Add test for Distribution

src/gpu/GridGenerator/CMakeLists.txt

 project(GridGenerator LANGUAGES CXX)
 
 vf_add_library(PRIVATE_LINK basics OpenMP::OpenMP_CXX)
+vf_add_tests()
 
 if(NOT MSVC) 
    target_compile_options(GridGenerator PRIVATE "-Wno-strict-aliasing")

src/gpu/GridGenerator/grid/distributions/DistributionTest.cpp

+# include <gmock/gmock.h>
+#include <string>
+# include "Distribution.h"
+
+#include "grid/distributions/D3Q27.h"
+
+TEST(DistributionTest, DistributionReturnsCorrectDirections)
+{
+    Distribution dist = DistributionHelper::getDistribution27();
+
+    EXPECT_THAT(dist.directions[DIR_27_E][0], testing::Eq(DIR_27_E_X));
+    EXPECT_THAT(dist.directions[DIR_27_E][1], testing::Eq(DIR_27_E_Y));
+    EXPECT_THAT(dist.directions[DIR_27_E][2], testing::Eq(DIR_27_E_Z));
+    EXPECT_THAT(dist.dirs[DIR_27_E * 3    ], testing::Eq(DIR_27_E_X));
+    EXPECT_THAT(dist.dirs[DIR_27_E * 3 + 1], testing::Eq(DIR_27_E_Y));
+    EXPECT_THAT(dist.dirs[DIR_27_E * 3 + 2], testing::Eq(DIR_27_E_Z));
+
+    EXPECT_THAT(dist.directions[DIR_27_B][0], testing::Eq(DIR_27_B_X));
+    EXPECT_THAT(dist.directions[DIR_27_B][1], testing::Eq(DIR_27_B_Y));
+    EXPECT_THAT(dist.directions[DIR_27_B][2], testing::Eq(DIR_27_B_Z));
+    EXPECT_THAT(dist.dirs[DIR_27_B * 3    ], testing::Eq(DIR_27_B_X));
+    EXPECT_THAT(dist.dirs[DIR_27_B * 3 + 1], testing::Eq(DIR_27_B_Y));
+    EXPECT_THAT(dist.dirs[DIR_27_B * 3 + 2], testing::Eq(DIR_27_B_Z));
+    
+    EXPECT_THAT(dist.directions[DIR_27_ZERO][0], testing::Eq(0));
+    EXPECT_THAT(dist.directions[DIR_27_ZERO][1], testing::Eq(0));
+    EXPECT_THAT(dist.directions[DIR_27_ZERO][2], testing::Eq(0));
+    EXPECT_THAT(dist.dirs[DIR_27_ZERO * 3    ], testing::Eq(0));
+    EXPECT_THAT(dist.dirs[DIR_27_ZERO * 3 + 1], testing::Eq(0));
+    EXPECT_THAT(dist.dirs[DIR_27_ZERO * 3 + 2], testing::Eq(0));
+
+    EXPECT_THAT(dist.directions[DIR_27_NE][0], testing::Eq(DIR_27_NE_X));
+    EXPECT_THAT(dist.directions[DIR_27_NE][1], testing::Eq(DIR_27_NE_Y));
+    EXPECT_THAT(dist.directions[DIR_27_NE][2], testing::Eq(DIR_27_NE_Z));
+    EXPECT_THAT(dist.dirs[DIR_27_NE * 3    ], testing::Eq(DIR_27_NE_X));
+    EXPECT_THAT(dist.dirs[DIR_27_NE * 3 + 1], testing::Eq(DIR_27_NE_Y));
+    EXPECT_THAT(dist.dirs[DIR_27_NE * 3 + 2], testing::Eq(DIR_27_NE_Z));
+
+    EXPECT_THAT(dist.directions[DIR_27_TS][0], testing::Eq(DIR_27_TS_X));
+    EXPECT_THAT(dist.directions[DIR_27_TS][1], testing::Eq(DIR_27_TS_Y));
+    EXPECT_THAT(dist.directions[DIR_27_TS][2], testing::Eq(DIR_27_TS_Z));
+    EXPECT_THAT(dist.dirs[DIR_27_TS * 3    ], testing::Eq(DIR_27_TS_X));
+    EXPECT_THAT(dist.dirs[DIR_27_TS * 3 + 1], testing::Eq(DIR_27_TS_Y));
+    EXPECT_THAT(dist.dirs[DIR_27_TS * 3 + 2], testing::Eq(DIR_27_TS_Z));
+
+    EXPECT_THAT(dist.directions[DIR_27_TNE][0], testing::Eq(DIR_27_TNE_X));
+    EXPECT_THAT(dist.directions[DIR_27_TNE][1], testing::Eq(DIR_27_TNE_Y));
+    EXPECT_THAT(dist.directions[DIR_27_TNE][2], testing::Eq(DIR_27_TNE_Z));
+    EXPECT_THAT(dist.dirs[DIR_27_TNE * 3    ], testing::Eq(DIR_27_TNE_X));
+    EXPECT_THAT(dist.dirs[DIR_27_TNE * 3 + 1], testing::Eq(DIR_27_TNE_Y));
+    EXPECT_THAT(dist.dirs[DIR_27_TNE * 3 + 2], testing::Eq(DIR_27_TNE_Z));
+
+    EXPECT_THAT(dist.directions[DIR_27_BSW][0], testing::Eq(DIR_27_BSW_X));
+    EXPECT_THAT(dist.directions[DIR_27_BSW][1], testing::Eq(DIR_27_BSW_Y));
+    EXPECT_THAT(dist.directions[DIR_27_BSW][2], testing::Eq(DIR_27_BSW_Z));
+    EXPECT_THAT(dist.dirs[DIR_27_BSW * 3    ], testing::Eq(DIR_27_BSW_X));
+    EXPECT_THAT(dist.dirs[DIR_27_BSW * 3 + 1], testing::Eq(DIR_27_BSW_Y));
+    EXPECT_THAT(dist.dirs[DIR_27_BSW * 3 + 2], testing::Eq(DIR_27_BSW_Z));
+}
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