Added Unit Testing for Calendar Commands.

src/main/java/seedu/address/commons/stub/UiManagerStub.java

@@ -0,0 +1,41 @@
+package seedu.address.commons.stub;
+
+import seedu.address.logic.UiManager;
+import seedu.address.model.CalendarDate;
+
+/**
+ * Represents a stub for the UiManager that is used for testing purpose only.
+ * @see UiManager
+ */
+public class UiManagerStub extends UiManager {
+
+    @Override
+    public void viewCalendar(CalendarDate calendarDate) {
+        return;
+    }
+
+    @Override
+    public void viewList() {
+        return;
+    }
+
+    @Override
+    public void viewLog() {
+        return;
+    }
+
+    @Override
+    public void viewDay(CalendarDate calendarDate) {
+        return;
+    }
+
+    @Override
+    public void viewWeek(CalendarDate calendarDate) {
+        return;
+    }
+
+    @Override
+    public void viewMonth(CalendarDate calendarDate) {
+        return;
+    }
+}

src/main/java/seedu/address/logic/commands/CalendarViewCommandBuilder.java

@@ -30,7 +30,6 @@ RequiredArgumentList defineCommandArguments() {
         return null;
     }
 
-    // TODO: Currently has a bug when typing "calendar" only. Either add new command or fix this.
     @Override
     Map<String, OptionalArgumentList> defineCommandOptions() {
         return Map.of(

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

@@ -0,0 +1,36 @@
+package seedu.address.logic.commands;
+
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+import static seedu.address.logic.commands.CalendarViewCommandBuilder.OPTION_CALENDAR_SCREEN_DATE;
+
+import org.junit.jupiter.api.Test;
+
+import seedu.address.commons.stub.UiManagerStub;
+
+class CalendarViewCommandTest {
+    @Test
+    void build_fullCommand_success() {
+        String calendarDate = "11/1111";
+        assertDoesNotThrow(() -> {
+            UiManagerStub uiManager = new UiManagerStub();
+            Command command = CalendarViewCommand.newBuilder(uiManager)
+                    .acceptSentence(OPTION_CALENDAR_SCREEN_DATE)
+                    .acceptSentence(calendarDate)
+                    .build();
+
+            command.execute();
+        });
+
+    }
+
+    @Test
+    void build_emptyCommand_success() {
+        assertDoesNotThrow(() -> {
+            UiManagerStub uiManager = new UiManagerStub();
+            Command command = CalendarViewCommand.newBuilder(uiManager)
+                    .build();
+
+            command.execute();
+        });
+    }
+}

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

@@ -0,0 +1,39 @@
+package seedu.address.logic.commands;
+
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import org.junit.jupiter.api.Test;
+
+import seedu.address.commons.stub.UiManagerStub;
+import seedu.address.logic.UiManager;
+import seedu.address.logic.commands.exceptions.ArgumentException;
+
+class DayViewCommandTest {
+
+    @Test
+    void build_fullCommand_success() {
+        String calendarDate = "11/11/1111";
+        assertDoesNotThrow(() -> {
+            UiManagerStub uiManager = new UiManagerStub();
+
+            Command command = DayViewCommand.newBuilder(uiManager)
+                    .acceptSentence(calendarDate)
+                    .build();
+
+            command.execute();
+        });
+    }
+
+    @Test
+    void execute_emptyCommand_failure() {
+        assertThrows(ArgumentException.class, () -> {
+            UiManager uiManager = new UiManager();
+
+            Command command = DayViewCommand.newBuilder(uiManager)
+                    .build();
+
+            command.execute();
+        });
+    }
+}

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

@@ -0,0 +1,22 @@
+package seedu.address.logic.commands;
+
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+
+import org.junit.jupiter.api.Test;
+
+import seedu.address.commons.stub.UiManagerStub;
+
+class ListViewCommandTest {
+
+    @Test
+    void build_fullCommand_success() {
+        assertDoesNotThrow(() -> {
+            UiManagerStub uiManager = new UiManagerStub();
+            Command command = ListViewCommand.newBuilder(uiManager)
+                    .build();
+
+            command.execute();
+        });
+
+    }
+}

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

@@ -0,0 +1,22 @@
+package seedu.address.logic.commands;
+
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+
+import org.junit.jupiter.api.Test;
+
+import seedu.address.commons.stub.UiManagerStub;
+
+class LogViewCommandTest {
+
+    @Test
+    void build_fullCommand_success() {
+        assertDoesNotThrow(() -> {
+            UiManagerStub uiManager = new UiManagerStub();
+            Command command = LogViewCommand.newBuilder(uiManager)
+                    .build();
+
+            command.execute();
+        });
+
+    }
+}

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

@@ -0,0 +1,39 @@
+package seedu.address.logic.commands;
+
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import org.junit.jupiter.api.Test;
+
+import seedu.address.commons.stub.UiManagerStub;
+import seedu.address.logic.UiManager;
+import seedu.address.logic.commands.exceptions.ArgumentException;
+
+class MonthViewCommandTest {
+
+    @Test
+    void build_fullCommand_success() {
+        String calendarDate = "11/1111";
+        assertDoesNotThrow(() -> {
+            UiManagerStub uiManager = new UiManagerStub();
+
+            Command command = MonthViewCommand.newBuilder(uiManager)
+                    .acceptSentence(calendarDate)
+                    .build();
+
+            command.execute();
+        });
+    }
+
+    @Test
+    void execute_emptyCommand_failure() {
+        assertThrows(ArgumentException.class, () -> {
+            UiManager uiManager = new UiManager();
+
+            Command command = MonthViewCommand.newBuilder(uiManager)
+                    .build();
+
+            command.execute();
+        });
+    }
+}

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

@@ -0,0 +1,39 @@
+package seedu.address.logic.commands;
+
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import org.junit.jupiter.api.Test;
+
+import seedu.address.commons.stub.UiManagerStub;
+import seedu.address.logic.UiManager;
+import seedu.address.logic.commands.exceptions.ArgumentException;
+
+class WeekViewCommandTest {
+
+    @Test
+    void build_fullCommand_success() {
+        String calendarDate = "11/11/1111";
+        assertDoesNotThrow(() -> {
+            UiManagerStub uiManager = new UiManagerStub();
+
+            Command command = WeekViewCommand.newBuilder(uiManager)
+                    .acceptSentence(calendarDate)
+                    .build();
+
+            command.execute();
+        });
+    }
+
+    @Test
+    void execute_emptyCommand_failure() {
+        assertThrows(ArgumentException.class, () -> {
+            UiManager uiManager = new UiManager();
+
+            Command command = WeekViewCommand.newBuilder(uiManager)
+                    .build();
+
+            command.execute();
+        });
+    }
+}