diff --git a/app/src/main/java/me/panavtec/androidbankkata/account/transaction/Transaction.java b/app/src/main/java/me/panavtec/androidbankkata/account/transaction/Transaction.java
new file mode 100644
index 0000000..9ce998b
--- /dev/null
+++ b/app/src/main/java/me/panavtec/androidbankkata/account/transaction/Transaction.java
@@ -0,0 +1,9 @@
+package me.panavtec.androidbankkata.account.transaction;
+
+import java.util.Date;
+
+public class Transaction {
+  public Transaction(int amount, Date date) {
+
+  }
+}
diff --git a/app/src/main/java/me/panavtec/androidbankkata/account/transaction/TransactionRepository.java b/app/src/main/java/me/panavtec/androidbankkata/account/transaction/TransactionRepository.java
index f14bed9..b9d6284 100644
--- a/app/src/main/java/me/panavtec/androidbankkata/account/transaction/TransactionRepository.java
+++ b/app/src/main/java/me/panavtec/androidbankkata/account/transaction/TransactionRepository.java
@@ -1,4 +1,7 @@
 package me.panavtec.androidbankkata.account.transaction;
 
 public class TransactionRepository {
+  public void store(Transaction transaction) {
+    throw new UnsupportedOperationException();
+  }
 }
diff --git a/app/src/test/java/me/panavtec/androidbankkata/account/BankAccountShouldShould.java b/app/src/test/java/me/panavtec/androidbankkata/account/BankAccountShouldShould.java
new file mode 100644
index 0000000..46fa1bc
--- /dev/null
+++ b/app/src/test/java/me/panavtec/androidbankkata/account/BankAccountShouldShould.java
@@ -0,0 +1,56 @@
+package me.panavtec.androidbankkata.account;
+
+import java.util.Date;
+import me.panavtec.androidbankkata.account.statement.StatementFormatter;
+import me.panavtec.androidbankkata.account.statement.StatementView;
+import me.panavtec.androidbankkata.account.transaction.Transaction;
+import me.panavtec.androidbankkata.account.transaction.TransactionRepository;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.runners.MockitoJUnitRunner;
+
+import static org.mockito.Mockito.*;
+
+@RunWith(MockitoJUnitRunner.class) public class BankAccountShouldShould {
+
+  @Mock TransactionRepository repository;
+  @Mock StatementFormatter formatter;
+  @Mock StatementView view;
+  @Mock Clock clock;
+
+  @Test public void store_a_transaction() {
+    BankAccount account = givenAccountWithMockedClock();
+
+    account.deposit(anAmount());
+
+    verifyStore(aTransactionWith(anAmount()));
+  }
+
+  private BankAccount givenAccountWithMockedClock() {
+    when(clock.today()).thenReturn(date());
+    return givenAccount();
+  }
+
+  private Date date() {
+    return new Date();
+  }
+
+  private BankAccount givenAccount() {
+    BankAccount account = new BankAccount(repository, formatter, clock);
+    account.attach(view);
+    return account;
+  }
+
+  private int anAmount() {
+    return 100;
+  }
+
+  private Transaction aTransactionWith(int anyAmount) {
+    return new Transaction(anyAmount, date());
+  }
+
+  private void verifyStore(Transaction transaction) {
+    verify(repository).store(transaction);
+  }
+}
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