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c#uwpmstest

MSTest code coverage returns empty in UWP Application

I have a problem with the code coverage of MSTest in my UWP Application. Every time I try to run a coverage I get this result: Empty results generated: No binaries were instrumented. Make sure the tests ran, required binaries were loaded, had matching symbol files, and were not excluded through custom settings. For more information see https://go.microsoft.com/fwlink/?LinkID=253731

I have followed all the different troubleshooting things in the link above. But they don't seem to resolve it. I do not know what is causing this but here is some information related to my environment.

References of my Test project:

enter image description here

The *.pdb files of my references are present in the build directory of my Test project.

[TestClass]
    public class UnitModelTests
    {
        [DataTestMethod]

        #region Metric

        [DataRow(LengthMetric.MM, "1mm", UnitType.Metric)]
        [DataRow(LengthMetric.CM - LengthMetric.MM, "9mm", UnitType.Metric)]
        [DataRow(LengthMetric.CM, "1cm", UnitType.Metric)]
        [DataRow(LengthMetric.DM - LengthMetric.CM, "9cm", UnitType.Metric)]
        [DataRow(LengthMetric.DM, "1dm", UnitType.Metric)]
        [DataRow(LengthMetric.M - LengthMetric.DM, "9dm", UnitType.Metric)]
        [DataRow(LengthMetric.M, "1m", UnitType.Metric)]
        [DataRow(LengthMetric.KM - LengthMetric.M, "999m", UnitType.Metric)]
        [DataRow(LengthMetric.KM, "1km", UnitType.Metric)]
        [DataRow(LengthMetric.KM * 100, "100km", UnitType.Metric)]

        #endregion

        #region Imperial

        [DataRow(LengthImperial.Inch, "1 inch", UnitType.Imperial)]
        [DataRow(LengthImperial.Feet, "1 feet", UnitType.Imperial)]
        [DataRow(LengthImperial.Yard, "1 yard", UnitType.Imperial)]
        [DataRow(LengthImperial.Chain, "1 chain", UnitType.Imperial)]
        [DataRow(LengthImperial.Furlong, "1 furlong", UnitType.Imperial)]
        [DataRow(LengthImperial.Mile, "1 mile", UnitType.Imperial)]
        [DataRow(LengthImperial.League, "1 league", UnitType.Imperial)]

        #endregion

        public void LengthToStringTest(double startLength, string expected, UnitType unitType)
        {
            var length = new Length(startLength);
            Assert.AreEqual(expected, length.UnitToString(unitType));
        }

        [DataTestMethod]

        #region Metric

        [DataRow(VolumeMetric.MM, "1mm^3", UnitType.Metric)]
        [DataRow(VolumeMetric.MM * 9, "9mm^3", UnitType.Metric)]
        [DataRow(VolumeMetric.CM, "1cm^3", UnitType.Metric)]
        [DataRow(VolumeMetric.CM * 9, "9cm^3", UnitType.Metric)]
        [DataRow(VolumeMetric.DM, "1dm^3", UnitType.Metric)]
        [DataRow(VolumeMetric.DM * 9, "9dm^3", UnitType.Metric)]
        [DataRow(VolumeMetric.M, "1m^3", UnitType.Metric)]
        [DataRow(VolumeMetric.M * 999, "999m^3", UnitType.Metric)]
        [DataRow(VolumeMetric.KM, "1km^3", UnitType.Metric)]
        [DataRow(VolumeMetric.KM * 100, "100km^3", UnitType.Metric)]

        #endregion

        #region Imperial

        [DataRow(VolumeImperial.FluidOunce, "1 Fluid ounce", UnitType.Imperial)]
        [DataRow(VolumeImperial.Gill, "1 Gill", UnitType.Imperial)]
        [DataRow(VolumeImperial.Pint, "1 Pint", UnitType.Imperial)]
        [DataRow(VolumeImperial.Quart, "1 Quart", UnitType.Imperial)]
        [DataRow(VolumeImperial.Gallon, "1 Gallon", UnitType.Imperial)]

        #endregion

        public void VolumeToStringTest(double startVolume, string expected, UnitType unitType)
        {
            var volume = new Volume(startVolume);
            Assert.AreEqual(expected, volume.UnitToString(unitType));
        }
    }

Test Results: All tests that are shown here return as successful.

Build configuration:

Build Configuration

NuGet Packages of the MSTest project: NuGet Packages

If more information is needed please leave a comment.

Solution

  • The UWP MSTest implementation currently does not support code coverage. Here is a link to a blog that talks about it. A workaround could be to change the UWP Class Libary to a .NET Standard Class Libary. Then change the UWP MSTest project to the .NET Core variant. After changing this and running the code coverage via test explorer you get the results you wanted. enter image description here

    For a better explanation about this issue, you can visit this website that talks about it. https://www.redgreencode.com/unit-testing-uwp-apps/