func (*simplestreamsSuite) TestFilterRemovesNonMatches(c *gc.C) {
array := simplestreams.IndexMetadataSlice{&simplestreams.IndexMetadata{}}
c.Check(
simplestreams.Filter(array, func(*simplestreams.IndexMetadata) bool { return false }),
gc.HasLen,
0)
}
func (*simplestreamsSuite) TestFilterReturnsNothingForEmptyArray(c *gc.C) {
empty := simplestreams.IndexMetadataSlice{}
c.Check(
simplestreams.Filter(empty, func(*simplestreams.IndexMetadata) bool { return true }),
gc.HasLen,
0)
}
func (*simplestreamsSuite) TestFilterIncludesMatches(c *gc.C) {
metadata := simplestreams.IndexMetadata{}
array := simplestreams.IndexMetadataSlice{&metadata}
c.Check(
simplestreams.Filter(array, func(*simplestreams.IndexMetadata) bool { return true }),
gc.DeepEquals,
simplestreams.IndexMetadataSlice{&metadata})
}
func (*simplestreamsSuite) TestFilterPreservesOrder(c *gc.C) {
array := simplestreams.IndexMetadataSlice{
&simplestreams.IndexMetadata{CloudName: "aws"},
&simplestreams.IndexMetadata{CloudName: "maas"},
&simplestreams.IndexMetadata{CloudName: "openstack"},
}
c.Check(
simplestreams.Filter(array, func(metadata *simplestreams.IndexMetadata) bool { return true }),
gc.DeepEquals,
array)
}
func (*simplestreamsSuite) TestFilterCombinesMatchesAndNonMatches(c *gc.C) {
array := simplestreams.IndexMetadataSlice{
&simplestreams.IndexMetadata{Format: "1.0"},
&simplestreams.IndexMetadata{Format: "1.1"},
&simplestreams.IndexMetadata{Format: "2.0"},
&simplestreams.IndexMetadata{Format: "2.1"},
}
dotOFormats := simplestreams.Filter(array, func(metadata *simplestreams.IndexMetadata) bool {
return strings.HasSuffix(metadata.Format, ".0")
})
c.Check(dotOFormats, gc.DeepEquals, simplestreams.IndexMetadataSlice{array[0], array[2]})
}
func (*simplestreamsSuite) TestFilterLeavesOriginalUnchanged(c *gc.C) {
item1 := simplestreams.IndexMetadata{CloudName: "aws"}
item2 := simplestreams.IndexMetadata{CloudName: "openstack"}
array := simplestreams.IndexMetadataSlice{&item1, &item2}
result := simplestreams.Filter(array, func(metadata *simplestreams.IndexMetadata) bool {
return metadata.CloudName == "aws"
})
// This exercises both the "leave out" and the "include" code paths.
c.Assert(result, gc.HasLen, 1)
// The original, however, has not changed.
c.Assert(array, gc.HasLen, 2)
c.Check(array, gc.DeepEquals, simplestreams.IndexMetadataSlice{&item1, &item2})
}