diff --git a/Makefile.am b/Makefile.am
index 88aa8d65..13ced7ba 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -123,6 +123,7 @@ vkd3d_shader_tests = \
 	tests/hlsl/f16tof32.shader_test \
 	tests/hlsl/f32tof16.shader_test \
 	tests/hlsl/faceforward.shader_test \
+	tests/hlsl/fog.shader_test \
 	tests/hlsl/ffp-point-size.shader_test \
 	tests/hlsl/float-comparison.shader_test \
 	tests/hlsl/floor.shader_test \
diff --git a/tests/hlsl/fog.shader_test b/tests/hlsl/fog.shader_test
new file mode 100644
index 00000000..7c4c161c
--- /dev/null
+++ b/tests/hlsl/fog.shader_test
@@ -0,0 +1,29 @@
+[require]
+shader model < 3.0
+
+[vertex shader fail todo]
+void main(float4 pos : position, out float2 fog : fog, out float4 out_pos : sv_position)
+{
+    fog = 0.5;
+    out_pos = pos;
+}
+
+[require]
+shader model >= 3.0
+
+[vertex shader]
+void main(float4 pos : position, out float2 fog : fog, out float4 out_pos : sv_position)
+{
+    fog = float2(0.1, 0.2);
+    out_pos = pos;
+}
+
+[pixel shader]
+float4 main(float2 fog : fog) : sv_target
+{
+    return float4(fog, 0, 1);
+}
+
+[test]
+draw quad
+probe (0, 0) rgba (0.1, 0.2, 0, 1)
diff --git a/tests/hlsl/shader-point-size.shader_test b/tests/hlsl/shader-point-size.shader_test
index 5936993a..a77259bb 100644
--- a/tests/hlsl/shader-point-size.shader_test
+++ b/tests/hlsl/shader-point-size.shader_test
@@ -9,6 +9,12 @@ shader model < 4.0
 -0.5 0      20
  0.5 0      40
 
+[vertex shader fail todo]
+void main(inout float4 pos : position, out float2 size : psize)
+{
+    size = 1;
+}
+
 [vertex shader]
 void main(inout float4 pos : position, inout float size : psize)
 {