BigramTests.cs

[TestFixture]
    public class BigramTests
    {
        [Theory]
        [TestCaseSource(nameof(Create_ReturnsCorrect_NumberOfBrigams_TestData))]
        public void Create_ReturnsCorrect_NumberOfBrigams(string input, Dictionary<string, int> actual)
        {
            var sut = Bigram.GetHistogramData(input);

            sut.Count().Should().Be(actual.Count);
        }


        static IEnumerable<object[]> Create_ReturnsCorrect_NumberOfBrigams_TestData()
        {
            var testString = "The quick brown fox and the quick blue hare";
            var bigram = new Dictionary<string, int>()
            {
                { "the quick", 2 },
                { "quick brown", 1 },
                { "brown fox", 1 },
                { "fox and", 1 },
                { "and the", 1 },
                { "quick blue", 1 },
                { "blue hare", 1 }
            };

            return new[] { new object[] { testString, bigram }, };
        }

    }