libprocps version test and documentation

test binary and man page for the version part of libprocps.
It's a simple start, but it's a start!

proc/test_version.c

@@ -0,0 +1,54 @@
+/*
+ * libprocps - Library to read proc filesystem
+ * Tests for version library calls
+ *
+ * Copyright 2016 Craig Small <csmall@enc.com.au>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+#include <stdlib.h>
+#include <stdio.h>
+
+#include <proc/version.h>
+#include "tests.h"
+
+int check_linux_version(void *data)
+{
+    return (procps_linux_version() > 0);
+}
+
+struct test_func tests[] = {
+    { check_linux_version, "procps_linux_version()"},
+    { NULL, NULL}
+};
+
+int main(int argc, char *argv[])
+{
+    int i;
+    struct test_func *current;
+
+    for(i=0; tests[i].func != NULL; i++) {
+        current = &tests[i];
+        if (!current->func(NULL)) {
+            fprintf(stderr, "FAIL: %s\n", current->name);
+            return EXIT_FAILURE;
+        } else {
+            fprintf(stderr, "PASS: %s\n", current->name);
+        }
+    }
+    return EXIT_SUCCESS;
+}
+
+