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POModel depends on two repositories. How to mock one of them?
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  1. POModel depends on two repositories. How to mock one of them?
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    copied!<p>I have a <code>Project</code> entity that has a set of <code>Word</code> entities within. My <code>WordsRepository</code> depends on the <code>Project</code> entity. It should operate over the set of words that the project includes.</p> <pre><code>public interface IWordsRepository { List&lt;Word&gt; FetchAll(); } public class WordsRepository : IWordsRepository { private readonly Project _project; public WordsRepository(Project project) { if (project == null) throw new ArgumentNullException("project"); this._project = project; } public List&lt;Word&gt; FetchAll() { // code for retrieveing words for the project from the database } } </code></pre> <p>Now let's dig a little deeper. Here is my <code>ProjectsModel</code>. </p> <pre><code>public class ProjectsModel { private readonly IProjectsRepository _rep; private IWordsRepository _wordsRep; private IProjectsModelObserver _presenter; // Regular contructor for usual purpose public ProjectsModel() { this._rep = new ProjectsRepository(Program.context); } public ProjectsModel(IProjectsRepository repository) { this._rep = repository; } public virtual void AttachPresenter(IProjectsModelObserver observer) { this._presenter = observer; } public List&lt;Project&gt; projects { get { List&lt;Project&gt; tmpList = _rep.FetchAll(); return (tmpList != null) ? tmpList : new List&lt;Project&gt;(); } } private Project _selectedProject; public Project selectedProject { get { if (_selectedProject == null) _selectedProject = projects.FirstOrDefault(); return _selectedProject; } set { if (!projects.Contains(value)) throw new InvalidOperationException("Project not in the Projects list"); _selectedProject = projects[projects.IndexOf(value)]; // Recreating Words repository depending on project // Here is my issue: // As I should recreate the Words repository here, passing a new selected project // how can I mock it and make this class testable? this._wordsRep = new WordsRepository(this._selectedProject); if (this._presenter != null) this._presenter.SelectedProjectChanged(_selectedProject); } } private List&lt;Word&gt; _words; public List&lt;Word&gt; Words { get { // Fetching set of words in Project. Just invoking a words repository } } } </code></pre> <p>When the model's selected project is changed, it should recreate the <code>WordsRepository</code>, but it isn't testable this way. </p> <p>How can I mock it?</p>
 

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