diff --git a/TESTSUITE/enginetests/cavity.m b/TESTSUITE/enginetests/cavity.m
new file mode 100644
index 0000000..864079c
--- /dev/null
+++ b/TESTSUITE/enginetests/cavity.m
@@ -0,0 +1,137 @@
+function pass = cavity
+%pass = cavity
+% 
+% Checks, if different engines produces identical results
+
+CLEANUP = 1;        % if enabled and result is PASS, remove simulation folder
+STOP_IF_FAILED = 1; % if enabled and result is FAILED, stop with error
+
+engines = {'' '--engine=sse' '--engine=sse-compressed' '--engine=multithreaded'};
+
+isOctave = exist('OCTAVE_VERSION','builtin') ~= 0;
+if isOctave
+    old_crr = confirm_recursive_rmdir(0);
+end
+
+global Sim_Path Sim_CSX
+Sim_Path = 'tmp';
+Sim_CSX = 'cavity.xml';
+
+for n=1:numel(engines)
+    result{n} = sim( engines{n} );
+end
+
+pass = compare( result );
+
+if pass
+    disp( 'enginetests/cavity.m (engine comparison):  pass' );
+else
+    disp( 'enginetests/cavity.m (engine comparison):  * FAILED *' );
+end
+
+if pass && CLEANUP
+    rmdir( Sim_Path, 's' );
+end
+if ~pass && STOP_IF_FAILED
+    error 'test failed'
+end
+
+if isOctave
+    confirm_recursive_rmdir(old_crr);
+end
+return
+
+
+function result = sim( openEMS_options )
+global Sim_Path Sim_CSX
+physical_constants;
+
+% structure
+a = 5e-2;
+b = 2e-2;
+d = 6e-2;
+if ~((b<a) && (a<d))
+    error 'correct the dimensions of the cavity'
+end
+
+f_start = 1e9;
+f_stop = 10e9;
+
+% prepare simulation dir
+[status,message,messageid] = rmdir(Sim_Path,'s');
+[status,message,messageid] = mkdir(Sim_Path);
+
+% setup FDTD parameter
+FDTD = InitFDTD( 2000,1e-6 );
+FDTD = SetGaussExcite(FDTD,(f_stop-f_start)/2,(f_stop-f_start)/2);
+BC = {'PEC' 'PEC' 'PEC' 'PEC' 'PEC' 'PEC'}; % PEC boundaries
+FDTD = SetBoundaryCond(FDTD,BC);
+
+% setup CSXCAD geometry
+CSX = InitCSX();
+mesh.x = linspace(0,a,26);
+mesh.y = linspace(0,b,11);
+mesh.z = linspace(0,d,32);
+CSX = DefineRectGrid(CSX, 1,mesh);
+
+% excitation
+CSX = AddExcitation(CSX,'excite1',0,[1 1 1]);
+p(1,1) = mesh.x(floor(end*2/3));
+p(2,1) = mesh.y(floor(end*2/3));
+p(3,1) = mesh.z(floor(end*2/3));
+p(1,2) = mesh.x(floor(end*2/3)+1);
+p(2,2) = mesh.y(floor(end*2/3)+1);
+p(3,2) = mesh.z(floor(end*2/3)+1);
+CSX = AddCurve( CSX, 'excite1', 0, p );
+ 
+% dump
+CSX = AddDump( CSX, 'Et', 'DumpType', 0, 'DumpMode', 0, 'FileType', 1 ); % hdf5 E-field dump without interpolation
+pos1 = [mesh.x(1) mesh.y(1) mesh.z(1)];
+pos2 = [mesh.x(end) mesh.y(end) mesh.z(end)];
+CSX = AddBox( CSX, 'Et', 0, pos1, pos2 );
+
+% dump
+CSX = AddDump( CSX, 'Ht', 'DumpType', 1, 'DumpMode', 0, 'FileType', 1 ); % hdf5 H-field dump without interpolation
+pos1 = [mesh.x(1) mesh.y(1) mesh.z(1)];       % should be half a cell more than now
+pos2 = [mesh.x(end) mesh.y(end) mesh.z(end)]; % should be half a cell less than now
+CSX = AddBox( CSX, 'Ht', 0, pos1, pos2 );
+
+% Write openEMS compatible xml-file
+WriteOpenEMS( [Sim_Path '/' Sim_CSX], FDTD, CSX );
+
+% cd to working dir and run openEMS
+RunOpenEMS( Sim_Path, Sim_CSX, openEMS_options );
+
+% collect result
+E.mesh = ReadHDF5Mesh( [Sim_Path '/Et.h5'] );
+E.data = ReadHDF5FieldData( [Sim_Path '/Et.h5'] );
+H.mesh = ReadHDF5Mesh( [Sim_Path '/Ht.h5'] );
+H.data = ReadHDF5FieldData( [Sim_Path '/Ht.h5'] );
+result.E = E;
+result.H = H;
+
+
+
+
+function pass = compare( results )
+pass = 0;
+% n=1: reference simulation
+for n=2:numel(results)
+    % iterate over all simulations
+    EHfields = fieldnames(results{1});
+    for m=1:numel(EHfields)
+        % iterate over all fields (E, H)
+        EHfield = EHfields{m};
+        for o=1:numel(results{1}.(EHfield).data.values)
+            % iterate over all timesteps
+            if results{1}.(EHfield).data.values{o} ~= results{n}.(EHfield).data.values{o}
+                disp( ['compare error: n=' num2str(n) '  field=' EHfield '  timestep:' num2str(o) '=' results{1}.(EHfield).data.names{o}] );
+                disp( '  coords:' );
+                find( results{1}.(EHfield).data.values{o} ~= results{n}.(EHfield).data.values{o} )
+                return
+            end
+        end
+    end
+    disp( ['simulation ' num2str(n) ' is identical to simulation 1'] );
+end
+pass = 1;