fix: restore nunit.framework reference in ThunderKit.Core.Tests.asmdef

CHANGELOG.md

@@ -17,6 +17,13 @@
   `#search-input` now absorbs the flex/shrink so the `EnumFlagsField` and help
   button keep their natural size instead of colliding
 
+### Tests
+
+* [ThunderKit.Core.Tests](Tests/Editor/ThunderKit.Core.Tests.asmdef) now declares
+  `nunit.framework.dll` as a precompiled reference instead of an assembly definition
+  reference, so the test assembly resolves on Unity 2018.4.12 — the minimum editor
+  version declared in `package.json`
+
 ### Community Contributions
 
 * Thanks to @jan-bures for adding conditional compilation for Unity version

Tests/Editor/ThunderKit.Core.Tests.asmdef

@@ -4,8 +4,7 @@
         "ThunderKit.Core",
         "ThunderKit.Common",
         "ThunderKit.Markdown",
-        "ThunderKit.Thunderstore",
-        "nunit.framework"
+        "ThunderKit.Thunderstore"
     ],
     "optionalUnityReferences": [
         "TestAssemblies"
@@ -17,7 +16,8 @@
     "allowUnsafeCode": false,
     "overrideReferences": true,
     "precompiledReferences": [
-        "AssetsTools.NET.dll"
+        "AssetsTools.NET.dll",
+        "nunit.framework.dll"
     ],
     "autoReferenced": true,
     "defineConstraints": []