tests: build_all: modem: test esp-at

Add build tests for the `espressif,esp-at` driver, together with both
the interrupt and async variants of modem_ifact_uart.

Only build the async API variant for emulated platforms, as many
platforms do not build cleanly when `UART_ASYNC_API` is enabled without
custom setup of DMA nodes.

Signed-off-by: Jordan Yates <jordan.yates@data61.csiro.au>

tests/drivers/build_all/modem/modem_esp_at.conf

@@ -0,0 +1,8 @@
+CONFIG_TEST=y
+CONFIG_TEST_RANDOM_GENERATOR=y
+CONFIG_SERIAL=y
+CONFIG_NETWORKING=y
+CONFIG_NET_SOCKETS=y
+CONFIG_NET_IPV4=y
+CONFIG_WIFI=y
+CONFIG_WIFI_ESP_AT=y

tests/drivers/build_all/modem/testcase.yaml

@@ -27,3 +27,14 @@ tests:
     extra_configs:
       - CONFIG_GSM_MUX=y
       - CONFIG_UART_MUX=y
+  drivers.modem.esp_at.build:
+    extra_args: CONF_FILE=modem_esp_at.conf
+    platform_exclude: ip_k66f
+    filter: CONFIG_SERIAL
+    min_ram: 36
+  drivers.modem.esp_at.async.build:
+    extra_args: CONF_FILE=modem_esp_at.conf
+    filter: CONFIG_SERIAL and CONFIG_QEMU_TARGET
+    min_ram: 36
+    extra_configs:
+      - CONFIG_MODEM_IFACE_UART_ASYNC=y

tests/drivers/build_all/modem/uart.dtsi

@@ -56,3 +56,8 @@ test_gsm_ppp: gsm_ppp {
 	compatible = "zephyr,gsm-ppp";
 	label = "gsm_ppp";
 };
+
+test_esp_at: esp_at {
+	compatible = "espressif,esp-at";
+	label = "espressif,esp-at";
+};