Update README.md file with information how to run tests

Author: bartoszkosiorek

README.md

@@ -17,7 +17,7 @@ This installation guide focusses on Ubuntu 24.04 as a distribution. The process
 
 First, install a few pre-requisites:
 
-    sudo apt install pt-get install cmake g++ git python3-dev qt5-qmake libqt5opengl5-dev 
+    sudo apt install pt-get install cmake g++ git python3-dev qt5-qmake libqt5opengl5-dev libopenvdb-dev
 
 If you want to enable CUDA support, additionally get the latest toolkit from nVidia, and install the appropriate developer driver (be careful though, these driver tend to wreck X11 - get some installation instructions from the web if this is the first time you install CUDA on Linux)
 
@@ -29,9 +29,20 @@ To build the project using CMake, set up a build directory and choose the build
 
     mkdir mantaflow/build
     cd mantaflow/build
-    cmake .. -DGUI=ON -DOPENMP=ON
+    cmake .. -DGUI=ON -DTBB=ON -DOPENVDB=ON
     make -j4
 
 That's it! You can now test mantaflow using an example scene
 
     ./manta ../scenes/simpleplume.py
+
+## Run tests ##
+
+Generate reference date and run tests:
+
+    cd tools/tests
+    MANTA_GEN_TEST_DATA=1 ./runTests.py ../../build/manta
+
+Run tests:
+
+    ./runTests.py ../../build/manta