diff --git a/apps/api/src/app/portfolio/portfolio-calculator-baln-buy-and-sell.spec.ts b/apps/api/src/app/portfolio/portfolio-calculator-baln-buy-and-sell.spec.ts
index ea35cdd79..e19616ab4 100644
--- a/apps/api/src/app/portfolio/portfolio-calculator-baln-buy-and-sell.spec.ts
+++ b/apps/api/src/app/portfolio/portfolio-calculator-baln-buy-and-sell.spec.ts
@@ -62,6 +62,8 @@ describe('PortfolioCalculator', () => {
         parseDate('2021-11-22')
       );
 
+      const investmentsByMonth = portfolioCalculator.getInvestmentsByMonth();
+
       spy.mockRestore();
 
       expect(currentPositions).toEqual({
@@ -91,6 +93,10 @@ describe('PortfolioCalculator', () => {
         ],
         totalInvestment: new Big('0')
       });
+
+      expect(investmentsByMonth).toEqual([
+        { date: '2021-11-01', investment: new Big('12.6') }
+      ]);
     });
   });
 });
diff --git a/apps/api/src/app/portfolio/portfolio-calculator-baln-buy.spec.ts b/apps/api/src/app/portfolio/portfolio-calculator-baln-buy.spec.ts
index a6fe1af40..5ce20cf57 100644
--- a/apps/api/src/app/portfolio/portfolio-calculator-baln-buy.spec.ts
+++ b/apps/api/src/app/portfolio/portfolio-calculator-baln-buy.spec.ts
@@ -51,6 +51,8 @@ describe('PortfolioCalculator', () => {
         parseDate('2021-11-30')
       );
 
+      const investmentsByMonth = portfolioCalculator.getInvestmentsByMonth();
+
       spy.mockRestore();
 
       expect(currentPositions).toEqual({
@@ -80,6 +82,10 @@ describe('PortfolioCalculator', () => {
         ],
         totalInvestment: new Big('273.2')
       });
+
+      expect(investmentsByMonth).toEqual([
+        { date: '2021-11-01', investment: new Big('273.2') }
+      ]);
     });
   });
 });
diff --git a/apps/api/src/app/portfolio/portfolio-calculator-no-orders.spec.ts b/apps/api/src/app/portfolio/portfolio-calculator-no-orders.spec.ts
index 18d6cb34d..c10037dda 100644
--- a/apps/api/src/app/portfolio/portfolio-calculator-no-orders.spec.ts
+++ b/apps/api/src/app/portfolio/portfolio-calculator-no-orders.spec.ts
@@ -39,6 +39,8 @@ describe('PortfolioCalculator', () => {
         new Date()
       );
 
+      const investmentsByMonth = portfolioCalculator.getInvestmentsByMonth();
+
       spy.mockRestore();
 
       expect(currentPositions).toEqual({
@@ -51,6 +53,8 @@ describe('PortfolioCalculator', () => {
         positions: [],
         totalInvestment: new Big(0)
       });
+
+      expect(investmentsByMonth).toEqual([]);
     });
   });
 });
diff --git a/apps/api/src/app/portfolio/portfolio-calculator-novn-buy-and-sell-partially.spec.ts b/apps/api/src/app/portfolio/portfolio-calculator-novn-buy-and-sell-partially.spec.ts
index d215f9e1e..ef0bdf98c 100644
--- a/apps/api/src/app/portfolio/portfolio-calculator-novn-buy-and-sell-partially.spec.ts
+++ b/apps/api/src/app/portfolio/portfolio-calculator-novn-buy-and-sell-partially.spec.ts
@@ -62,6 +62,8 @@ describe('PortfolioCalculator', () => {
         parseDate('2022-03-07')
       );
 
+      const investmentsByMonth = portfolioCalculator.getInvestmentsByMonth();
+
       spy.mockRestore();
 
       expect(currentPositions).toEqual({
@@ -91,6 +93,11 @@ describe('PortfolioCalculator', () => {
         ],
         totalInvestment: new Big('75.80')
       });
+
+      expect(investmentsByMonth).toEqual([
+        { date: '2022-03-01', investment: new Big('151.6') },
+        { date: '2022-04-01', investment: new Big('-85.73') }
+      ]);
     });
   });
 });