1 files changed, 45 insertions, 0 deletions
diff --git a/source/test/blocks_along_line_test.cpp b/source/test/blocks_along_line_test.cpp
new file mode 100644
index 0000000..5026c00
--- /dev/null
+++ b/source/test/blocks_along_line_test.cpp
@@ -0,0 +1,45 @@
+#include "StarBlocksAlongLine.hpp"
+#include "StarList.hpp"
+
+#include "gtest/gtest.h"
+
+using namespace Star;
+
+void testLine(Vec2D a, Vec2D b, Vec2I offset, List<Vec2I> comp) {
+  List<Vec2I> res;
+  forBlocksAlongLine(a + Vec2D(offset),
+      b - a,
+      [&res](int x, int y) {
+        res.append({x, y});
+        return true;
+      });
+  for (auto& c : comp)
+    c += offset;
+  EXPECT_TRUE(comp == res);
+}
+
+void testGroup(Vec2I offset) {
+  testLine(Vec2D(0.5, 0.5), Vec2D(0.5, 0.5), offset, {{0, 0}});
+  testLine(Vec2D(-0.5, -0.5), Vec2D(-0.5, -0.5), offset, {{-1, -1}});
+
+  testLine(Vec2D(-0.5, -0.5), Vec2D(0.5, 0.5), offset, {{-1, -1}, {0, 0}});
+  testLine(Vec2D(0.5, 0.5), Vec2D(-0.5, -0.5), offset, {{0, 0}, {-1, -1}});
+  testLine(Vec2D(-0.5, 0.5), Vec2D(0.5, -0.5), offset, {{-1, 0}, {0, -1}});
+  testLine(Vec2D(0.5, -0.5), Vec2D(-0.5, 0.5), offset, {{0, -1}, {-1, 0}});
+
+  testLine(Vec2D(0.5, -0.5), Vec2D(0.5, 0.5), offset, {{0, -1}, {0, 0}});
+  testLine(Vec2D(-0.5, 0.5), Vec2D(0.5, 0.5), offset, {{-1, 0}, {0, 0}});
+
+  testLine(Vec2D(0.0, 0.5), Vec2D(0.0, -0.5), offset, {{0, 0}, {0, -1}});
+  testLine(Vec2D(0.5, 0.0), Vec2D(-0.5, 0.0), offset, {{0, 0}, {-1, 0}});
+}
+
+TEST(BlocksAlongLine, All) {
+  testGroup({0, 0});
+  testGroup({50, 50});
+  testGroup({-5, -50});
+  testGroup({50, -5});
+  testGroup({100, 10});
+  testGroup({-10, -100});
+  testGroup({-10, 10});
+}