diff --git a/src/services/TickerService.test.ts b/src/services/TickerService.test.ts
new file mode 100644
index 0000000..6c02ff6
--- /dev/null
+++ b/src/services/TickerService.test.ts
@@ -0,0 +1,85 @@
+import { describe, expect, test, vi } from 'vitest'
+import { TickerService } from './TickerService'
+
+const ticker = 'XPLG11'
+
+describe('TickerService', () => {
+  test('should return result with success', async () => {
+    const service = new TickerService(ticker)
+    const result = await service.fetch()
+
+    expect(result).toBeDefined()
+    expect(result.ticker).toBe(ticker)
+    expect(result.pvp).toBe(1.05)
+    expect(result.dy12).toBe(8.21)
+    expect(result.price).toBe(107)
+    expect(result.dividend12).toBe(8.79)
+    expect(result.lastDividend).toBe(0.74)
+    expect(result.dividendsHistory.length).toBe(12)
+    expect(result.pricesHistory.length).toBeTruthy()
+  })
+
+  test('should return error when ticker is invalid', async () => {
+    await expect(async () => {
+      return new TickerService('invalid').fetch()
+    }).rejects.toThrowError('Ocorreu um erro ao buscar o ticker')
+  })
+
+  test('should return error when ticker is empty', async () => {
+    await expect(async () => {
+      return new TickerService('').fetch()
+    }).rejects.toThrowError('Ocorreu um erro ao buscar o ticker')
+  })
+
+  test('should return error when ticker is null', async () => {
+    await expect(async () => {
+      return new TickerService(null as any).fetch()
+    }).rejects.toThrowError('Ocorreu um erro ao buscar o ticker')
+  })
+
+  test('should return dividendsHistory with array of object', async () => {
+    const service = new TickerService(ticker)
+    const result = await service.fetch()
+
+    expect(result).toBeDefined()
+    expect(result.dividendsHistory.length).toBe(12)
+
+    expect(result.dividendsHistory[0]).toEqual({
+      kind: 'cash',
+      currency: 'brl',
+      isin_code: 'BRXPLGCTF002',
+      label: 'Rendimento',
+      amount: 0.78,
+      approved_in: '2023-10-31',
+      traded_until: '2023-10-31',
+      payment_date: '2023-11-16',
+    })
+
+    expect(result.dividendsHistory[11]).toEqual({
+      kind: 'cash',
+      currency: 'brl',
+      isin_code: 'BRXPLGCTF002',
+      label: 'Rendimento',
+      amount: 0.74,
+      approved_in: '2023-03-31',
+      traded_until: '2023-03-31',
+      payment_date: '2023-04-17',
+    })
+  })
+
+  test('should return pricesHistory with array of object', async () => {
+    const service = new TickerService(ticker)
+    const result = await service.fetch()
+
+    expect(result).toBeDefined()
+    expect(result.pricesHistory.length).toBeTruthy()
+
+    expect(result.pricesHistory[0]).toEqual({
+      timestamp: 1700535600000,
+      avg: 107.7,
+      min: 107,
+      max: 108.56,
+      date: '21/Nov',
+    })
+  })
+})
diff --git a/src/services/TickerService.ts b/src/services/TickerService.ts
index bd9c7b5..f8023b1 100644
--- a/src/services/TickerService.ts
+++ b/src/services/TickerService.ts
@@ -50,24 +50,28 @@ export class TickerService {
   }
 
   public async fetch(): Promise<TickerData> {
-    const { price, pvp } = await this.fetchTicker(this.ticker)
-    const pricesHistory = await this.fetchPricesHistory(this.ticker)
-    const dividendsHistory = await this.fetchDividendsHistory(this.ticker)
-
-    const { dividend12, dy12, lastDividend } = this.getDividendsByHistory(
-      dividendsHistory,
-      price,
-    )
-
-    return {
-      pvp,
-      dy12,
-      price,
-      dividend12,
-      lastDividend,
-      dividendsHistory,
-      pricesHistory,
-      ticker: this.ticker,
+    try {
+      const { price, pvp } = await this.fetchTicker(this.ticker)
+      const pricesHistory = await this.fetchPricesHistory(this.ticker)
+      const dividendsHistory = await this.fetchDividendsHistory(this.ticker)
+
+      const { dividend12, dy12, lastDividend } = this.getDividendsByHistory(
+        dividendsHistory,
+        price,
+      )
+
+      return {
+        pvp,
+        dy12,
+        price,
+        dividend12,
+        lastDividend,
+        dividendsHistory,
+        pricesHistory,
+        ticker: this.ticker,
+      }
+    } catch (_err) {
+      throw new Error('Ocorreu um erro ao buscar o ticker')
     }
   }
 
@@ -156,11 +160,14 @@ export class TickerService {
     dividendsHistory: DividendsHistory[],
     price: number,
   ) {
-    const lastDividend = last(dividendsHistory)?.amount || 0
+    const lastDividend = round(last(dividendsHistory)?.amount || 0, 2)
 
-    const dividend12 = dividendsHistory.reduce((acc, dividend) => {
-      return acc + dividend.amount
-    }, 0)
+    const dividend12 = round(
+      dividendsHistory.reduce((acc, dividend) => {
+        return acc + dividend.amount
+      }, 0),
+      2,
+    )
 
     const dy12 = round((dividend12 / price) * 100, 2)