Add StatCommandTest.java

src/test/java/seedu/address/logic/commands/StatCommandTest.java

@@ -0,0 +1,52 @@
+package seedu.address.logic.commands;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.fail;
+import static seedu.address.logic.commands.CommandTestUtil.VALID_NAME_AMY;
+import static seedu.address.logic.commands.CommandTestUtil.VALID_PHONE_NUMBER_AMY;
+import static seedu.address.testutil.Assert.assertThrows;
+import static seedu.address.testutil.TypicalIndexes.INDEX_FIRST_PRODUCT;
+
+import java.time.LocalDate;
+import java.util.HashSet;
+
+import org.junit.jupiter.api.Test;
+
+import seedu.address.logic.commands.exceptions.CommandException;
+import seedu.address.model.Model;
+import seedu.address.model.ModelManager;
+import seedu.address.model.client.PhoneNumber;
+import seedu.address.model.commons.ID;
+import seedu.address.model.commons.Name;
+import seedu.address.model.order.Order;
+import seedu.address.model.product.Quantity;
+
+public class StatCommandTest {
+    private Model model = new ModelManager();
+
+    @Test
+    public void execute_noStatistics_throwCommandException() {
+        StatCommand statCommand = new StatCommand();
+        assertThrows(CommandException.class, StatCommand.MESSAGE_FAILURE, () -> statCommand.execute(model));
+    }
+
+    @Test
+    public void execute_hasStatistics_success() {
+        AddClientCommand.AddClientDescriptor descriptor = new AddClientCommand.AddClientDescriptor(
+                new Name(VALID_NAME_AMY), new PhoneNumber(VALID_PHONE_NUMBER_AMY));
+        Order order = new Order(new ID(INDEX_FIRST_PRODUCT.getOneBased()), new Quantity("1"), LocalDate.now());
+        HashSet<Order> orders = new HashSet<>();
+        orders.add(order);
+        descriptor.setOrders(orders);
+        AddClientCommand addClientCommand = new AddClientCommand(descriptor);
+        try {
+            addClientCommand.execute(model);
+            StatCommand statCommand = new StatCommand();
+            String actualFeedback = statCommand.execute(model).getFeedbackToUser();
+            String expectedFeedback = StatCommand.MESSAGE_SUCCESS;
+            assertEquals(expectedFeedback, actualFeedback);
+        } catch (CommandException e) {
+            fail();
+        }
+    }
+}