From 20fd5a54a7160bc8ff474ca60dcd481767c728fd Mon Sep 17 00:00:00 2001
From: Matthias Koefferlein <matthias@klayout.de>
Date: Sat, 23 Mar 2024 16:57:44 +0100
Subject: [PATCH] Tests

---
 Changelog                              |  3 +++
 src/db/unit_tests/dbDeepRegionTests.cc | 29 ++++++++++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/Changelog b/Changelog
index 5a9b54af4..2ac7bcff6 100644
--- a/Changelog
+++ b/Changelog
@@ -1,3 +1,6 @@
+0.29.0           (2024-04-01):
+* TODO
+
 0.28.17          (2024-02-16):
 * Enhancement: %GITHUB%/issues/1626 Technology specific grids
 
diff --git a/src/db/unit_tests/dbDeepRegionTests.cc b/src/db/unit_tests/dbDeepRegionTests.cc
index 1037dc1c7..68c787fb8 100644
--- a/src/db/unit_tests/dbDeepRegionTests.cc
+++ b/src/db/unit_tests/dbDeepRegionTests.cc
@@ -2649,6 +2649,35 @@ TEST(101_DeepFlatCollaboration)
   db::compare_layouts (_this, target, tl::testdata () + "/algo/deep_region_au101.gds");
 }
 
+TEST(102_SameInputs)
+{
+  db::Layout ly;
+  {
+    std::string fn (tl::testdata ());
+    fn += "/algo/deep_region_l1.gds";
+    tl::InputStream stream (fn);
+    db::Reader reader (stream);
+    reader.read (ly);
+  }
+
+  db::cell_index_type top_cell_index = *ly.begin_top_down ();
+  db::Cell &top_cell = ly.cell (top_cell_index);
+
+  db::DeepShapeStore dss;
+
+  unsigned int l2 = ly.get_layer (db::LayerProperties (2, 0));
+  unsigned int l3 = ly.get_layer (db::LayerProperties (3, 0));
+
+  db::Region r2 (db::RecursiveShapeIterator (ly, top_cell, l2), dss);
+  db::Region r3 (db::RecursiveShapeIterator (ly, top_cell, l3), dss);
+
+  EXPECT_EQ ((r2 & r2).to_string (), "...");
+  EXPECT_EQ ((r2 - r2).to_string (), "...");
+  EXPECT_EQ ((r2 | r2).to_string (), "...");
+  EXPECT_EQ ((r2 ^ r2).to_string (), "...");
+  EXPECT_EQ ((r2 + r2).to_string (), "...");
+}
+
 TEST(issue_277)
 {
   db::Layout ly;