diff --git a/test/fixtures/AllPlugins/.appveyor.yml.txt b/test/fixtures/AllPlugins/.appveyor.yml
similarity index 100%
rename from test/fixtures/AllPlugins/.appveyor.yml.txt
rename to test/fixtures/AllPlugins/.appveyor.yml
diff --git a/test/fixtures/AllPlugins/.cirrus.yml.txt b/test/fixtures/AllPlugins/.cirrus.yml
similarity index 100%
rename from test/fixtures/AllPlugins/.cirrus.yml.txt
rename to test/fixtures/AllPlugins/.cirrus.yml
diff --git a/test/fixtures/AllPlugins/.gitignore.txt b/test/fixtures/AllPlugins/.gitignore
similarity index 100%
rename from test/fixtures/AllPlugins/.gitignore.txt
rename to test/fixtures/AllPlugins/.gitignore
diff --git a/test/fixtures/AllPlugins/.gitlab-ci.yml.txt b/test/fixtures/AllPlugins/.gitlab-ci.yml
similarity index 100%
rename from test/fixtures/AllPlugins/.gitlab-ci.yml.txt
rename to test/fixtures/AllPlugins/.gitlab-ci.yml
diff --git a/test/fixtures/AllPlugins/.travis.yml.txt b/test/fixtures/AllPlugins/.travis.yml
similarity index 100%
rename from test/fixtures/AllPlugins/.travis.yml.txt
rename to test/fixtures/AllPlugins/.travis.yml
diff --git a/test/fixtures/AllPlugins/CITATION.bib.txt b/test/fixtures/AllPlugins/CITATION.bib
similarity index 100%
rename from test/fixtures/AllPlugins/CITATION.bib.txt
rename to test/fixtures/AllPlugins/CITATION.bib
diff --git a/test/fixtures/AllPlugins/LICENSE.txt b/test/fixtures/AllPlugins/LICENSE
similarity index 100%
rename from test/fixtures/AllPlugins/LICENSE.txt
rename to test/fixtures/AllPlugins/LICENSE
diff --git a/test/fixtures/AllPlugins/Manifest.toml.txt b/test/fixtures/AllPlugins/Manifest.toml
similarity index 100%
rename from test/fixtures/AllPlugins/Manifest.toml.txt
rename to test/fixtures/AllPlugins/Manifest.toml
diff --git a/test/fixtures/AllPlugins/Project.toml.txt b/test/fixtures/AllPlugins/Project.toml
similarity index 100%
rename from test/fixtures/AllPlugins/Project.toml.txt
rename to test/fixtures/AllPlugins/Project.toml
diff --git a/test/fixtures/AllPlugins/README.md.txt b/test/fixtures/AllPlugins/README.md
similarity index 100%
rename from test/fixtures/AllPlugins/README.md.txt
rename to test/fixtures/AllPlugins/README.md
diff --git a/test/fixtures/AllPlugins/docs/Manifest.toml.txt b/test/fixtures/AllPlugins/docs/Manifest.toml
similarity index 100%
rename from test/fixtures/AllPlugins/docs/Manifest.toml.txt
rename to test/fixtures/AllPlugins/docs/Manifest.toml
diff --git a/test/fixtures/AllPlugins/docs/Project.toml.txt b/test/fixtures/AllPlugins/docs/Project.toml
similarity index 100%
rename from test/fixtures/AllPlugins/docs/Project.toml.txt
rename to test/fixtures/AllPlugins/docs/Project.toml
diff --git a/test/fixtures/AllPlugins/docs/make.jl.txt b/test/fixtures/AllPlugins/docs/make.jl
similarity index 100%
rename from test/fixtures/AllPlugins/docs/make.jl.txt
rename to test/fixtures/AllPlugins/docs/make.jl
diff --git a/test/fixtures/AllPlugins/docs/src/index.md.txt b/test/fixtures/AllPlugins/docs/src/index.md
similarity index 100%
rename from test/fixtures/AllPlugins/docs/src/index.md.txt
rename to test/fixtures/AllPlugins/docs/src/index.md
diff --git a/test/fixtures/AllPlugins/src/AllPlugins.jl.txt b/test/fixtures/AllPlugins/src/AllPlugins.jl
similarity index 100%
rename from test/fixtures/AllPlugins/src/AllPlugins.jl.txt
rename to test/fixtures/AllPlugins/src/AllPlugins.jl
diff --git a/test/fixtures/AllPlugins/test/runtests.jl.txt b/test/fixtures/AllPlugins/test/runtests.jl
similarity index 100%
rename from test/fixtures/AllPlugins/test/runtests.jl.txt
rename to test/fixtures/AllPlugins/test/runtests.jl
diff --git a/test/fixtures/Basic/.gitignore.txt b/test/fixtures/Basic/.gitignore
similarity index 100%
rename from test/fixtures/Basic/.gitignore.txt
rename to test/fixtures/Basic/.gitignore
diff --git a/test/fixtures/Basic/LICENSE.txt b/test/fixtures/Basic/LICENSE
similarity index 100%
rename from test/fixtures/Basic/LICENSE.txt
rename to test/fixtures/Basic/LICENSE
diff --git a/test/fixtures/Basic/Manifest.toml.txt b/test/fixtures/Basic/Manifest.toml
similarity index 100%
rename from test/fixtures/Basic/Manifest.toml.txt
rename to test/fixtures/Basic/Manifest.toml
diff --git a/test/fixtures/Basic/Project.toml.txt b/test/fixtures/Basic/Project.toml
similarity index 100%
rename from test/fixtures/Basic/Project.toml.txt
rename to test/fixtures/Basic/Project.toml
diff --git a/test/fixtures/Basic/README.md.txt b/test/fixtures/Basic/README.md
similarity index 100%
rename from test/fixtures/Basic/README.md.txt
rename to test/fixtures/Basic/README.md
diff --git a/test/fixtures/Basic/src/Basic.jl.txt b/test/fixtures/Basic/src/Basic.jl
similarity index 100%
rename from test/fixtures/Basic/src/Basic.jl.txt
rename to test/fixtures/Basic/src/Basic.jl
diff --git a/test/fixtures/Basic/test/runtests.jl.txt b/test/fixtures/Basic/test/runtests.jl
similarity index 100%
rename from test/fixtures/Basic/test/runtests.jl.txt
rename to test/fixtures/Basic/test/runtests.jl
diff --git a/test/reference.jl b/test/reference.jl
index 3a1eaec..305c140 100644
--- a/test/reference.jl
+++ b/test/reference.jl
@@ -9,8 +9,7 @@ function test_all(pkg::AbstractString; kwargs...)
     with_pkg(t, pkg) do pkg
         pkg_dir = joinpath(t.dir, pkg)
         foreach(readlines(`git -C $pkg_dir ls-files`)) do f
-            # All fixture files are .txt so that ReferenceTests can handle them.
-            reference = joinpath(@__DIR__, "fixtures", pkg, f * ".txt")
+            reference = joinpath(@__DIR__, "fixtures", pkg, f)
             observed = read(joinpath(pkg_dir, f), String)
             @test_reference reference observed
         end