First runnable tests for Database / Commented out Good/BadCasesTests (not relevant to this branch)

test/hhn/temp/project/DatabaseBadCasesTest.java

@@ -0,0 +1,39 @@
+package hhn.temp.project;
+
+import hhn.temp.project.provider.DatabaseManager;
+import hhn.temp.project.provider.SimpleDatabaseManager;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import java.sql.SQLException;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class DatabaseBadCasesTest {
+
+  private DatabaseManager<DatabaseGoodCasesTest.TestClass> databaseManager;
+
+  public class TestClass {
+    private int id;
+    private String dataString;
+    private int dataInteger;
+
+    public TestClass(int id, String dataString, int dataInteger) {
+      this.id = id;
+      this.dataString = dataString;
+      this.dataInteger = dataInteger;
+    }
+  }
+
+  @BeforeEach
+  public void setup() {
+    databaseManager = new SimpleDatabaseManager<>();
+  }
+
+  @Test
+  @DisplayName("Assert connection failed")
+  public void assertConnectionFailed() {
+    assertThrows(SQLException.class, () -> databaseManager.connect());
+  }
+}