test: Handle functional test disk-full error

test/functional/test_runner.py

@@ -30,6 +30,9 @@
 
 os.environ["REQUIRE_WALLET_TYPE_SET"] = "1"
 
+# Should fail testing and immediately stop if free space falls below.
+MIN_FREE_SPACE = (50 + 16) * 1024 * 1024
+
 # Formatting. Default colors to empty strings.
 DEFAULT, BOLD, GREEN, RED = ("", ""), ("", ""), ("", ""), ("", "")
 try:
@@ -574,6 +577,11 @@ def run_tests(*, test_list, src_dir, build_dir, tmpdir, jobs=1, enable_coverage=
     if not result.wasSuccessful():
         sys.exit("Early exiting after failure in TestFramework unit tests")
 
+    # Exit the test if there is not enough space on the testing dir
+    testdir_disk_usage_stats = shutil.disk_usage(tmpdir)
+    if (testdir_disk_usage_stats.free < MIN_FREE_SPACE):
+        sys.exit(f"Tests aborted: Insufficient space available on the device. Directory: {tmpdir}")
+
     flags = ['--cachedir={}'.format(cache_dir)] + args
 
     if enable_coverage:
@@ -655,7 +663,7 @@ def run_tests(*, test_list, src_dir, build_dir, tmpdir, jobs=1, enable_coverage=
 
     all_passed = all_passed and coverage_passed
 
-    # Clean up dangling processes if any. This may only happen with --failfast option.
+    # Clean up dangling processes if any. This may only happen with --failfast option or not enough space on test directory.
     # Killing the process group will also terminate the current process but that is
     # not an issue
     if not os.getenv("CI_FAILFAST_TEST_LEAVE_DANGLING") and len(job_queue.jobs):