Unit test for running a custom MSBuild task.

MSBuildParameterLoggingTests.cs

        [TestMethod]
        public void RequiredInputGetsLogged()
        {
            var buildTarget = CreateBuildTarget();

            buildTarget.AddTask<TaskWithRequiredInput>().SetParameter("Foo", "hi");

            const string expected = @"Inputs:
  Foo = hi
";
            AssertTargettOutput(expected, buildTarget);
        }

        private ProjectTargetElement CreateBuildTarget()
        {
            var buildTarget = ProjectRootElement.Create().AddTarget("Build");
            return buildTarget;
        }

        private static void AssertTargettOutput(string expected, ProjectTargetElement projectTargetElement)
        {
            var highImportanceStringLogger = new HighImportanceStringLogger();

            var success = new ProjectInstance(projectTargetElement.ContainingProject).Build(new[] { highImportanceStringLogger });
            Assert.IsTrue(success);

            Assert.AreEqual(expected, highImportanceStringLogger.ToString());
        }