fix missing import in change message

Transported values in a change must be converted first.
As this is only relevant for the exotic "scaled" and "blob"
datatypes, this was not detected yet.

- add tests
- suppress warning PytestUnhandledThreadExceptionWarning in tests
+ change import_value methods to raise no other exceptions than
  WrongTypeError and RangeError
+ simplify Command.do: as import_value already raises the
  appropriate error, no more try/except is needed

Change-Id: I299e511468dc0fcecff4c20cf8a917da38b70786
Reviewed-on: https://forge.frm2.tum.de/review/c/secop/frappy/+/32743
Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de>
Reviewed-by: Enrico Faulhaber <enrico.faulhaber@frm2.tum.de>
Reviewed-by: Alexander Zaft <a.zaft@fz-juelich.de>
Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>

test/test_datatypes.py

@@ -46,7 +46,6 @@ def test_DataType():
     with pytest.raises(NotImplementedError):
         dt('')
     dt.export_value('')
-    dt.import_value('')
 
 
 def test_FloatRange():
@@ -62,8 +61,12 @@ def test_FloatRange():
     dt(-9)  # convert, but do not check limits
     with pytest.raises(WrongTypeError):
         dt('XX')
+    with pytest.raises(WrongTypeError):
+        dt.import_value('XX')
     with pytest.raises(WrongTypeError):
         dt([19, 'X'])
+    with pytest.raises(WrongTypeError):
+        dt.import_value([19, 'X'])
     dt(1)
     dt(0)
     dt(13.14 - 10)  # raises an error, if resolution is not handled correctly
@@ -115,12 +118,20 @@ def test_IntRange():
     dt(-9)  # convert, but do not check limits
     with pytest.raises(WrongTypeError):
         dt('XX')
+    with pytest.raises(WrongTypeError):
+        dt.import_value('XX')
     with pytest.raises(WrongTypeError):
         dt([19, 'X'])
+    with pytest.raises(WrongTypeError):
+        dt.import_value([19, 'X'])
     with pytest.raises(WrongTypeError):
         dt(1.3)
+    with pytest.raises(WrongTypeError):
+        dt.import_value(1.3)
     with pytest.raises(WrongTypeError):
         dt('1.3')
+    with pytest.raises(WrongTypeError):
+        dt.import_value('1.3')
     dt(1)
     dt(0)
     with pytest.raises(ProgrammingError):
@@ -153,8 +164,12 @@ def test_ScaledInteger():
     dt(-9)  # convert, but do not check limits
     with pytest.raises(WrongTypeError):
         dt('XX')
+    with pytest.raises(WrongTypeError):
+        dt.import_value('XX')
     with pytest.raises(WrongTypeError):
         dt([19, 'X'])
+    with pytest.raises(WrongTypeError):
+        dt.import_value([19, 'X'])
     dt(1)
     dt(0)
     with pytest.raises(ProgrammingError):
@@ -218,12 +233,20 @@ def test_EnumType():
 
     with pytest.raises(RangeError):
         dt(9)
+    with pytest.raises(RangeError):
+        dt.import_value(9)
     with pytest.raises(RangeError):
         dt(-9)
+    with pytest.raises(RangeError):
+        dt.import_value(-9)
     with pytest.raises(RangeError):
         dt('XX')
+    with pytest.raises(RangeError):
+        dt.import_value('XX')
     with pytest.raises(WrongTypeError):
         dt([19, 'X'])
+    with pytest.raises(WrongTypeError):
+        dt.import_value([19, 'X'])
 
     assert dt('a') == 3
     assert dt('stuff') == 1
@@ -266,6 +289,10 @@ def test_BLOBType():
         dt(b'abcdefghijklmno')
     with pytest.raises(WrongTypeError):
         dt('abcd')
+    with pytest.raises(WrongTypeError):
+        dt.import_value('ab')
+    with pytest.raises(WrongTypeError):
+        dt.import_value(b'xxx')
     assert dt(b'abcd') == b'abcd'
 
     dt.setProperty('minbytes', 1)