Tests: Bluetooth: Build Host with different configurations

The new `host_config_variants` goal is to be able to test specific set
of configurations when building the Host without the need of having a
specific application for it.

The first test check that the Host build correctly with
`CONFIG_BT_SMP_OOB_LEGACY_PAIR_ONLY` enabled.

Signed-off-by: Théo Battrel <theo.battrel@nordicsemi.no>

tests/bluetooth/host_config_variants/CMakeLists.txt

@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.20.0)
+
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(host_config_variants)
+
+target_sources(app PRIVATE src/empty.c)

tests/bluetooth/host_config_variants/prj.conf

@@ -0,0 +1 @@
+CONFIG_BT=y

tests/bluetooth/host_config_variants/src/empty.c

@@ -0,0 +1,10 @@
+/*
+ * Copyright (c) 2024 Nordic Semiconductor
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+int main(void)
+{
+	return 0;
+}

tests/bluetooth/host_config_variants/testcase.yaml

@@ -0,0 +1,16 @@
+tests:
+  # Test that the Host builds with BT_SMP_OOB_LEGACY_PAIR_ONLY enabled
+  bluetooth.host_config_variants.config_bt_smp_oob_legacy_pair_only:
+    extra_configs:
+      - CONFIG_BT_SMP=y
+      - CONFIG_BT_PERIPHERAL=y
+      - CONFIG_BT_SMP_SC_PAIR_ONLY=n
+      - CONFIG_BT_SMP_OOB_LEGACY_PAIR_ONLY=y
+    platform_allow:
+      - native_sim
+      - native_sim/native/64
+    integration_platforms:
+      - native_sim
+    tags:
+      - bluetooth
+    build_only: true