Unit tests, extract init_args from main, add option to README

freqtrade/tests/test_watchdog.py

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+from freqtrade.watchdog import Watchdog
+
+
+def test_watchdog_timeout(caplog):
+    watchdog = Watchdog(1)
+    assert(watchdog.run(0) is False)
+    log = ["Watchdog started", "Kill process due to timeout"]
+    for line in log:
+        assert line in caplog.text
+
+
+def test_watchdog_kill(caplog):
+    watchdog = Watchdog(1)
+    watchdog.exit_gracefully(1, 0)
+    assert(watchdog.run(0) is False)
+    log = ["Watchdog started", "Watchdog stopped"]
+    for line in log:
+        assert line in caplog.text