test: add logging API test

Test that setting the log file and log levels works from an application
point of view. The test uses the internal logging mechanism as well,
just to write to the log file.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

test/log.cpp

@@ -0,0 +1,92 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * log.cpp - log API test
+ */
+
+#include <algorithm>
+#include <fcntl.h>
+#include <iostream>
+#include <list>
+#include <sstream>
+#include <stdio.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <libcamera/logging.h>
+
+#include "log.h"
+#include "test.h"
+
+using namespace std;
+using namespace libcamera;
+
+LOG_DEFINE_CATEGORY(LogAPITest)
+
+class LogAPITest : public Test
+{
+protected:
+	int run() override
+	{
+		int fd = open("/tmp", O_TMPFILE | O_RDWR, S_IRUSR | S_IWUSR);
+		if (fd < 0) {
+			cerr << "Failed to open tmp log file" << endl;
+			return TestFail;
+		}
+
+		char path[32];
+		snprintf(path, sizeof(path), "/proc/self/fd/%u", fd);
+
+		logSetFile(path);
+
+		logSetLevel("LogAPITest", "DEBUG");
+		LOG(LogAPITest, Info) << "good 1";
+
+		logSetLevel("LogAPITest", "WARN");
+		LOG(LogAPITest, Info) << "bad";
+
+		logSetLevel("LogAPITest", "ERROR");
+		LOG(LogAPITest, Error) << "good 3";
+		LOG(LogAPITest, Info) << "bad";
+
+		logSetLevel("LogAPITest", "WARN");
+		LOG(LogAPITest, Warning) << "good 5";
+		LOG(LogAPITest, Info) << "bad";
+
+		char buf[1000];
+		memset(buf, 0, sizeof(buf));
+		lseek(fd, 0, SEEK_SET);
+		read(fd, buf, sizeof(buf));
+		close(fd);
+
+		std::list<int> goodList = { 1, 3, 5 };
+		std::basic_istringstream<char> iss((std::string(buf)));
+		std::string line;
+		while (getline(iss, line)) {
+			if (goodList.empty()) {
+				cout << "Too many log lines" << endl;
+				return TestFail;
+			}
+
+			unsigned int digit = line.back() - '0';
+			unsigned int expect = goodList.front();
+			goodList.pop_front();
+			if (digit != expect) {
+				cout << "Incorrect log line" << endl;
+				return TestFail;
+			}
+		}
+
+		if (!goodList.empty()) {
+			cout << "Too few log lines" << endl;
+			return TestFail;
+		}
+
+		return TestPass;
+	}
+};
+
+TEST_REGISTER(LogAPITest)

test/meson.build

@@ -21,6 +21,7 @@ public_tests = [
 
 internal_tests = [
     ['camera-sensor',                   'camera-sensor.cpp'],
+    ['log',                             'log.cpp'],
     ['message',                         'message.cpp'],
     ['signal-threads',                  'signal-threads.cpp'],
     ['threads',                         'threads.cpp'],