1 files changed, 143 insertions, 0 deletions
diff --git a/source/blender/blenlib/tests/BLI_index_range_test.cc b/source/blender/blenlib/tests/BLI_index_range_test.cc
new file mode 100644
index 00000000000..d472ded0f18
--- /dev/null
+++ b/source/blender/blenlib/tests/BLI_index_range_test.cc
@@ -0,0 +1,143 @@
+/* Apache License, Version 2.0 */
+
+#include "BLI_index_range.hh"
+#include "BLI_strict_flags.h"
+#include "BLI_vector.hh"
+#include "testing/testing.h"
+
+namespace blender::tests {
+
+TEST(index_range, DefaultConstructor)
+{
+  IndexRange range;
+  EXPECT_EQ(range.size(), 0);
+
+  Vector<int64_t> vector;
+  for (int64_t value : range) {
+    vector.append(value);
+  }
+  EXPECT_EQ(vector.size(), 0);
+}
+
+TEST(index_range, SingleElementRange)
+{
+  IndexRange range(4, 1);
+  EXPECT_EQ(range.size(), 1);
+  EXPECT_EQ(*range.begin(), 4);
+
+  Vector<int64_t> vector;
+  for (int64_t value : range) {
+    vector.append(value);
+  }
+
+  EXPECT_EQ(vector.size(), 1);
+  EXPECT_EQ(vector[0], 4);
+}
+
+TEST(index_range, MultipleElementRange)
+{
+  IndexRange range(6, 4);
+  EXPECT_EQ(range.size(), 4);
+
+  Vector<int64_t> vector;
+  for (int64_t value : range) {
+    vector.append(value);
+  }
+
+  EXPECT_EQ(vector.size(), 4);
+  for (int i = 0; i < 4; i++) {
+    EXPECT_EQ(vector[i], i + 6);
+  }
+}
+
+TEST(index_range, SubscriptOperator)
+{
+  IndexRange range(5, 5);
+  EXPECT_EQ(range[0], 5);
+  EXPECT_EQ(range[1], 6);
+  EXPECT_EQ(range[2], 7);
+}
+
+TEST(index_range, Before)
+{
+  IndexRange range = IndexRange(5, 5).before(3);
+  EXPECT_EQ(range[0], 2);
+  EXPECT_EQ(range[1], 3);
+  EXPECT_EQ(range[2], 4);
+  EXPECT_EQ(range.size(), 3);
+}
+
+TEST(index_range, After)
+{
+  IndexRange range = IndexRange(5, 5).after(4);
+  EXPECT_EQ(range[0], 10);
+  EXPECT_EQ(range[1], 11);
+  EXPECT_EQ(range[2], 12);
+  EXPECT_EQ(range[3], 13);
+  EXPECT_EQ(range.size(), 4);
+}
+
+TEST(index_range, Contains)
+{
+  IndexRange range = IndexRange(5, 3);
+  EXPECT_TRUE(range.contains(5));
+  EXPECT_TRUE(range.contains(6));
+  EXPECT_TRUE(range.contains(7));
+  EXPECT_FALSE(range.contains(4));
+  EXPECT_FALSE(range.contains(8));
+}
+
+TEST(index_range, First)
+{
+  IndexRange range = IndexRange(5, 3);
+  EXPECT_EQ(range.first(), 5);
+}
+
+TEST(index_range, Last)
+{
+  IndexRange range = IndexRange(5, 3);
+  EXPECT_EQ(range.last(), 7);
+}
+
+TEST(index_range, OneAfterEnd)
+{
+  IndexRange range = IndexRange(5, 3);
+  EXPECT_EQ(range.one_after_last(), 8);
+}
+
+TEST(index_range, Start)
+{
+  IndexRange range = IndexRange(6, 2);
+  EXPECT_EQ(range.start(), 6);
+}
+
+TEST(index_range, Slice)
+{
+  IndexRange range = IndexRange(5, 15);
+  IndexRange slice = range.slice(2, 6);
+  EXPECT_EQ(slice.size(), 6);
+  EXPECT_EQ(slice.first(), 7);
+  EXPECT_EQ(slice.last(), 12);
+}
+
+TEST(index_range, SliceRange)
+{
+  IndexRange range = IndexRange(5, 15);
+  IndexRange slice = range.slice(IndexRange(3, 5));
+  EXPECT_EQ(slice.size(), 5);
+  EXPECT_EQ(slice.first(), 8);
+  EXPECT_EQ(slice.last(), 12);
+}
+
+TEST(index_range, AsSpan)
+{
+  IndexRange range = IndexRange(4, 6);
+  Span<int64_t> span = range.as_span();
+  EXPECT_EQ(span.size(), 6);
+  EXPECT_EQ(span[0], 4);
+  EXPECT_EQ(span[1], 5);
+  EXPECT_EQ(span[2], 6);
+  EXPECT_EQ(span[3], 7);
+}
+
+}  // namespace blender::tests