diff --git a/run_coverage.sh b/run_coverage.sh
new file mode 100644
index 0000000..f00384e
--- /dev/null
+++ b/run_coverage.sh
@@ -0,0 +1,8 @@
+set -e
+cd "$(dirname "$0")"
+
+rm -rf coverage
+dotnet test -p:CollectCoverage=true -p:CoverletOutput="../../../coverage/" -p:MergeWith="../../../coverage/coverage.json" -p:CoverletOutputFormat=\"json,opencover\" -p:ExcludeByAttribute="GeneratedCode" -maxcpucount:1 src
+reportgenerator -reports:coverage/coverage.opencover.xml -targetdir:coverage/report
+
+# see result in coverage/report/index.html
diff --git a/src/tests/Tochka.JsonRpc.OpenRpc.Tests/Services/OpenRpcDocumentGeneratorTests.cs b/src/tests/Tochka.JsonRpc.OpenRpc.Tests/Services/OpenRpcDocumentGeneratorTests.cs
index 55b45eb..19718ce 100644
--- a/src/tests/Tochka.JsonRpc.OpenRpc.Tests/Services/OpenRpcDocumentGeneratorTests.cs
+++ b/src/tests/Tochka.JsonRpc.OpenRpc.Tests/Services/OpenRpcDocumentGeneratorTests.cs
@@ -922,7 +922,7 @@ public void CombineBindingStyles_BothObjectAndArray_ReturnEither()
             {
                 new JsonRpcControllerAttribute()
             },
-            ControllerName = controllerName,
+            ControllerName = controllerName!,
             MethodInfo = action?.Method ?? ((Action) ValidMethod).Method
         },
         Properties =