Unit Test for CreateDatabaseConnection method

Question

Using: Microsoft Unit Testing Framework integrated with VS2010

I have a class that implements this interface.

public interface IConnectionManager
{
    IDbConnection OpenDatabase(string path);
    void CloseDatabase();
}

I would like to create a set of Tests for these methods but not quite sure how to proceed.

What is the best way to test this?

Thanks.

EDIT:

My OpenDatabase implementation looks something like this:

    public OleDbConnection OpenDatabase (string p_path)
    {
        if (Library.StringOperations.IsNullOrEmpty (p_path))
            return null;

        bool error = false;
        string  connectionString= @"CONNECTION STRING HERE";
        try
        {
            OleDbConnection con= new OleDbConnection (connectionString);
            con.Open ();
        }
        catch (Exception)
        {
            error = true;
        }

        if (!error)
            return con;

        return null;
    }

As suggested by @rdkleine I want to test the returned connection.

A few questions:

1. Do I need to create a new OleDbConnection object to compare with my returned object or should I check my returned connection object proprieties?

2. Can Mock Objects be used in this case?

3. Having in mind that I am testing a connection to a DB is this still Unit Testing or Integration Testing ?

Thanks again.

Answer 1

Start simple.

• Test returns connection
• Test path exists
• Test path doesn't exist
• Test can't connect
• Test can connect

etc

Read this book about TDD :)