add proc_pid_stat tests

tests/fixtures/linux-proc/pid_stat.json

@@ -0,0 +1 @@
+{"pid":1,"comm":"systemd","state":"S","ppid":0,"pgrp":1,"session":1,"tty_nr":0,"tpg_id":-1,"flags":4194560,"minflt":23478,"cminflt":350218,"majflt":99,"cmajflt":472,"utime":107,"stime":461,"cutime":2672,"cstime":4402,"priority":20,"nice":0,"num_threads":1,"itrealvalue":0,"starttime":128,"vsize":174063616,"rss":3313,"rsslim":18446744073709551615,"startcode":94188219072512,"endcode":94188219899461,"startstack":140725059845296,"kstkeep":0,"kstkeip":0,"signal":0,"blocked":671173123,"sigignore":4096,"sigcatch":1260,"wchan":1,"nswap":0,"cnswap":0,"exit_signal":17,"processor":0,"rt_priority":0,"policy":0,"delayacct_blkio_ticks":18,"guest_time":0,"cguest_time":0,"start_data":94188220274448,"end_data":94188220555504,"start_brk":94188243599360,"arg_start":140725059845923,"arg_end":140725059845934,"env_start":140725059845934,"env_end":140725059846125,"exit_code":0,"state_pretty":"Sleeping in an interruptible wait"}

tests/test_proc_pid_stat.py

@@ -0,0 +1,44 @@
+import os
+import unittest
+import json
+from typing import Dict
+import jc.parsers.proc_pid_stat
+
+THIS_DIR = os.path.dirname(os.path.abspath(__file__))
+
+
+class MyTests(unittest.TestCase):
+    f_in: Dict = {}
+    f_json: Dict = {}
+
+    @classmethod
+    def setUpClass(cls):
+        fixtures = {
+            'proc_pid_stat': (
+                'fixtures/linux-proc/pid_stat',
+                'fixtures/linux-proc/pid_stat.json')
+        }
+
+        for file, filepaths in fixtures.items():
+            with open(os.path.join(THIS_DIR, filepaths[0]), 'r', encoding='utf-8') as a, \
+                 open(os.path.join(THIS_DIR, filepaths[1]), 'r', encoding='utf-8') as b:
+                cls.f_in[file] = a.read()
+                cls.f_json[file] = json.loads(b.read())
+
+
+    def test_proc_pid_stat_nodata(self):
+        """
+        Test 'proc_pid_stat' with no data
+        """
+        self.assertEqual(jc.parsers.proc_pid_stat.parse('', quiet=True), {})
+
+    def test_proc_pid_stat(self):
+        """
+        Test '/proc/<pid>/stat'
+        """
+        self.assertEqual(jc.parsers.proc_pid_stat.parse(self.f_in['proc_pid_stat'], quiet=True),
+                                                        self.f_json['proc_pid_stat'])
+
+
+if __name__ == '__main__':
+    unittest.main()