1 files changed, 101 insertions, 0 deletions
diff --git a/zephyr/test/uart_printf/src/main.cc b/zephyr/test/uart_printf/src/main.cc
new file mode 100644
index 0000000000..9feb6a7ae9
--- /dev/null
+++ b/zephyr/test/uart_printf/src/main.cc
@@ -0,0 +1,101 @@
+/* Copyright 2022 The ChromiumOS Authors
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include <cstring>
+#include <string>
+
+#include <zephyr/ztest.h>
+
+#include "common.h"
+#include "printf.h"
+#include "uart.h"
+
+ZTEST_SUITE(uart_printf, nullptr, nullptr, nullptr, nullptr, nullptr);
+
+ZTEST(uart_printf, test_uart_putc)
+{
+	int return_vals[] = { 0, -1 };
+
+	SET_RETURN_SEQ(uart_tx_char_raw, return_vals, 2);
+
+	zassert_ok(uart_putc(5));
+	zassert_equal(EC_ERROR_OVERFLOW, uart_putc(5));
+}
+
+ZTEST(uart_printf, test_uart_put_success)
+{
+	const std::string test_string = "test string";
+	std::string output_string;
+
+	/* Print the whole string */
+	zassert_equal(test_string.size(),
+		      static_cast<size_t>(uart_put(test_string.c_str(),
+						   test_string.size())));
+	zassert_equal(test_string.size(), uart_tx_char_raw_fake.call_count);
+
+	/* Copy the history so it's easier to assert */
+	for (size_t i = 0; i < test_string.size(); ++i) {
+		output_string += uart_tx_char_raw_fake.arg1_history[i];
+	}
+
+	/* Verify that the string was passed to uart_tx_char_raw() */
+	zassert_equal(test_string, output_string);
+}
+
+ZTEST(uart_printf, test_uart_put_fail_tx)
+{
+	const char test_string[] = "\n";
+
+	uart_tx_char_raw_fake.return_val = -1;
+
+	/* Try printing the newline */
+	zassert_equal(0, uart_put(test_string, 1));
+	zassert_equal(1, uart_tx_char_raw_fake.call_count);
+	zassert_equal('\r', uart_tx_char_raw_fake.arg1_val);
+}
+
+ZTEST(uart_printf, test_uart_puts_fail_tx)
+{
+	const char test_string[] = "\n\0";
+
+	uart_tx_char_raw_fake.return_val = -1;
+
+	/* Try printing the newline */
+	zassert_equal(EC_ERROR_OVERFLOW, uart_puts(test_string));
+	zassert_equal(1, uart_tx_char_raw_fake.call_count);
+	zassert_equal('\r', uart_tx_char_raw_fake.arg1_val);
+}
+
+ZTEST(uart_printf, test_uart_put_raw_fail_tx)
+{
+	const char test_string[] = "\n";
+
+	uart_tx_char_raw_fake.return_val = -1;
+
+	/* Try printing the newline */
+	zassert_equal(0, uart_put_raw(test_string, 1));
+	zassert_equal(1, uart_tx_char_raw_fake.call_count);
+	zassert_equal('\n', uart_tx_char_raw_fake.arg1_val);
+}
+
+static int vfnprintf_custom_fake_expect_int_arg;
+static int vfnprintf_custom_fake(vfnprintf_addchar_t, void *, const char *,
+				 va_list alist)
+{
+	zassert_equal(vfnprintf_custom_fake_expect_int_arg, va_arg(alist, int));
+	return 0;
+}
+ZTEST(uart_printf, test_uart_printf)
+{
+	const char test_format[] = "d=%d";
+
+	vfnprintf_custom_fake_expect_int_arg = 5;
+	vfnprintf_fake.custom_fake = vfnprintf_custom_fake;
+
+	zassert_ok(
+		uart_printf(test_format, vfnprintf_custom_fake_expect_int_arg));
+	zassert_equal(1, vfnprintf_fake.call_count);
+	zassert_equal(test_format, vfnprintf_fake.arg2_val);
+}