Add test for upper/lower/titlecase and fix call

base/strings/annotated.jl

@@ -384,7 +384,7 @@ a vector of region–annotation tuples.
 In accordance with the semantics documented in [`AnnotatedString`](@ref), the
 order of annotations returned matches the order in which they were applied.
 
-See also: `annotate!`.
+See also: [`annotate!`](@ref).
 """
 annotations(s::AnnotatedString) = s.annotations
 

base/strings/unicode.jl

@@ -6,7 +6,7 @@ module Unicode
 import Base: show, ==, hash, string, Symbol, isless, length, eltype,
              convert, isvalid, ismalformed, isoverlong, iterate,
              AnnotatedString, AnnotatedChar, annotated_chartransform,
-             @assume_effects
+             @assume_effects, annotations
 
 # whether codepoints are valid Unicode scalar values, i.e. 0-0xd7ff, 0xe000-0x10ffff
 

test/strings/annotated.jl

@@ -64,6 +64,9 @@ end
 @testset "AnnotatedChar" begin
     chr = Base.AnnotatedChar('c')
     @test chr == Base.AnnotatedChar(chr.char, Pair{Symbol, Any}[])
+    @test uppercase(chr) == Base.AnnotatedChar('C')
+    @test titlecase(chr) == Base.AnnotatedChar('C')
+    @test lowercase(Base.AnnotatedChar('C')) == chr
     str = Base.AnnotatedString("hmm", [(1:1, :attr => "h0h0"),
                                (1:2, :attr => "h0m1"),
                                (2:3, :attr => "m1m2")])