tests: lib: add test for formatted output variants

Confirm that several ways of producing formatted output on the console
all work, and support evaluating the relative space requirements for
each.

Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>

tests/lib/cbprintf_fp/CMakeLists.txt

@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.13.1)
+
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(cbprintf_fp)
+
+target_sources(app PRIVATE src/main.c)

tests/lib/cbprintf_fp/Kconfig

@@ -0,0 +1,25 @@
+# Copyright (c) 2020 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+choice APP_FORMATTER
+	prompt "Select print formatter"
+	default APP_FORMATTER_PRINTK
+
+config APP_FORMATTER_PRINTK
+	bool "Emit with printk"
+
+config APP_FORMATTER_PRINTF
+	bool "Emit with printf"
+
+config APP_FORMATTER_PRINTFCB
+	bool "Emit with printfcb"
+
+config APP_FORMATTER_FPRINTF
+	bool "Emit with fprintf"
+
+config APP_FORMATTER_FPRINTFCB
+	bool "Emit with fprintfcb"
+
+endchoice # APP_FORMATTER
+
+source "Kconfig.zephyr"

tests/lib/cbprintf_fp/prj.conf

@@ -0,0 +1,3 @@
+# nothing here
+CONFIG_STDOUT_CONSOLE=y
+CONFIG_CBPRINTF_LIBC_SUBSTS=y

tests/lib/cbprintf_fp/src/main.c

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2020 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#if defined(CONFIG_APP_FORMATTER_PRINTK)
+#include <sys/printk.h>
+#define PRINT_S "printk"
+#define PRINT(...) printk(__VA_ARGS__)
+#elif defined(CONFIG_APP_FORMATTER_PRINTF)
+#include <stdio.h>
+#ifdef CONFIG_NEWLIB_LIBC
+#define PRINT_S "printf/newlib"
+#else /* NEWLIB_LIBC */
+#define PRINT_S "printf"
+#endif /* NEWLIB_LIBC */
+#define PRINT(...) printf(__VA_ARGS__)
+#elif defined(CONFIG_APP_FORMATTER_PRINTFCB)
+#include <sys/cbprintf.h>
+#ifdef CONFIG_NEWLIB_LIBC
+#define PRINT_S "printfcb/newlib"
+#else /* NEWLIB_LIBC */
+#define PRINT_S "printfcb"
+#endif /* NEWLIB_LIBC */
+#define PRINT(...) printfcb(__VA_ARGS__)
+#elif defined(CONFIG_APP_FORMATTER_FPRINTF)
+#include <stdio.h>
+#define PRINT_S "fprintf"
+#define PRINT(...) fprintf(stdout, __VA_ARGS__)
+#elif defined(CONFIG_APP_FORMATTER_FPRINTFCB)
+#include <sys/cbprintf.h>
+#define PRINT_S "fprintfcb"
+#define PRINT(...) fprintfcb(stdout, __VA_ARGS__)
+#else
+#error Unsupported configuration
+#endif
+
+void main(void)
+{
+	PRINT("Hello with %s on %s\nComplete\n", PRINT_S, CONFIG_BOARD);
+}

tests/lib/cbprintf_fp/testcase.yaml

@@ -0,0 +1,72 @@
+common:
+  harness: console
+  platform_exclude: native_posix native_posix_64 nrf52_bsim
+  integration_platforms:
+    - qemu_x86
+    - qemu_x86_64
+tests:
+  lib.cbprintf_fp.printk:
+    extra_configs:
+      - CONFIG_APP_FORMATTER_PRINTK=y
+    harness_config:
+      type: multi_line
+      ordered: true
+      regex:
+        - "Hello with printk"
+        - "Complete"
+  lib.cbprintf_fp.printf:
+    extra_configs:
+      - CONFIG_APP_FORMATTER_PRINTF=y
+    harness_config:
+      type: multi_line
+      ordered: true
+      regex:
+        - "Hello with printf"
+        - "Complete"
+  lib.cbprintf_fp.printf_nl:
+    extra_configs:
+      - CONFIG_APP_FORMATTER_PRINTF=y
+      - CONFIG_NEWLIB_LIBC=y
+    harness_config:
+      type: multi_line
+      ordered: true
+      regex:
+        - "Hello with printf/newlib"
+        - "Complete"
+  lib.cbprintf_fp.printfcb:
+    extra_configs:
+      - CONFIG_APP_FORMATTER_PRINTFCB=y
+    harness_config:
+      type: multi_line
+      ordered: true
+      regex:
+        - "Hello with printfcb"
+        - "Complete"
+  lib.cbprintf_fp.printfcb_nl:
+    extra_configs:
+      - CONFIG_APP_FORMATTER_PRINTFCB=y
+      - CONFIG_NEWLIB_LIBC=y
+    harness_config:
+      type: multi_line
+      ordered: true
+      regex:
+        - "Hello with printfcb/newlib"
+        - "Complete"
+  lib.cbprintf_fp.fprintf:
+    extra_configs:
+      - CONFIG_APP_FORMATTER_FPRINTF=y
+    harness_config:
+      type: multi_line
+      ordered: true
+      regex:
+        - "Hello with fprintf"
+        - "Complete"
+  lib.cbprintf_fp.fprintfcb:
+    extra_configs:
+      - CONFIG_APP_FORMATTER_FPRINTFCB=y
+    harness_config:
+      type: multi_line
+      ordered: true
+      regex:
+        - "Hello with fprintfcb"
+        - "Complete"