diff --git a/src/pya/unit_tests/pyaTests.cc b/src/pya/unit_tests/pyaTests.cc
index b661c56dc..8adf4dd2f 100644
--- a/src/pya/unit_tests/pyaTests.cc
+++ b/src/pya/unit_tests/pyaTests.cc
@@ -102,6 +102,7 @@ PYTHONTEST (dbLayoutTest, "dbLayoutTest.py")
 PYTHONTEST (dbRegionTest, "dbRegionTest.py")
 PYTHONTEST (dbShapesTest, "dbShapesTest.py")
 PYTHONTEST (dbReaders, "dbReaders.py")
+PYTHONTEST (dbStreams, "dbStreams.py")
 PYTHONTEST (dbPCellsTest, "dbPCells.py")
 PYTHONTEST (dbPolygonTest, "dbPolygonTest.py")
 PYTHONTEST (dbTransTest, "dbTransTest.py")
diff --git a/testdata/pcb/simple/import.pcb b/testdata/pcb/simple/import.pcb
new file mode 100644
index 000000000..1f87a7788
--- /dev/null
+++ b/testdata/pcb/simple/import.pcb
@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="utf-8"?>
+<pcb-project>
+ <invert-negative-layers>false</invert-negative-layers>
+ <border>5000</border>
+ <free-layer-mapping>true</free-layer-mapping>
+ <layout-layers>
+  <layout-layer>1/0</layout-layer>
+  <layout-layer>2/0</layout-layer>
+ </layout-layers>
+ <mounting>top</mounting>
+ <num-metal-layers>0</num-metal-layers>
+ <num-via-types>0</num-via-types>
+ <artwork-files>
+ </artwork-files>
+ <drill-files>
+ </drill-files>
+ <free-files>
+  <free-file>
+   <filename>test1.gbr</filename>
+   <layout-layers>
+    <index>0</index>
+   </layout-layers>
+  </free-file>
+  <free-file>
+   <filename>test2.gbr</filename>
+   <layout-layers>
+    <index>1</index>
+   </layout-layers>
+  </free-file>
+ </free-files>
+ <reference-points>
+ </reference-points>
+ <explicit-trans>r0 *1 0,0</explicit-trans>
+ <layer-properties-file/>
+ <num-circle-points>-1</num-circle-points>
+ <merge-flag>false</merge-flag>
+ <dbu>0.001</dbu>
+ <cell-name>PCB</cell-name>
+</pcb-project>
diff --git a/testdata/pcb/simple/test1.gbr b/testdata/pcb/simple/test1.gbr
new file mode 100644
index 000000000..4147a2d98
--- /dev/null
+++ b/testdata/pcb/simple/test1.gbr
@@ -0,0 +1,17 @@
+%FSLAX46Y46*%
+%MOMM*%
+%LPD*%
+G01*
+%ADD10C,0.050000*%
+D10*
+%LPD*%
+G36*
+X0070000000Y0050000000D02*
+X0020000000Y0050000000D01*
+X0020000000Y0080000000D01*
+X0070000000Y0080000000D01*
+X0170000000Y0050000000D02*
+X0120000000Y0080000000D01*
+X0170000000Y0080000000D01*
+G37*
+M02*
diff --git a/testdata/pcb/simple/test2.gbr b/testdata/pcb/simple/test2.gbr
new file mode 100644
index 000000000..eb7f187e7
--- /dev/null
+++ b/testdata/pcb/simple/test2.gbr
@@ -0,0 +1,15 @@
+%FSLAX46Y46*%
+%MOMM*%
+%LPD*%
+G01*
+%ADD10C,0.050000*%
+D10*
+%LPD*%
+G36*
+X0070000000Y0050000000D02*
+X0070000000Y0050000000D01*
+X0020000000Y0050000000D01*
+X0020000000Y0080000000D01*
+X0070000000Y0080000000D01*
+G37*
+M02*
diff --git a/testdata/pymod/pya_tests.py b/testdata/pymod/pya_tests.py
index a3b5496e2..fb2642cf3 100644
--- a/testdata/pymod/pya_tests.py
+++ b/testdata/pymod/pya_tests.py
@@ -16,6 +16,7 @@ import dbPCells
 import dbLayoutTest
 import dbPolygonTest
 import dbReaders
+import dbStreams
 import dbRegionTest
 import dbTransTest
 import dbLayoutToNetlist
@@ -32,6 +33,7 @@ if __name__ == '__main__':
     unittest.TestLoader().loadTestsFromTestCase(dbLayoutTest.DBLayoutTest),
     unittest.TestLoader().loadTestsFromTestCase(dbPolygonTest.DBPolygonTests),
     unittest.TestLoader().loadTestsFromTestCase(dbReaders.DBReadersTests),
+    unittest.TestLoader().loadTestsFromTestCase(dbStreams.DBStreamsTests),
     unittest.TestLoader().loadTestsFromTestCase(dbRegionTest.DBRegionTest),
     unittest.TestLoader().loadTestsFromTestCase(dbTransTest.DBTransTests),
     # aborts on Azure/MSVC pipeline with "src\tl\tl\tlThreadedWorkers.cc,259,! m_running", needs debugging:
diff --git a/testdata/python/dbStreams.py b/testdata/python/dbStreams.py
new file mode 100644
index 000000000..918868c5d
--- /dev/null
+++ b/testdata/python/dbStreams.py
@@ -0,0 +1,96 @@
+# encoding: UTF-8
+
+# KLayout Layout Viewer
+# Copyright (C) 2006-2025 Matthias Koefferlein
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+import pya
+import unittest
+import sys
+import os
+
+class DBStreamsTests(unittest.TestCase):
+
+  # Full-spin read-write tests
+  # This test is rather a smoke test
+  def rw_test(self, format):
+
+    ly = pya.Layout()
+    cell = ly.create_cell("TOP")
+    l1 = ly.layer(1, 0)
+    cell.shapes(l1).insert(pya.Box(0, 0, 1000, 2000))
+    cell.shapes(l1).insert(pya.Box(-100, -200, 2000, 1000))
+    bbox = cell.bbox()
+
+    opt = pya.SaveLayoutOptions()
+    opt.format = format
+
+    b = ly.write_bytes(opt)
+    
+    ly2 = pya.Layout()
+    ly2.read_bytes(b)
+
+    tc = ly.top_cell()
+    self.assertEqual(tc.name, "TOP")
+    self.assertEqual(str(tc.bbox()), str(bbox))
+
+  def test_gds2(self):
+    self.rw_test("GDS2")
+  
+  def test_oasis(self):
+    self.rw_test("OASIS")
+  
+  def test_dxf(self):
+    self.rw_test("DXF")
+  
+  def test_cif(self):
+    self.rw_test("CIF")
+  
+  def test_lstream(self):
+    self.rw_test("LStream")
+  
+  def test_magic(self):
+    # Smoke test
+    ut_testsrc = os.getenv("TESTSRC")
+    ly = pya.Layout()
+    ly.read(os.path.join(ut_testsrc, "testdata", "magic", "ringo", "RINGO.mag"))
+  
+  def test_maly(self):
+    # Smoke test
+    ut_testsrc = os.getenv("TESTSRC")
+    ly = pya.Layout()
+    ly.read(os.path.join(ut_testsrc, "testdata", "maly", "MALY_test10.maly"))
+  
+  def test_pcb(self):
+    # Smoke test
+    ut_testsrc = os.getenv("TESTSRC")
+    ly = pya.Layout()
+    ly.read(os.path.join(ut_testsrc, "testdata", "pcb", "simple", "import.pcb"))
+  
+  def test_lefdef(self):
+    # Smoke test
+    ut_testsrc = os.getenv("TESTSRC")
+    ly = pya.Layout()
+    ly.read(os.path.join(ut_testsrc, "testdata", "lefdef", "scanchain", "test.def"))
+  
+# run unit tests
+if __name__ == '__main__':
+  suite = unittest.TestLoader().loadTestsFromTestCase(DBStreamsTests)
+
+  if not unittest.TextTestRunner(verbosity = 1).run(suite).wasSuccessful():
+    sys.exit(1)
+
+