tests: Add basic unit tests for fp-context

Link the tests with the private library using an utils library that will
be useful to share other tests functions

tests/meson.build

@@ -48,6 +48,32 @@ if get_option('introspection')
     endforeach
 endif
 
+if 'virtual_image' in drivers
+    test_utils = static_library('fprint-test-utils',
+        sources: ['test-utils.c'],
+        dependencies: libfprint_private_dep,
+        install: false)
+
+    unit_tests = [
+        'fp-context',
+    ]
+
+    foreach test_name: unit_tests
+        basename = 'test-' + test_name
+        test_exe = executable(basename,
+            sources: basename + '.c',
+            dependencies: libfprint_private_dep,
+            c_args: common_cflags,
+            link_with: test_utils)
+        test(test_name,
+            find_program('test-runner.sh'),
+            suite: ['unit-tests'],
+            args: [test_exe],
+            env: envs,
+        )
+    endforeach
+endif
+
 gdb = find_program('gdb', required: false)
 if gdb.found()
     add_test_setup('gdb',