Improve template path handling. Add synthesis tests

test/README.md

@@ -11,6 +11,20 @@ https://fpgasoftware.intel.com/ and is sufficient to run unit tests. You will ne
 to generate a free license file to unlock the software: https://licensing.intel.com/psg/s/sales-signup-evaluationlicenses
 
 
+
+## Vivado (optional)
+
+To run synthesis tests, Vivado needs to be installed and visible via the PATH environment variable.
+
+Vivado can be downloaded for free from: https://www.xilinx.com/support/download.html
+
+To skip synthesis tests, export the following environment variable:
+```bash
+export SKIP_SYNTH_TESTS=1
+```
+
+
+
 ## Python Packages
 Install dependencies required for running tests
 
@@ -18,6 +32,8 @@ Install dependencies required for running tests
 python3 -m pip install test/requirements.txt
 ```
 
+
+
 # Running tests
 
 Tests can be launched from the test directory using `pytest`.
@@ -36,6 +52,7 @@ pytest
 ```
 
 
+
 # Test organization
 
 The goal for this test infrastructure is to make it easy to add small-standalone