Merge pull request #43024 from JuliaLang/ksh/chartests

A few tests for Char and transcode

Author: kshyatt

test/ccall.jl

@@ -1803,6 +1803,11 @@ ccall_with_undefined_lib() = ccall((:time, xx_nOt_DeFiNeD_xx), Cint, (Ptr{Cvoid}
     @test b16 == b
 end
 
+@testset "transcode String to String" begin
+    a = "Julia strings and things"
+    @test transcode(String, a) === a
+end
+
 # issue 33413
 @testset "cglobal lowering" begin
     # crash in cglobal33413_ptrinline[_notype]() specifically requires the library pointer be

test/char.jl

@@ -2,6 +2,7 @@
 
 @testset "basic properties" begin
 
+    @test typemax(Char) == reinterpret(Char, typemax(UInt32))
     @test typemin(Char) == Char(0)
     @test ndims(Char) == 0
     @test getindex('a', 1) == 'a'
@@ -248,13 +249,17 @@ Base.codepoint(c::ASCIIChar) = reinterpret(UInt8, c)
 
 @testset "abstractchar" begin
     @test AbstractChar('x') === AbstractChar(UInt32('x')) === 'x'
+    @test convert(AbstractChar, 2.0) == Char(2)
 
     @test isascii(ASCIIChar('x'))
     @test ASCIIChar('x') < 'y'
     @test ASCIIChar('x') == 'x' === Char(ASCIIChar('x')) === convert(Char, ASCIIChar('x'))
     @test ASCIIChar('x')^3 == "xxx"
     @test repr(ASCIIChar('x')) == "'x'"
     @test string(ASCIIChar('x')) == "x"
+    @test length(ASCIIChar('x')) == 1
+    @test !isempty(ASCIIChar('x'))
+    @test eltype(ASCIIChar) == ASCIIChar
     @test_throws MethodError write(IOBuffer(), ASCIIChar('x'))
     @test_throws MethodError read(IOBuffer('x'), ASCIIChar)
 end