FEM: add contact solid solid unit test

src/Mod/Fem/CMakeLists.txt

@@ -167,6 +167,8 @@ SET(FemTestsCcx_SRCS
     femtest/data/ccx/__init__.py
     femtest/data/ccx/contact_shell_shell.FCStd
     femtest/data/ccx/contact_shell_shell.inp
+    femtest/data/ccx/constraint_contact_solid_solid.FCStd
+    femtest/data/ccx/constraint_contact_solid_solid.inp
     femtest/data/ccx/cube_frequency.inp
     femtest/data/ccx/cube_frequency.dat
     femtest/data/ccx/cube_frequency.frd

src/Mod/Fem/TestFem.py

@@ -126,6 +126,7 @@ gf()
 ./bin/FreeCADCmd --run-test "femtest.app.test_ccxtools.TestCcxTools.test_freq_analysis"
 ./bin/FreeCADCmd --run-test "femtest.app.test_ccxtools.TestCcxTools.test_static_analysis"
 ./bin/FreeCADCmd --run-test "femtest.app.test_ccxtools.TestCcxTools.test_static_contact_shell_shell"
+./bin/FreeCADCmd --run-test "femtest.app.test_ccxtools.TestCcxTools.test_static_constraint_contact_solid_solid"
 ./bin/FreeCADCmd --run-test "femtest.app.test_ccxtools.TestCcxTools.test_static_material_multiple"
 ./bin/FreeCADCmd --run-test "femtest.app.test_ccxtools.TestCcxTools.test_static_material_nonlinar"
 ./bin/FreeCADCmd --run-test "femtest.app.test_ccxtools.TestCcxTools.test_thermomech_flow1D_analysis"
@@ -173,6 +174,9 @@ unittest.TextTestRunner().run(unittest.TestLoader().loadTestsFromName("femtest.a
 import unittest
 unittest.TextTestRunner().run(unittest.TestLoader().loadTestsFromName("femtest.app.test_ccxtools.TestCcxTools.test_static_contact_shell_shell"))
 
+import unittest
+unittest.TextTestRunner().run(unittest.TestLoader().loadTestsFromName("femtest.app.test_ccxtools.TestCcxTools.test_constraint_static_contact_solid_solid"))
+
 import unittest
 unittest.TextTestRunner().run(unittest.TestLoader().loadTestsFromName("femtest.app.test_ccxtools.TestCcxTools.test_static_material_multiple"))
 

src/Mod/Fem/femtest/app/test_ccxtools.py

@@ -154,6 +154,27 @@ class TestCcxTools(unittest.TestCase):
             analysis_dir=analysis_dir,
         )
 
+    # ********************************************************************************************
+    def test_static_constraint_contact_solid_solid(
+        self
+    ):
+        # set up
+        from femexamples.constraint_contact_solid_solid import setup
+        setup(self.active_doc, "ccxtools")
+        test_name = "constraint contact solid solid"
+        base_name = "constraint_contact_solid_solid"
+        analysis_dir = testtools.get_unit_test_tmp_dir(
+            self.temp_dir,
+            "FEM_ccx_constraint_contact_solid_solid",
+        )
+
+        # test input file writing
+        self.input_file_writing_test(
+            test_name=test_name,
+            base_name=base_name,
+            analysis_dir=analysis_dir,
+        )
+
     # ********************************************************************************************
     def test_static_material_multiple(
         self