Add test case for nanopb#422 (nanopb package name option)

tests/package_name_nanopb/SConscript

@@ -0,0 +1,40 @@
+# Check that alltypes test case works also when the .proto file defines
+# a package name using the (nanopb_fileopt).package option.
+
+Import("env")
+
+def set_pkgname(src, dst, pkgname):
+    data = open(str(src)).read()
+    placeholder = '// package name placeholder'
+    assert placeholder in data
+    data = data.replace(placeholder, 'package foopkg;\n' +
+                                     'import "nanopb.proto";\n' +
+                                     'option (nanopb_fileopt).package="%s";' % pkgname)
+    open(str(dst), 'w').write(data)
+
+# Build a modified alltypes.proto
+env.Command("alltypes.proto", "#alltypes/alltypes.proto",
+            lambda target, source, env: set_pkgname(source[0], target[0], 'test.package'))
+env.Command("alltypes.options", "#alltypes/alltypes.options", Copy("$TARGET", "$SOURCE"))
+env.NanopbProto(["alltypes", "alltypes.options"])
+
+# Build a modified encode_alltypes.c
+def modify_c(target, source, env):
+    '''Add package name to type names in .c file.'''
+
+    data = open(str(source[0]), 'r').read()
+
+    type_names = ['AllTypes', 'MyEnum', 'HugeEnum']
+    for name in type_names:
+        data = data.replace(name, 'test_package_' + name)
+
+    open(str(target[0]), 'w').write(data)
+    return 0
+env.Command("encode_alltypes.c", "#alltypes/encode_alltypes.c", modify_c)
+
+# Encode and compare results to original alltypes testcase
+enc = env.Program(["encode_alltypes.c", "alltypes.pb.c", "$COMMON/pb_encode.o", "$COMMON/pb_common.o"])
+refdec = "$BUILD/alltypes/decode_alltypes$PROGSUFFIX"
+env.RunTest(enc)
+env.Compare(["encode_alltypes.output", "$BUILD/alltypes/encode_alltypes.output"])
+