
+                await objectIntFSM.delete();
+                expect(objectIntFSM.can('active')).toBeFalsy();
+            });
+        });
+
+        describe('<StrStatus>', () => {
+            it('should return true for simple fsm model', () => {
+                expect(simpleStrFSM.can('active')).toBeTruthy();
+            });
+
+            it('should return false for simple fsm model if check undefined action', () => {
+                expect(simpleStrFSM.can('archive')).toBeFalsy();
+            });
+
+            it('should return true after action for simple fsm model', async () => {
+                await simpleStrFSM.active();
+                expect(simpleStrFSM.can('archive')).toBeTruthy();
+            });
+
+            it('should return false after action for simple fsm model if check undefined action', async () => {
+                await simpleStrFSM.active();
+                expect(simpleStrFSM.can('active')).toBeFalsy();
+            });
+
+            it('should return false if config for state is not defined in simple fsm model', async () => {
+                await simpleStrFSM.delete();
+                expect(simpleStrFSM.can('active')).toBeFalsy();
+            });
+
+
+            it('should return true for object fsm model', () => {
+                expect(objectStrFSM.can('active')).toBeTruthy();
+            });
+
+            it('should return false for object fsm model if check undefined action', () => {
+                expect(objectStrFSM.can('archive')).toBeFalsy();
+            });
+
+            it('should return true after action for object fsm model', async () => {
+                await objectStrFSM.active();
+                expect(objectStrFSM.can('archive')).toBeTruthy();
+            });
+
+            it('should return false after action for object fsm model if check undefined action', async () => {
+                await objectStrFSM.active();
+                expect(objectStrFSM.can('active')).toBeFalsy();
+            });
+
+            it('should return false if config for state is not defined in object fsm model', async () => {
+                await objectStrFSM.delete();
+                expect(objectStrFSM.can('active')).toBeFalsy();
+            });
+        });
+    })
+
+
+    describe('.canToState', () => {
+        describe('<IntStatus>', () => {
+            it('should return true for simple fsm model', () => {
+                expect(simpleIntFSM.canToState(IntStatus.ACTIVE)).toBeTruthy();
+            });
+
+            it('should return false for simple fsm model if check undefined state', () => {
+                expect(simpleIntFSM.canToState(IntStatus.ARCHIVED)).toBeFalsy();
+            });
+
+            it('should return true after action for simple fsm model', async () => {
+                await simpleIntFSM.active();
+                expect(simpleIntFSM.canToState(IntStatus.ARCHIVED)).toBeTruthy();
+            });
+
+            it('should return false after action for simple fsm model if check undefined state', async () => {
+                await simpleIntFSM.active();
+                expect(simpleIntFSM.canToState(IntStatus.DELETED)).toBeFalsy();
+            });
+
+            it('should return false if config for state is not defined in simple fsm model', async () => {
+                await simpleIntFSM.delete();
+                expect(simpleIntFSM.canToState(IntStatus.ACTIVE)).toBeFalsy();
+            });
+
+
+            it('should return true for object fsm model', () => {
+                expect(objectIntFSM.canToState(IntStatus.ACTIVE)).toBeTruthy();
+            });
+
+            it('should return false for object fsm model if check undefined action', () => {
+                expect(objectIntFSM.canToState(IntStatus.ARCHIVED)).toBeFalsy();
+            });
+
+            it('should return true after action for object fsm model', async () => {
+                await objectIntFSM.active();
+                expect(objectIntFSM.canToState(IntStatus.ARCHIVED)).toBeTruthy();
+            });
+
+            it('should return false after action for object fsm model if check undefined state', async () => {
+                await objectIntFSM.active();
+                expect(objectIntFSM.canToState(IntStatus.DELETED)).toBeFalsy();
+            });
+
+            it('should return false if config for state is not defined in simple fsm model', async () => {
+                await simpleIntFSM.delete();
+                expect(simpleIntFSM.canToState(IntStatus.ACTIVE)).toBeFalsy();
+            });
+        });
+
+        describe('<StrStatus>', () => {
+            it('should return true for simple fsm model', () => {
+                expect(simpleStrFSM.canToState(StrStatus.ACTIVE)).toBeTruthy();
+            });
+
+            it('should return false for simple fsm model if check undefined action', () => {
+                expect(simpleStrFSM.canToState(StrStatus.ARCHIVED)).toBeFalsy();
+            });
+
+            it('should return true after action for simple fsm model', async () => {
+                await simpleStrFSM.active();
+                expect(simpleStrFSM.canToState(StrStatus.ARCHIVED)).toBeTruthy();
+            });
+
+            it('should return false after action for simple fsm model if check undefined state', async () => {
+                await simpleStrFSM.active();
+                expect(simpleStrFSM.canToState(StrStatus.DELETED)).toBeFalsy();
+            });
+
+            it('should return false if config for state is not defined in simple fsm model', async () => {
+                await simpleStrFSM.delete();
+                expect(simpleStrFSM.canToState(StrStatus.ACTIVE)).toBeFalsy();
+            });
+
+
+            it('should return true for object fsm model', () => {
+                expect(objectStrFSM.canToState(StrStatus.ACTIVE)).toBeTruthy();
+            });
+
+            it('should return false for object fsm model if check undefined state', () => {
+                expect(objectStrFSM.canToState(StrStatus.ARCHIVED)).toBeFalsy();
+            });
+
+            it('should return true after action for object fsm model', async () => {
+                await objectStrFSM.active();
+                expect(objectStrFSM.canToState(StrStatus.ARCHIVED)).toBeTruthy();
+            });
+
+            it('should return false after action for object fsm model if check undefined state', async () => {
+                await objectStrFSM.active();
+                expect(objectStrFSM.canToState(StrStatus.DELETED)).toBeFalsy();
+            });
+
+            it('should return false if config for state is not defined in simple fsm model', async () => {
+                await simpleStrFSM.delete();
+                expect(simpleStrFSM.canToState(StrStatus.ACTIVE)).toBeFalsy();
+            });
+        });
+    })
+
+
+});