added database test

app/src/test/java/com/team34/cse_110_project_team_34/DatabaseTest.java

@@ -1,2 +1,66 @@
-package com.team34.cse_110_project_team_34;public class DatabaseTest {
-}
+package com.team34.cse_110_project_team_34;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+import android.content.Context;
+
+import androidx.test.core.app.ApplicationProvider;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import java.util.List;
+
+import database.Database;
+import database.UserDao;
+import model.User;
+
+
+@RunWith(AndroidJUnit4.class)
+public class DatabaseTest {
+
+    private UserDao userDao;
+
+    @Before
+    public void createDb() {
+        Context context = ApplicationProvider.getApplicationContext();
+        userDao = Database.getInstance(context).getUserDao();
+        Database.getInstance(context).clearAllTables();
+    }
+
+    @Test
+    public void emptyDatabaseTest() {
+        List<User> users = userDao.getAllList();
+        assertEquals(0, users.size());
+    }
+
+    @Test
+    public void oneEntryTest() {
+        User u = new User("name","public_code", 0,0);
+        userDao.upsert(u);
+
+        List<User> users = userDao.getAllList();
+        assertEquals(1, users.size());
+        assertTrue(users.get(0).equals(u));
+    }
+
+    @Test
+    public void multipleEntryTest() {
+        User u1 = new User("u1", "public1", 0,0);
+        userDao.upsert(u1);
+        User u2 = new User("u2", "public2", 0,0);
+        userDao.upsert(u2);
+        User u3 = new User("u3", "public3", 0,0);
+        userDao.upsert(u3);
+
+
+        User db1 = userDao.get("public1");
+        assertTrue(db1.equals(u1));
+        User db2 = userDao.get("public2");
+        assertTrue(db2.equals(u2));
+        User db3 = userDao.get("public3");
+        assertTrue(db3.equals(u3));
+    }
+}