dnn-layer-mathbinary-test: add unit test for minimum

Signed-off-by: Guo, Yejun <yejun.guo@intel.com>

tests/dnn/dnn-layer-mathbinary-test.c

@@ -38,6 +38,8 @@ static float get_expected(float f1, float f2, DNNMathBinaryOperation op)
         return f1 * f2;
     case DMBO_REALDIV:
         return f1 / f2;
+    case DMBO_MINIMUM:
+        return (f1 < f2) ? f1 : f2;
     default:
         av_assert0(!"not supported yet");
         return 0.f;
@@ -200,5 +202,8 @@ int main(int argc, char **argv)
     if (test(DMBO_REALDIV))
         return 1;
 
+    if (test(DMBO_MINIMUM))
+        return 1;
+
     return 0;
 }