diff --git a/tests/bugs/modalg_3/bug600 b/tests/bugs/modalg_3/bug600
index c0e93632fa..b9edf17d35 100755
--- a/tests/bugs/modalg_3/bug600
+++ b/tests/bugs/modalg_3/bug600
@@ -13,6 +13,30 @@ bop b a
 
 bopcommon result
 
+set square 41970.8
+
+set nbshapes_expected "
+Number of shapes in shape
+ VERTEX : 55
+ EDGE : 93
+ WIRE : 40
+ FACE : 40
+ SHELL : 1
+ SOLID : 1
+ COMPSOLID : 0
+ COMPOUND : 1
+ SHAPE : 231
+"
+checknbshapes result -ref ${nbshapes_expected} -t -m "Result of Boolean operations"
+
+checknbshapes r1 -ref ${nbshapes_expected} -t -m "BOPCOMMON"
+checkshape r1
+
+restore [locate_data_file OCC600_1.brep] a 
+restore [locate_data_file OCC600_2.brep] b 
+
+bcommon result b a
+
 checkprops result -s 41970.8
 checkshape result
 set 2dviewer 0
diff --git a/tests/bugs/modalg_6/bug26848 b/tests/bugs/modalg_6/bug26848
new file mode 100755
index 0000000000..4853b90855
--- /dev/null
+++ b/tests/bugs/modalg_6/bug26848
@@ -0,0 +1,33 @@
+puts "========================"
+puts " OCC26848"
+puts " OCC600"
+puts "========================"
+## Result of BOPCOMMON operation is unclosed shape inspite of source solids are valid
+## Result of BO depends on arguments order
+############################################################
+cpulimit 5000
+restore [locate_data_file OCC600_1.brep] a 
+checkshape a
+restore [locate_data_file OCC600_2.brep] b 
+checkshape b
+bop a b
+
+bopcommon result
+
+set square 41970.8
+
+set nbshapes_expected "
+Number of shapes in shape
+ VERTEX : 55
+ EDGE : 93
+ WIRE : 40
+ FACE : 40
+ SHELL : 1
+ SOLID : 1
+ COMPSOLID : 0
+ COMPOUND : 1
+ SHAPE : 231
+"
+checknbshapes result -ref ${nbshapes_expected} -t -m "Result of Boolean operations"
+
+set 2dviewer 0