initial commit

tests/test_wfc.cpp

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+#include <gtest/gtest.h>
+#include "nd-wfc/wfc.hpp"
+#include "nd-wfc/types.hpp"
+
+namespace nd_wfc {
+
+// Basic test for 2D WFC
+TEST(WfcTest, Basic2D) {
+    // Create a simple 2x2 grid with 2 tile types
+    Size<2> size = {2, 2};
+    std::vector<TileId> tiles = {0, 1};
+
+    // Simple constraints: tile 0 can connect to tile 0 and 1 in all directions
+    // tile 1 can only connect to tile 1
+    std::vector<Constraint> constraints = {
+        {0, 0, Direction::North}, {0, 0, Direction::South},
+        {0, 0, Direction::East}, {0, 0, Direction::West},
+        {0, 1, Direction::North}, {0, 1, Direction::South},
+        {0, 1, Direction::East}, {0, 1, Direction::West},
+        {1, 1, Direction::North}, {1, 1, Direction::South},
+        {1, 1, Direction::East}, {1, 1, Direction::West}
+    };
+
+    WfcConfig config;
+    config.seed = 42;  // For reproducible tests
+
+    Wfc2D wfc(size, tiles, constraints, config);
+
+    WfcResult result = wfc.run();
+
+    // The algorithm should succeed
+    EXPECT_EQ(result, WfcResult::Success);
+    EXPECT_TRUE(wfc.isComplete());
+}
+
+// Test grid functionality
+TEST(GridTest, Basic2D) {
+    Size<2> size = {3, 3};
+    Grid<2> grid(size);
+
+    // Test coordinate conversion
+    Coord<2> coord = {1, 2};
+    Index index = grid.coordToIndex(coord);
+    Coord<2> back_coord = grid.indexToCoord(index);
+
+    EXPECT_EQ(coord, back_coord);
+    EXPECT_EQ(grid.getSize(), size);
+    EXPECT_EQ(grid.getTotalSize(), 9);
+}
+
+} // namespace nd_wfc