[PATCH v4 2/2] tests: Add a basic compilation test for SampleGrad() method.

[Ethan Lee]

From: Ethan Lee

Signed-off-by: Ethan Lee 
---
 tests/sampler.shader_test | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/tests/sampler.shader_test b/tests/sampler.shader_test
index 2cb70a0b..7e6fb820 100644
--- a/tests/sampler.shader_test
+++ b/tests/sampler.shader_test
@@ -45,3 +45,16 @@ float4 main() : sv_target
 [test]
 draw quad
 probe all rgba (0.25, 0, 0.25, 0)
+
+[pixel shader]
+SamplerState s;
+Texture2D t;
+
+float4 main() : sv_target
+{
+    return t.SampleGrad(s, float2(0.5, 0.5), float2(0, 0), float2(0, 0));
+}
+
+[test]
+draw quad
+probe all rgba (0.25, 0, 0.25, 0)