diff --git a/tests/SwaggerProvider.Tests/RuntimeHelpersTests.fs b/tests/SwaggerProvider.Tests/RuntimeHelpersTests.fs
index e36ee868..c86ba985 100644
--- a/tests/SwaggerProvider.Tests/RuntimeHelpersTests.fs
+++ b/tests/SwaggerProvider.Tests/RuntimeHelpersTests.fs
@@ -38,6 +38,31 @@ module ToParamTests =
         let result = toParam(box 42)
         result |> shouldEqual "42"
 
+    [<Fact>]
+    let ``toParam uses ToString for int64``() =
+        let result = toParam(box 9876543210L)
+        result |> shouldEqual "9876543210"
+
+    [<Fact>]
+    let ``toParam uses ToString for bool true``() =
+        let result = toParam(box true)
+        result |> shouldEqual "True"
+
+    [<Fact>]
+    let ``toParam uses ToString for bool false``() =
+        let result = toParam(box false)
+        result |> shouldEqual "False"
+
+    [<Fact>]
+    let ``toParam uses ToString for float32``() =
+        let result = toParam(box 3.14f)
+        result |> shouldContainText "3.14"
+
+    [<Fact>]
+    let ``toParam uses ToString for double``() =
+        let result = toParam(box 2.718281828)
+        result |> shouldContainText "2.718"
+
     [<Fact>]
     let ``toParam uses ToString for strings``() =
         let result = toParam(box "hello world")
@@ -843,6 +868,21 @@ module FormatObjectTests =
         let obj = FmtArray([||])
         formatObject obj |> shouldEqual "{Tags=[]}"
 
+    [<Fact>]
+    let ``formatObject formats array with null element as null``() =
+        let obj = FmtArray([| null |])
+        formatObject obj |> shouldEqual "{Tags=[null]}"
+
+    [<Fact>]
+    let ``formatObject formats array with mixed null and non-null elements``() =
+        let obj = FmtArray([| "a"; null; "b" |])
+        formatObject obj |> shouldEqual "{Tags=[a; null; b]}"
+
+    [<Fact>]
+    let ``formatObject formats object with no properties as empty braces``() =
+        let obj = System.Object()
+        formatObject obj |> shouldEqual "{}"
+
     [<Fact>]
     let ``formatObject sorts properties alphabetically``() =
         // Age < Name alphabetically