diff --git a/Directory.Packages.props b/Directory.Packages.props
index 3ef1f4bb..3f941964 100644
--- a/Directory.Packages.props
+++ b/Directory.Packages.props
@@ -1,6 +1,6 @@
 <Project>
   <ItemGroup>
-    <PackageVersion Include="altcover" Version="8.8.74" />
+    <PackageVersion Include="altcover" Version="8.8.173" />
     <PackageVersion Include="BenchmarkDotNet" Version="0.14.0" />
     <PackageVersion Include="Bullseye" Version="5.0.0" />
     <PackageVersion Include="GraphQL.Client" Version="6.0.0" />
diff --git a/tests/Speckle.Objects.Tests.Unit/packages.lock.json b/tests/Speckle.Objects.Tests.Unit/packages.lock.json
index 6b3de7b8..2681856b 100644
--- a/tests/Speckle.Objects.Tests.Unit/packages.lock.json
+++ b/tests/Speckle.Objects.Tests.Unit/packages.lock.json
@@ -4,9 +4,9 @@
     "net8.0": {
       "altcover": {
         "type": "Direct",
-        "requested": "[8.8.74, )",
-        "resolved": "8.8.74",
-        "contentHash": "e8RZNE0vZnuBk/gOAWu9K5wm3S7dOrOlZje3PHI9PJUHqvP1cxVJD1eXAAmddFVlixowB7C7/zvC16GnunC2LQ=="
+        "requested": "[8.8.173, )",
+        "resolved": "8.8.173",
+        "contentHash": "iejmqWdC9H9ShTtsT7vSLpZ74RG4sDhheW7wllczXWl6WZAaCqGXMFGRRHi8TZGCzV/7Ah5gjXZ4GRlfAef4Eg=="
       },
       "GitVersion.MsBuild": {
         "type": "Direct",
diff --git a/tests/Speckle.Sdk.Serialization.Tests/packages.lock.json b/tests/Speckle.Sdk.Serialization.Tests/packages.lock.json
index 6b3de7b8..2681856b 100644
--- a/tests/Speckle.Sdk.Serialization.Tests/packages.lock.json
+++ b/tests/Speckle.Sdk.Serialization.Tests/packages.lock.json
@@ -4,9 +4,9 @@
     "net8.0": {
       "altcover": {
         "type": "Direct",
-        "requested": "[8.8.74, )",
-        "resolved": "8.8.74",
-        "contentHash": "e8RZNE0vZnuBk/gOAWu9K5wm3S7dOrOlZje3PHI9PJUHqvP1cxVJD1eXAAmddFVlixowB7C7/zvC16GnunC2LQ=="
+        "requested": "[8.8.173, )",
+        "resolved": "8.8.173",
+        "contentHash": "iejmqWdC9H9ShTtsT7vSLpZ74RG4sDhheW7wllczXWl6WZAaCqGXMFGRRHi8TZGCzV/7Ah5gjXZ4GRlfAef4Eg=="
       },
       "GitVersion.MsBuild": {
         "type": "Direct",
diff --git a/tests/Speckle.Sdk.Tests.Integration/Api/GraphQL/Resources/SubscriptionResourceTests.cs b/tests/Speckle.Sdk.Tests.Integration/Api/GraphQL/Resources/SubscriptionResourceTests.cs
index 784f9ee6..4cf9ec3b 100644
--- a/tests/Speckle.Sdk.Tests.Integration/Api/GraphQL/Resources/SubscriptionResourceTests.cs
+++ b/tests/Speckle.Sdk.Tests.Integration/Api/GraphQL/Resources/SubscriptionResourceTests.cs
@@ -6,7 +6,7 @@
 namespace Speckle.Sdk.Tests.Integration.API.GraphQL.Resources;
 
 [TestOf(typeof(SubscriptionResource))]
-public class SubscriptionResourceTests
+public class SubscriptionResourceTests : IDisposable
 {
   private const int WAIT_PERIOD = 300;
   private Client _testUser;
@@ -117,4 +117,7 @@ public async Task ProjectCommentsUpdated_SubscriptionIsCalled()
     Assert.That(subscriptionMessage, Is.Not.Null);
     Assert.That(subscriptionMessage!.id, Is.EqualTo(created.id));
   }
+
+  [OneTimeTearDown]
+  public void Dispose() => _testUser.Dispose();
 }
diff --git a/tests/Speckle.Sdk.Tests.Integration/packages.lock.json b/tests/Speckle.Sdk.Tests.Integration/packages.lock.json
index ce249d81..c31c21b1 100644
--- a/tests/Speckle.Sdk.Tests.Integration/packages.lock.json
+++ b/tests/Speckle.Sdk.Tests.Integration/packages.lock.json
@@ -4,9 +4,9 @@
     "net8.0": {
       "altcover": {
         "type": "Direct",
-        "requested": "[8.8.74, )",
-        "resolved": "8.8.74",
-        "contentHash": "e8RZNE0vZnuBk/gOAWu9K5wm3S7dOrOlZje3PHI9PJUHqvP1cxVJD1eXAAmddFVlixowB7C7/zvC16GnunC2LQ=="
+        "requested": "[8.8.173, )",
+        "resolved": "8.8.173",
+        "contentHash": "iejmqWdC9H9ShTtsT7vSLpZ74RG4sDhheW7wllczXWl6WZAaCqGXMFGRRHi8TZGCzV/7Ah5gjXZ4GRlfAef4Eg=="
       },
       "GitVersion.MsBuild": {
         "type": "Direct",
@@ -233,7 +233,7 @@
           "Shouldly": "[4.2.1, )",
           "Speckle.DoubleNumerics": "[4.0.1, )",
           "Speckle.Sdk": "[1.0.0, )",
-          "altcover": "[8.8.74, )"
+          "altcover": "[8.8.173, )"
         }
       },
       "GraphQL.Client": {
diff --git a/tests/Speckle.Sdk.Tests.Unit/Common/NotNullTests.cs b/tests/Speckle.Sdk.Tests.Unit/Common/NotNullTests.cs
index 680cf666..169b36cf 100644
--- a/tests/Speckle.Sdk.Tests.Unit/Common/NotNullTests.cs
+++ b/tests/Speckle.Sdk.Tests.Unit/Common/NotNullTests.cs
@@ -43,6 +43,20 @@ public async Task NotNullStruct_Task()
     t.ShouldBe(2);
   }
 
+  [Test]
+  public async Task NotNullClass_ValueTask()
+  {
+    var t = await NotNullExtensions.NotNull(ValueTask.FromResult<string?>("test"));
+    t.ShouldNotBeNull().ShouldBe("test");
+  }
+
+  [Test]
+  public async Task NotNullStruct_ValueTask()
+  {
+    var t = await NotNullExtensions.NotNull(ValueTask.FromResult<int?>(2));
+    t.ShouldBe(2);
+  }
+
   [Test]
   public void NotNullClass_Exception() =>
     Assert.Throws<ArgumentNullException>(() => NotNullExtensions.NotNull((string?)null));
@@ -58,4 +72,16 @@ public void NotNullClass_Task_Exception() =>
   [Test]
   public void NotNullStruct_Task_Exception() =>
     Assert.ThrowsAsync<ArgumentNullException>(() => NotNullExtensions.NotNull(Task.FromResult((int?)null)));
+
+  [Test]
+  public void NotNullClass_ValueTask_Exception() =>
+    Assert.ThrowsAsync<ArgumentNullException>(
+      async () => await NotNullExtensions.NotNull(ValueTask.FromResult((string?)null))
+    );
+
+  [Test]
+  public void NotNullStruct_ValueTask_Exception() =>
+    Assert.ThrowsAsync<ArgumentNullException>(
+      async () => await NotNullExtensions.NotNull(ValueTask.FromResult((int?)null))
+    );
 }
diff --git a/tests/Speckle.Sdk.Tests.Unit/Common/UnitsTest.cs b/tests/Speckle.Sdk.Tests.Unit/Common/UnitsTest.cs
index 054c5601..938d3a7e 100644
--- a/tests/Speckle.Sdk.Tests.Unit/Common/UnitsTest.cs
+++ b/tests/Speckle.Sdk.Tests.Unit/Common/UnitsTest.cs
@@ -8,11 +8,15 @@ public class UnitsTest
 {
   private const double EPS = 0.00022;
 
+  public static List<string> OfficiallySupportedUnits => Units.SupportedUnits;
+  public static List<string> NotSupportedUnits => ["feeters", "liters", "us_ft"];
+  public static List<string?> ConversionSupport => [.. Units.SupportedUnits, null];
+
   [Test, Combinatorial]
   [DefaultFloatingPointTolerance(EPS)]
   public void TestUnitConversion(
-    [ValueSource(typeof(Units), nameof(Units.SupportedUnits))] string from,
-    [ValueSource(typeof(Units), nameof(Units.SupportedUnits))] string to
+    [ValueSource(nameof(ConversionSupport))] string? from,
+    [ValueSource(nameof(ConversionSupport))] string? to
   )
   {
     var forwards = Units.GetConversionFactor(from, to);
@@ -24,4 +28,43 @@ public void TestUnitConversion(
       $"Behaviour says that 1{from} == {forwards}{to}, and 1{to} == {backwards}{from}"
     );
   }
+
+  [TestCaseSource(nameof(OfficiallySupportedUnits))]
+  public void IsUnitSupported_ReturnsTrue_AllSupportedUnits(string unit)
+  {
+    bool res = Units.IsUnitSupported(unit);
+    Assert.That(res, Is.True);
+  }
+
+  [TestCaseSource(nameof(NotSupportedUnits))]
+  public void IsUnitSupported_ReturnsFalse_NotSupportedUnits(string unit)
+  {
+    bool res = Units.IsUnitSupported(unit);
+    Assert.That(res, Is.False);
+  }
+
+  [TestCaseSource(nameof(OfficiallySupportedUnits))]
+  public void GetUnitsFromString_ReturnsSupported(string unit)
+  {
+    var lower = Units.GetUnitsFromString(unit);
+    var upper = Units.GetUnitsFromString(unit?.ToUpperInvariant());
+
+    Assert.That(lower, Is.EqualTo(unit));
+    Assert.That(upper, Is.EqualTo(unit));
+  }
+
+  [TestCaseSource(nameof(NotSupportedUnits))]
+  public void GetUnitsFromString_ThrowsUnSupported(string unit)
+  {
+    Assert.Throws<ArgumentOutOfRangeException>(() => _ = Units.GetUnitsFromString(unit));
+  }
+
+  [TestCaseSource(nameof(OfficiallySupportedUnits))]
+  public void UnitEncoding_RoundTrip(string unit)
+  {
+    var encoded = Units.GetEncodingFromUnit(unit);
+    var res = Units.GetUnitFromEncoding(encoded);
+
+    Assert.That(res, Is.EqualTo(unit));
+  }
 }
diff --git a/tests/Speckle.Sdk.Tests.Unit/packages.lock.json b/tests/Speckle.Sdk.Tests.Unit/packages.lock.json
index 2dd713eb..c012b969 100644
--- a/tests/Speckle.Sdk.Tests.Unit/packages.lock.json
+++ b/tests/Speckle.Sdk.Tests.Unit/packages.lock.json
@@ -4,9 +4,9 @@
     "net8.0": {
       "altcover": {
         "type": "Direct",
-        "requested": "[8.8.74, )",
-        "resolved": "8.8.74",
-        "contentHash": "e8RZNE0vZnuBk/gOAWu9K5wm3S7dOrOlZje3PHI9PJUHqvP1cxVJD1eXAAmddFVlixowB7C7/zvC16GnunC2LQ=="
+        "requested": "[8.8.173, )",
+        "resolved": "8.8.173",
+        "contentHash": "iejmqWdC9H9ShTtsT7vSLpZ74RG4sDhheW7wllczXWl6WZAaCqGXMFGRRHi8TZGCzV/7Ah5gjXZ4GRlfAef4Eg=="
       },
       "GitVersion.MsBuild": {
         "type": "Direct",