Unit Tests for hot spots (#1454)

* Add TaxInfoTests

* Add UserTests

* Add SendServicTests

* Added IconFetchingServicesTests

* Add endline

test/Core.Test/Models/Tables/UserTests.cs

@@ -0,0 +1,43 @@
+using Bit.Core.Models.Table;
+using Xunit;
+
+namespace Bit.Core.Test.Models.Tables
+{
+    public class UserTests
+    {
+        //                              KB     MB     GB
+        public const long Multiplier = 1024 * 1024 * 1024;
+
+        [Fact]
+        public void StorageBytesRemaining_HasMax_DoesNotHaveStorage_ReturnsMaxAsBytes()
+        {
+            short maxStorageGb = 1;
+
+            var user = new User
+            {
+                MaxStorageGb = maxStorageGb,
+                Storage = null,
+            };
+
+            var bytesRemaining = user.StorageBytesRemaining();
+
+            Assert.Equal(bytesRemaining, maxStorageGb * Multiplier);
+        }
+
+        [Theory]
+        [InlineData(2, 1 * Multiplier, 1 * Multiplier)]
+
+        public void StorageBytesRemaining_HasMax_HasStorage_ReturnRemainingStorage(short maxStorageGb, long storageBytes, long expectedRemainingBytes)
+        {
+            var user = new User
+            {
+                MaxStorageGb = maxStorageGb,
+                Storage = storageBytes,
+            };
+
+            var bytesRemaining = user.StorageBytesRemaining();
+
+            Assert.Equal(expectedRemainingBytes, bytesRemaining);
+        }
+    }
+}