qapi-tests: New tests for union, alternate command arguments

A command's 'data' must be a struct type, given either as a
dictionary, or as struct type name.

Existing test case data-int.json covers simple type 'int'.  Add test
cases for type names referring to union and alternate types.

The latter is caught (good), but the former is not (bug).

Events have the same problem, but since they get checked by the same
code, we don't bother to duplicate the tests.
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>

tests/Makefile

@@ -231,7 +231,8 @@ check-qapi-schema-y := $(addprefix tests/qapi-schema/, \
 	type-bypass.json type-bypass-no-gen.json type-bypass-bad-gen.json \
 	args-array-empty.json args-array-unknown.json args-int.json \
 	args-unknown.json args-member-unknown.json args-member-array.json \
-	args-member-array-bad.json returns-array-bad.json returns-int.json \
+	args-member-array-bad.json args-alternate.json args-union.json \
+	returns-array-bad.json returns-int.json \
 	returns-unknown.json returns-alternate.json returns-whitelist.json \
 	missing-colon.json missing-comma-list.json missing-comma-object.json \
 	nested-struct-data.json nested-struct-returns.json non-objects.json \

tests/qapi-schema/args-alternate.err

+tests/qapi-schema/args-alternate.json:3: 'data' for command 'oops' cannot use alternate type 'Alt'

tests/qapi-schema/args-alternate.exit

+1

tests/qapi-schema/args-alternate.json

+# we do not allow alternate arguments
+{ 'alternate': 'Alt', 'data': { 'case1': 'int', 'case2': 'str' } }
+{ 'command': 'oops', 'data': 'Alt' }

tests/qapi-schema/args-union.exit

+0

tests/qapi-schema/args-union.json

+# FIXME we should reject union arguments
+# TODO should we support this?
+{ 'union': 'Uni', 'data': { 'case1': 'int', 'case2': 'str' } }
+{ 'command': 'oops', 'data': 'Uni' }

tests/qapi-schema/args-union.out

+[OrderedDict([('union', 'Uni'), ('data', OrderedDict([('case1', 'int'), ('case2', 'str')]))]),
+ OrderedDict([('command', 'oops'), ('data', 'Uni')])]
+[{'enum_name': 'UniKind', 'enum_values': None}]
+[]