From 36648dc4b3c095a7c436245be00fc68c21fa8370 Mon Sep 17 00:00:00 2001
From: David Widmann <devmotion@users.noreply.github.com>
Date: Thu, 10 Feb 2022 23:21:36 +0100
Subject: [PATCH] Add regression test for changes of `showable` (#187) (#189)

---
 test/runtests.jl | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/test/runtests.jl b/test/runtests.jl
index 9d34427..fbd7fc1 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -799,6 +799,13 @@ end end
                 #-
                 DisplayAs.HTML(MD())
                 #-
+                struct Plain end
+                Base.showable(::MIME, ::Plain) = false
+                Base.showable(::MIME"text/plain", ::Plain) = true
+                Base.show(::IO, ::MIME, ::Plain) = error("only plain output supported")
+                Base.show(io::IO, ::MIME"text/plain", ::Plain) = print(io, "Plain")
+                Plain()
+                #-
                 print("hello"); print(stdout, ", "); print(stderr, "world")
                 #-
                 print("hej, världen")
@@ -820,6 +827,7 @@ end end
             @test occursin(r"!\[\]\(\d+\.svg\)", markdown) # image/svg+xml, fredrikekre/Literate.jl#182
             @test occursin("# MD", markdown) # text/markdown
             @test occursin("```@raw html\n<h1>MD</h1>\n```", markdown) # text/html
+            @test occursin("```\nPlain\n```", markdown) # text/plain, fredrikekre/Literate#187
             @test occursin("```\nhello, world\n```", markdown) # stdout/stderr
             @test occursin("```\n42\n```", markdown) # result over stdout/stderr
             @test !occursin("246", markdown) # empty output because trailing ;