         }
     }
 
-    ModelIOTests.test("MDLAnimatedMatrix4x4/accessors") {
+    ModelIOTests.test("MDLAnimatedMatrix4x4/accessors")
+    .skip(.always("rdar://problem/50449570")).code {
         let animatedVal = MDLAnimatedMatrix4x4()
         let testCount = 10
         let testTimeVal = 5.0

        }
    }

    ModelIOTests.test("MDLAnimatedVector4/accessors") {
        let animatedVal = MDLAnimatedVector4()
        let testCount = 10
        let testTimeVal = 5.0

        }
    }

    ModelIOTests.test("MDLMatrix4x4Array/accessors")
    .skip(.always("rdar://problem/50449570")).code {
        let testCount = 10
        let matrixArray = MDLMatrix4x4Array(elementCount: testCount)
        let testFloatVal = float4x4()
