diff --git a/test/unit/handlers/event-strategies/parameterized-replaceable-event-strategy.spec.ts b/test/unit/handlers/event-strategies/parameterized-replaceable-event-strategy.spec.ts
new file mode 100644
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--- /dev/null
+++ b/test/unit/handlers/event-strategies/parameterized-replaceable-event-strategy.spec.ts
@@ -0,0 +1,101 @@
+import chai from 'chai'
+import chaiAsPromised from 'chai-as-promised'
+import Sinon from 'sinon'
+
+chai.use(chaiAsPromised)
+
+import { EventDeduplicationMetadataKey, EventTags } from '../../../../src/constants/base'
+import { DatabaseClient } from '../../../../src/@types/base'
+import { Event } from '../../../../src/@types/event'
+import { EventRepository } from '../../../../src/repositories/event-repository'
+import { IEventRepository } from '../../../../src/@types/repositories'
+import { IEventStrategy } from '../../../../src/@types/message-handlers'
+import { IWebSocketAdapter } from '../../../../src/@types/adapters'
+import { ParameterizedReplaceableEventStrategy } from '../../../../src/handlers/event-strategies/parameterized-replaceable-event-strategy'
+import { WebSocketAdapterEvent } from '../../../../src/constants/adapter'
+
+const { expect } = chai
+
+describe('ParameterizedReplaceableEventStrategy', () => {
+  const event: Event = {
+    tags: [
+      [EventTags.Deduplication, 'dedup'],
+    ],
+  } as any
+  let webSocket: IWebSocketAdapter
+  let eventRepository: IEventRepository
+
+  let webSocketEmitStub: Sinon.SinonStub
+  let eventRepositoryUpsertStub: Sinon.SinonStub
+
+  let strategy: IEventStrategy<Event, Promise<void>>
+
+  let sandbox: Sinon.SinonSandbox
+
+  beforeEach(() => {
+    sandbox = Sinon.createSandbox()
+
+    eventRepositoryUpsertStub = sandbox.stub(EventRepository.prototype, 'upsert')
+
+    webSocketEmitStub = sandbox.stub()
+    webSocket = {
+      emit: webSocketEmitStub,
+    } as any
+    const client: DatabaseClient = {} as any
+    eventRepository = new EventRepository(client)
+
+    strategy = new ParameterizedReplaceableEventStrategy(webSocket, eventRepository)
+  })
+
+  afterEach(() => {
+    sandbox.restore()
+  })
+
+  describe('execute', () => {
+    it('upserts event without d tag', async () => {
+      event.tags = []
+      await strategy.execute(event)
+
+      expect(eventRepositoryUpsertStub).to.have.been.calledOnceWithExactly(event)
+      expect(eventRepositoryUpsertStub.firstCall.firstArg).to.have.property(EventDeduplicationMetadataKey).and.deep.equal([''])
+    })
+
+    it('upserts event with d tag and one string', async () => {
+      event.tags = [[EventTags.Deduplication, 'one']]
+      await strategy.execute(event)
+
+      expect(eventRepositoryUpsertStub).to.have.been.calledOnceWithExactly(event)
+      expect(eventRepositoryUpsertStub.firstCall.firstArg).to.have.property(EventDeduplicationMetadataKey).and.deep.equal(['one'])
+    })
+
+    it('upserts event with d tag and two strings', async () => {
+      event.tags = [[EventTags.Deduplication, 'one', 'two']]
+      await strategy.execute(event)
+
+      expect(eventRepositoryUpsertStub).to.have.been.calledOnceWithExactly(event)
+      expect(eventRepositoryUpsertStub.firstCall.firstArg).to.have.property(EventDeduplicationMetadataKey).and.deep.equal(['one', 'two'])
+    })
+
+    it('broadcast event if event is created', async () => {
+      eventRepositoryUpsertStub.resolves(1)
+
+      await strategy.execute(event)
+
+      expect(eventRepositoryUpsertStub).to.have.been.calledOnceWithExactly(event)
+      expect(webSocketEmitStub).to.have.been.calledOnceWithExactly(
+        WebSocketAdapterEvent.Broadcast,
+        event
+      )
+    })
+
+    it('rejects if unable to upsert event', async () => {
+      const error = new Error()
+      eventRepositoryUpsertStub.rejects(error)
+
+      await expect(strategy.execute(event)).to.eventually.be.rejectedWith(error)
+
+      expect(eventRepositoryUpsertStub).to.have.been.calledOnceWithExactly(event)
+      expect(webSocketEmitStub).not.to.have.been.called
+    })
+  })
+})