Add fixture for gleam support

lib/mix/test/fixtures/gleam_dep/.gitignore

@@ -0,0 +1,4 @@
+*.beam
+*.ez
+/build
+erl_crash.dump

lib/mix/test/fixtures/gleam_dep/gleam.toml

@@ -0,0 +1,20 @@
+name = "gleam_dep"
+version = "1.0.0"
+
+# Fill out these fields if you intend to generate HTML documentation or publish
+# your project to the Hex package manager.
+#
+# description = ""
+# licences = ["Apache-2.0"]
+# repository = { type = "github", user = "", repo = "" }
+# links = [{ title = "Website", href = "" }]
+#
+# For a full reference of all the available options, you can have a look at
+# https://gleam.run/writing-gleam/gleam-toml/.
+
+[dependencies]
+gleam_stdlib = ">= 0.44.0 and < 2.0.0"
+gleam_otp = ">= 0.16.1 and < 1.0.0"
+
+[dev-dependencies]
+gleeunit = ">= 1.0.0 and < 2.0.0"

lib/mix/test/fixtures/gleam_dep/manifest.toml

@@ -0,0 +1,14 @@
+# This file was generated by Gleam
+# You typically do not need to edit this file
+
+packages = [
+  { name = "gleam_erlang", version = "0.34.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_erlang", source = "hex", outer_checksum = "0C38F2A128BAA0CEF17C3000BD2097EB80634E239CE31A86400C4416A5D0FDCC" },
+  { name = "gleam_otp", version = "0.16.1", build_tools = ["gleam"], requirements = ["gleam_erlang", "gleam_stdlib"], otp_app = "gleam_otp", source = "hex", outer_checksum = "50DA1539FC8E8FA09924EB36A67A2BBB0AD6B27BCDED5A7EF627057CF69D035E" },
+  { name = "gleam_stdlib", version = "0.54.0", build_tools = ["gleam"], requirements = [], otp_app = "gleam_stdlib", source = "hex", outer_checksum = "723BA61A2BAE8D67406E59DD88CEA1B3C3F266FC8D70F64BE9FEC81B4505B927" },
+  { name = "gleeunit", version = "1.3.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleeunit", source = "hex", outer_checksum = "0E6C83834BA65EDCAAF4FE4FB94AC697D9262D83E6F58A750D63C9F6C8A9D9FF" },
+]
+
+[requirements]
+gleam_otp = { version = ">= 0.16.1 and < 1.0.0" }
+gleam_stdlib = { version = ">= 0.44.0 and < 2.0.0" }
+gleeunit = { version = ">= 1.0.0 and < 2.0.0" }

lib/mix/test/fixtures/gleam_dep/src/gleam_dep.gleam

@@ -0,0 +1,3 @@
+pub fn main() {
+  True
+}

lib/mix/test/test_helper.exs

@@ -272,6 +272,15 @@ Enum.each(fixtures, fn fixture ->
   File.cp_r!(source, dest)
 end)
 
+## Set up Gleam fixtures
+
+fixture = "gleam_dep"
+
+source = MixTest.Case.fixture_path(fixture)
+dest = MixTest.Case.tmp_path(fixture)
+File.mkdir_p!(dest)
+File.cp_r!(source, dest)
+
 ## Set up Git fixtures
 
 System.cmd("git", ~w[config --global user.email mix@example.com])