public async Task GetArticlesGroupsByDateAsync_ReturnCountOfArticlesGroupedByDate_WhenGetData()
{
// Arrange
m_MockArticlesSourceService.Setup(service => service.GetDataAsync(SECTION)).ReturnsAsync(ARTICLE_SOURCES.ToList());
var articlesService = new ArticlesService(m_MockArticlesSourceService.Object);
var expectedArticleGroups = ARTICLE_SOURCES.GroupBy(sourceArticle => sourceArticle.UpdatedDate.Date)
.Select(group => (group.Key.ToString(DATE_FORMAT), group.Count())).ToList();
// Act
var articleGroups = await articlesService.GetArticlesGroupsByDateAsync(SECTION, DATE_FORMAT);
// Assert
m_MockArticlesSourceService.Verify(service => service.GetDataAsync(SECTION), Times.Once);
Assert.Equal(expectedArticleGroups, articleGroups);
}