Add unit tests for forced encryption check function

tests/unittests/test_forced_encryption.h

@@ -0,0 +1,16 @@
+#ifndef TEST_FORCED_ENCRYPTION_H
+#define TEST_FORCED_ENCRYPTION_H
+
+void test_cmd_force_encryption_no_args_bad_cmd(void** state);
+void test_cmd_force_encryption_toggles_on(void** state);
+void test_cmd_force_encryption_toggles_off(void** state);
+void test_cmd_force_encryption_toggles_off_already(void** state);
+void test_cmd_force_encryption_toggles_on_already(void** state);
+void test_cmd_force_encryption_sets_policy_block(void** state);
+void test_cmd_force_encryption_sets_policy_resend(void** state);
+void test_allow_unencrypted_message_blocks(void** state);
+void test_allow_unencrypted_message_confirms_on_second_attempt(void** state);
+void test_cmd_force_encryption_invalid_policy(void** state);
+void test_allow_unencrypted_message_invalid_mode(void** state);
+
+#endif // TEST_FORCED_ENCRYPTION_H