tests: Add tests on ToString() and conversions

Author: angularsen

UnitsNet.Tests/QuantityTests.Ctor.cs

@@ -43,6 +43,24 @@ public void DefaultCtorOfRepresentativeTypes_SetsValueToZeroAndUnitToBaseUnit()
                 Assert.Equal(LevelUnit.Decibel, new Level().Unit);
             }
 
+            /// <summary>
+            ///     This test is a bit misplaced, but was added because when working on #389 unit+value there were two
+            ///     ways to implement this; either assume BaseUnit of unit is not specified or throw if quantity did not have unit explicitly set.
+            ///     Struct types do not allow custom default ctor implementations, so that exception would then be thrown when trying to convert.
+            /// </summary>
+            [Fact]
+            public void DefaultCtorOfRepresentativeTypes_DoesNotThrowWhenConvertingToOtherUnits()
+            {
+                // double types
+                Assert.Equal(0, new Mass().Hectograms);
+
+                // decimal types
+                Assert.Equal(0, new Information().Kibibits);
+
+                // logarithmic types
+                Assert.Equal(0, new Level().Nepers);
+            }
+
             [Fact]
             public void CtorWithOnlyValueOfRepresentativeTypes_SetsValueToGivenValueAndUnitToBaseUnit()
             {

UnitsNet.Tests/QuantityTests.ToString.cs

@@ -29,6 +29,55 @@ public partial class QuantityTests
     {
         public class ToString
         {
+            [Fact]
+            public void CreatedByDefaultCtor_ReturnsValueInBaseUnit()
+            {
+                // double types
+                Assert.Equal("0 kg", new Mass().ToString());
+
+                // decimal types
+                Assert.Equal("0 b", new Information().ToString());
+
+                // logarithmic types
+                Assert.Equal("0 dB", new Level().ToString());
+            }
+
+            [Fact]
+            public void CreatedByCtorWithValue_ReturnsValueInBaseUnit()
+            {
+#pragma warning disable 618
+                // double types
+                Assert.Equal("5 kg", new Mass(5L).ToString());
+                Assert.Equal("5 kg", new Mass(5d).ToString());
+                Assert.Equal("5 kg", new Mass(5m).ToString());
+
+                // decimal types
+                Assert.Equal("5 b", new Information(5L).ToString());
+                Assert.Equal("5 b", new Information(5d).ToString());
+                Assert.Equal("5 b", new Information(5m).ToString());
+
+                // logarithmic types
+                Assert.Equal("5 dB", new Level(5L).ToString());
+                Assert.Equal("5 dB", new Level(5d).ToString());
+                Assert.Equal("5 dB", new Level(5m).ToString());
+#pragma warning restore 618
+            }
+
+            [Fact]
+            public void CreatedByCtorWithValueAndUnit_ReturnsValueAndUnit()
+            {
+#pragma warning disable 618
+                // double types
+                Assert.Equal("50 hg", new Mass(5).ToString(MassUnit.Hectogram));
+
+                // decimal types
+                Assert.Equal("1 B", new Information(8).ToString(InformationUnit.Byte));
+
+                // logarithmic types
+                Assert.Equal("0.58 Np", new Level(5).ToString(LevelUnit.Neper));
+#pragma warning restore 618
+            }
+
             [Fact]
             public void ReturnsTheOriginalValueAndUnit()
             {