diff --git a/TDDLesson.BankAccount.Tests/BankAccountTests.cs b/TDDLesson.BankAccount.Tests/BankAccountTests.cs
index 99508d3..4c4739a 100644
--- a/TDDLesson.BankAccount.Tests/BankAccountTests.cs
+++ b/TDDLesson.BankAccount.Tests/BankAccountTests.cs
@@ -5,4 +5,153 @@
 [TestClass]
 public sealed class BankAccountTests
 {
+    [TestMethod]
+    public void AddMoneyToBankAccount_MoneySuccessfullyAdded()
+    {
+        // Arrange
+        var bankAccount = new BankAccount();
+        var money = 100;
+
+        // Act
+        bankAccount.Add(money);
+
+        // Assert
+        bankAccount.Balance.Should().Be(100);
+    }
+    
+    [TestMethod]
+    public void AddMoneyToNonEmptyBankAccount_MoneySuccessfullyAddedToExistingBalance()
+    {
+        // Arrange
+        var bankAccount = new BankAccount();
+        var money = 100;
+
+        // Act
+        bankAccount.Add(money);
+        bankAccount.Add(money);
+
+        // Assert
+        bankAccount.Balance.Should().Be(200);
+    }
+    
+    [TestMethod]
+    public void AddMoneyToNonEmptyBankAccount_NegativeMoney_ThrowInvalidOperationException()
+    {
+        // Arrange
+        var bankAccount = new BankAccount();
+        var money = -100;
+
+        // Act
+        var act = () => bankAccount.Add(money);
+
+        // Assert
+        act.Should().Throw<InvalidOperationException>();
+    }
+    
+    [TestMethod]
+    public void TakeAllMoneyFromBankAccount_MoneySuccessfullyTaken()
+    {
+        // Arrange
+        var bankAccount = new BankAccount();
+        var money = 100;
+        bankAccount.Add(money);
+        
+        // Act
+        bankAccount.Take(money);
+
+        // Assert
+        bankAccount.Balance.Should().Be(0);
+    }
+    
+    [TestMethod]
+    public void TakeSomeMoneyFromBankAccount_MoneySuccessfullyTaken()
+    {
+        // Arrange
+        var bankAccount = new BankAccount();
+        bankAccount.Add(100);
+        
+        // Act
+        bankAccount.Take(50);
+
+        // Assert
+        bankAccount.Balance.Should().Be(50);
+    }
+    
+    [TestMethod]
+    public void TakeMoreMoneyThenHaveFromBankAccount_Error_MoneyNotEnough()
+    {
+        // Arrange
+        var bankAccount = new BankAccount();
+        bankAccount.Add(50);
+        
+        // Act
+        var act = () => bankAccount.Take(100);
+
+        // Assert
+        act.Should().Throw<InvalidOperationException>();
+    }
+    
+    [TestMethod]
+    public void TakeMoneyFromBankAccount_NegativeMoney_ThrowInvalidOperationException()
+    {
+        // Arrange
+        var bankAccount = new BankAccount();
+        var money = -100;
+
+        // Act
+        var act = () => bankAccount.Take(money);
+
+        // Assert
+        act.Should().Throw<InvalidOperationException>();
+    }
+    
+    [TestMethod]
+    public void CreateBankAccount_WithoutLimit_LimitIsZero()
+    {
+        // Act
+        var bankAccount = new BankAccount();
+
+        // Assert
+        bankAccount.Limit.Should().Be(0);
+    }
+    
+    [TestMethod]
+    public void CreateBankAccount_WithLimit_LimitSetSuccessfully()
+    {
+        // Arrange
+        var limit = 1000;
+        
+        // Act
+        var bankAccount = new BankAccount(limit);
+
+        // Assert
+        bankAccount.Limit.Should().Be(limit);
+    }
+    
+    [TestMethod]
+    public void CreateBankAccount_WithNegativeLimit_ThrowInvalidOperationException()
+    {
+        // Arrange
+        var limit = -1000;
+        
+        // Act
+        var act = () => new BankAccount(limit);
+        
+        // Assert
+        act.Should().Throw<InvalidOperationException>();
+    }
+    
+    [TestMethod]
+    public void TakeMoneyCreditWithinLimit_MoneySuccessfullyTaken()
+    {
+        // Arrange
+        var bankAccount = new BankAccount(100);
+        bankAccount.Add(50);
+
+        // Act
+        bankAccount.Take(100);
+
+        // Assert
+        bankAccount.Balance.Should().Be(-50);
+    }
 }
\ No newline at end of file
diff --git a/TDDLesson.BankAccount/BankAccount.cs b/TDDLesson.BankAccount/BankAccount.cs
index cdc2e4e..acef1af 100644
--- a/TDDLesson.BankAccount/BankAccount.cs
+++ b/TDDLesson.BankAccount/BankAccount.cs
@@ -2,12 +2,32 @@
 
 public sealed class BankAccount
 {
+    public BankAccount(int limit = 0)
+    {
+        if (limit < 0)
+            throw new InvalidOperationException();
+        
+        Limit = limit;
+    }
     public int Balance { get; private set; }
 
+    public int Limit { get; }
+
     public void Add(int money)
     {
         if (money < 0) throw new InvalidOperationException();
         
-        Balance = money;
+        Balance += money;
+    }
+    
+    public void Take(int money)
+    {
+        if (money < 0) throw new InvalidOperationException();
+
+        var allMoney = Balance + Limit;
+        if (allMoney < money)
+            throw new InvalidOperationException("Money not enough");
+        
+        Balance -= money;
     }
 }
\ No newline at end of file
diff --git a/TDDLesson.sln.DotSettings.user b/TDDLesson.sln.DotSettings.user
index 12ec2da..ebcb961 100644
--- a/TDDLesson.sln.DotSettings.user
+++ b/TDDLesson.sln.DotSettings.user
@@ -1,6 +1,6 @@
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 	<s:Int64 x:Key="/Default/Environment/Hierarchy/Build/BuildTool/MsbuildVersion/@EntryValue">4294967293</s:Int64>
 	<s:String x:Key="/Default/Environment/Hierarchy/Build/BuildTool/CustomBuildToolPath/@EntryValue">/usr/local/share/dotnet/sdk/8.0.203/MSBuild.dll</s:String>
-	<s:String x:Key="/Default/Environment/UnitTesting/UnitTestSessionStore/Sessions/=46c725ae_002Dcc42_002D4ccd_002Db699_002Df44f04a3f20a/@EntryIndexedValue">&lt;SessionState ContinuousTestingMode="0" IsActive="True" Name="All tests from Solution" xmlns="urn:schemas-jetbrains-com:jetbrains-ut-session"&gt;&#xD;
-  &lt;Solution /&gt;&#xD;
+	<s:String x:Key="/Default/Environment/UnitTesting/UnitTestSessionStore/Sessions/=46c725ae_002Dcc42_002D4ccd_002Db699_002Df44f04a3f20a/@EntryIndexedValue">&lt;SessionState ContinuousTestingMode="0" IsActive="True" Name="All tests from Solution" xmlns="urn:schemas-jetbrains-com:jetbrains-ut-session"&gt;
+  &lt;Solution /&gt;
 &lt;/SessionState&gt;</s:String></wpf:ResourceDictionary>
\ No newline at end of file