Add Python tests for 2 Sony temperature tags

Check if pretty printing outputs `"n/a"` when used with unsupported
camera models.

tests/bugfixes/github/test_pr_1926.py

@@ -0,0 +1,25 @@
+# -*- coding: utf-8 -*-
+
+from system_tests import CaseMeta, path
+
+class Sony2FpAmbientTemperatureUnsupportedTagTest(metaclass=CaseMeta):
+
+    filename = path("$data_path/exiv2-bug1153Ja.exv")
+    commands = ["$exiv2 -pa --grep AmbientTemperature $filename"]
+
+    stdout = ["""Exif.Sony2Fp.AmbientTemperature              SByte       1  n/a
+"""
+    ]
+    stderr = [""]
+    retval = [0]
+
+class SonyMisc1CameraTemperatureUnsupportedTagTest(metaclass=CaseMeta):
+
+    filename = path("$data_path/exiv2-bug1145a.exv")
+    commands = ["$exiv2 -pa --grep SonyMisc1 $filename"]
+
+    stdout = ["""Exif.SonyMisc1.CameraTemperature             SByte       1  n/a
+"""
+    ]
+    stderr = [""]
+    retval = [0]