tests: Check if loading a pre-built binary keep working with libfprint

The libfprint tod fake library is built using using libtod v1.90.1+tod1
and we need to ensure that it will continue working until we won't
change ABI/API.

tests/meson.build

@@ -196,11 +196,10 @@ endif
 
 if get_option('tod')
     tod_envs = envs
-    tod_envs.set('FP_TOD_DRIVERS_DIR', meson.current_build_dir())
     tod_envs.set('FP_TOD_KEEP_MODULES_OPEN', 'TRUE')
     tod_envs.set('FP_VIRTUAL_FAKE_DEVICE', 'yes')
-    tod_envs.append('FP_DRIVERS_WHITELIST', 'fake_test_dev_tod')
     tod_envs.set('FP_TOD_TEST_DRIVER_NAME', 'fake_test_dev_tod')
+    tod_envs.prepend('LD_LIBRARY_PATH', meson.build_root() / 'libfprint/tod')
     tod_c_args = [
         '-DTEST_TOD_DRIVER=1',
     ]
@@ -233,6 +232,17 @@ if get_option('tod')
         'fpi-device',
     ]
 
+    tod_dirs = {
+        'fake_test_dev_tod_current': meson.current_build_dir(),
+    }
+
+    machine = run_command(meson.get_compiler('c'), '-dumpmachine').stdout().strip()
+    if machine.startswith('x86_64-')
+        tod_dirs += {
+            'fake_test_dev_tod_v1': meson.current_source_dir() / 'tod-drivers',
+        }
+    endif
+
     foreach test_name: tod_unit_tests
         basename = 'test-' + test_name
         sufix = test_name.endswith('-tod') ? '' : '-tod'
@@ -246,12 +256,20 @@ if get_option('tod')
             ],
             link_with: test_utils_tod,
         )
-        test(test_name,
+
-            find_program('test-runner.sh'),
+        foreach tod_driver, tod_dir : tod_dirs
-            suite: ['unit-tests', 'tod'],
+            tod_test_envs = tod_envs
-            args: [test_exe],
+            tod_test_envs.prepend('FP_DRIVERS_WHITELIST', tod_driver)
-            env: tod_envs,
+            tod_test_envs.set('FP_TOD_DRIVERS_DIR', tod_dir)
-            depends: fake_driver,
+            tod_test_envs.set('FP_TOD_TEST_DRIVER_NAME', tod_driver)
-        )
+
+            test(test_name + '-' + tod_driver,
+                find_program('test-runner.sh'),
+                suite: ['unit-tests', 'tod', tod_driver],
+                args: [test_exe],
+                env: tod_test_envs,
+                depends: fake_driver,
+            )
+        endforeach
     endforeach
 endif

tests/test-device-fake.c

@@ -19,7 +19,7 @@
  */
 
 #ifdef TEST_TOD_DRIVER
-#define FP_COMPONENT "fake_test_dev_tod"
+#define FP_COMPONENT "fake_test_dev_tod_current"
 #else
 #define FP_COMPONENT "fake_test_dev"
 #endif

tests/tod-drivers/README.md

@@ -0,0 +1,9 @@
+# TOD drivers to use for testing
+
+This directory is used by the test-suite to load and verify pre-built drivers.
+
+For main testing this directory should contain the "fake_test_dev" driver (AKA
+test-device-fake) built using the minimum libfprint TOD we want to support.
+
+In this way the library is loaded during tests and tested for all the upstream
+tests and particularly test-fpi-device.