test: Add a way to check each line of console output

When writing tests to check the output from commands it is useful to be
able to check the output line by line using an assertion. Add helper
macros to support this and to check that there is no unexpected trailing
data.

Also some commands produce a dump using print_buffer(). Add a way to check
that the correct number of bytes are dumped (ignoring the actual
contents).

Signed-off-by: Simon Glass <sjg@chromium.org>

include/test/test.h

@@ -15,12 +15,16 @@
  * @start: Store the starting mallinfo when doing leak test
  * @priv: A pointer to some other info some suites want to track
  * @of_root: Record of the livetree root node (used for setting up tests)
+ * @expect_str: Temporary string used to hold expected string value
+ * @actual_str: Temporary string used to hold actual string value
  */
 struct unit_test_state {
 	int fail_count;
 	struct mallinfo start;
 	void *priv;
 	struct device_node *of_root;
+	char expect_str[256];
+	char actual_str[256];
 };
 
 /**

include/test/ut.h

@@ -38,6 +38,43 @@ void ut_failf(struct unit_test_state *uts, const char *fname, int line,
 	      const char *func, const char *cond, const char *fmt, ...)
 			__attribute__ ((format (__printf__, 6, 7)));
 
+/**
+ * ut_check_console_line() - Check the next console line against expectations
+ *
+ * This creates a string and then checks it against the next line of console
+ * output obtained with console_record_readline().
+ *
+ * After the function returns, uts->expect_str holds the expected string and
+ * uts->actual_str holds the actual string read from the console.
+ *
+ * @uts: Test state
+ * @fmt: printf() format string for the error, followed by args
+ * @return 0 if OK, other value on error
+ */
+int ut_check_console_line(struct unit_test_state *uts, const char *fmt, ...)
+			__attribute__ ((format (__printf__, 2, 3)));
+
+/**
+ * ut_check_console_end() - Check there is no more console output
+ *
+ * After the function returns, uts->actual_str holds the actual string read
+ * from the console
+ *
+ * @uts: Test state
+ * @return 0 if OK (console has no output), other value on error
+ */
+int ut_check_console_end(struct unit_test_state *uts);
+
+/**
+ * ut_check_console_dump() - Check that next lines have a print_buffer() dump
+ *
+ * This only supports a byte dump.
+ *
+ * @total_bytes: Size of the expected dump in bytes`
+ * @return 0 if OK (looks like a dump and the length matches), other value on
+ *	error
+ */
+int ut_check_console_dump(struct unit_test_state *uts, int total_bytes);
 
 /* Assert that a condition is non-zero */
 #define ut_assert(cond)							\
@@ -149,6 +186,34 @@ void ut_failf(struct unit_test_state *uts, const char *fname, int line,
 /* Assert that an operation succeeds (returns 0) */
 #define ut_assertok(cond)	ut_asserteq(0, cond)
 
+/* Assert that the next console output line matches */
+#define ut_assert_nextline(fmt, args...)				\
+	if (ut_check_console_line(uts, fmt, ##args)) {			\
+		ut_failf(uts, __FILE__, __LINE__, __func__,		\
+			 "console", "\nExpected '%s',\n     got '%s'",	\
+			 uts->expect_str, uts->actual_str);		\
+		return CMD_RET_FAILURE;					\
+	}								\
+
+/* Assert that there is no more console output */
+#define ut_assert_console_end()						\
+	if (ut_check_console_end(uts)) {				\
+		ut_failf(uts, __FILE__, __LINE__, __func__,		\
+			 "console", "Expected no more output, got '%s'",\
+			 uts->actual_str);				\
+		return CMD_RET_FAILURE;					\
+	}								\
+
+/* Assert that the next lines are print_buffer() dump at an address */
+#define ut_assert_nextlines_are_dump(total_bytes)			\
+	if (ut_check_console_dump(uts, total_bytes)) {			\
+		ut_failf(uts, __FILE__, __LINE__, __func__,		\
+			 "console",					\
+			"Expected dump of length %x bytes, got '%s'",	\
+			 total_bytes, uts->actual_str);			\
+		return CMD_RET_FAILURE;					\
+	}								\
+
 /**
  * ut_check_free() - Return the number of bytes free in the malloc() pool
  *

test/ut.c

@@ -6,6 +6,7 @@
  */
 
 #include <common.h>
+#include <console.h>
 #include <malloc.h>
 #include <test/test.h>
 #include <test/ut.h>
@@ -46,3 +47,48 @@ long ut_check_delta(ulong last)
 	return ut_check_free() - last;
 }
 
+int ut_check_console_line(struct unit_test_state *uts, const char *fmt, ...)
+{
+	va_list args;
+
+	va_start(args, fmt);
+	vsnprintf(uts->expect_str, sizeof(uts->expect_str), fmt, args);
+	va_end(args);
+	console_record_readline(uts->actual_str, sizeof(uts->actual_str));
+
+	return strcmp(uts->expect_str, uts->actual_str);
+}
+
+int ut_check_console_end(struct unit_test_state *uts)
+{
+	if (!console_record_avail())
+		return 0;
+
+	console_record_readline(uts->actual_str, sizeof(uts->actual_str));
+
+	return 1;
+}
+
+int ut_check_console_dump(struct unit_test_state *uts, int total_bytes)
+{
+	char *str = uts->actual_str;
+	int upto;
+
+	/* Handle empty dump */
+	if (!total_bytes)
+		return 0;
+
+	for (upto = 0; upto < total_bytes;) {
+		int len;
+		int bytes;
+
+		len = console_record_readline(str, sizeof(uts->actual_str));
+		if (str[8] != ':' || str[9] != ' ')
+			return 1;
+
+		bytes = len - 8 - 2 - 3 * 16 - 4;
+		upto += bytes;
+	}
+
+	return upto == total_bytes ? 0 : 1;
+}