Annote E V E R Y T H I N G with license info

test/fixtures/CMakeLists.txt

@@ -1 +1,7 @@
+/*
+ * Copyright 2023 jacqueline <me@jacqueline.id.au>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
 idf_component_register(INCLUDE_DIRS "." REQUIRES drivers)

test/fixtures/i2c_fixture.hpp

@@ -1,3 +1,9 @@
+/*
+ * Copyright 2023 jacqueline <me@jacqueline.id.au>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
 #pragma once
 
 #include "catch2/catch.hpp"

test/fixtures/spi_fixture.hpp

@@ -1,3 +1,9 @@
+/*
+ * Copyright 2023 jacqueline <me@jacqueline.id.au>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
 #pragma once
 
 #include "catch2/catch.hpp"