only write compiler for specific test

Author: SteffenDE

lib/mix/test/mix_test.exs

@@ -43,7 +43,7 @@ defmodule MixTest do
       assert Protocol.consolidated?(InstallTest.Protocol)
 
       assert_received {:mix_shell, :info, ["==> install_test"]}
-      assert_received {:mix_shell, :info, ["Compiling 3 files (.ex)"]}
+      assert_received {:mix_shell, :info, ["Compiling 2 files (.ex)"]}
       assert_received {:mix_shell, :info, ["Generated install_test app"]}
       refute_received _
 
@@ -71,7 +71,7 @@ defmodule MixTest do
 
       assert File.dir?(Path.join(tmp_dir, "installs"))
       assert_received {:mix_shell, :info, ["==> install_test"]}
-      assert_received {:mix_shell, :info, ["Compiling 3 files (.ex)"]}
+      assert_received {:mix_shell, :info, ["Compiling 2 files (.ex)"]}
       assert_received {:mix_shell, :info, ["Generated install_test app"]}
       refute_received _
 
@@ -361,7 +361,7 @@ defmodule MixTest do
         ])
 
         assert_received {:mix_shell, :info, ["==> install_test"]}
-        assert_received {:mix_shell, :info, ["Compiling 3 files (.ex)"]}
+        assert_received {:mix_shell, :info, ["Compiling 2 files (.ex)"]}
         assert_received {:mix_shell, :info, ["Generated install_test app"]}
         refute_received _
 
@@ -431,6 +431,20 @@ defmodule MixTest do
     end
 
     test "custom compilers", %{tmp_dir: tmp_dir} do
+      File.mkdir_p!("#{tmp_dir}/install_test/lib/mix/tasks/compile/")
+
+      File.write!("#{tmp_dir}/install_test/lib/mix/tasks/compile/install_test.ex", """
+      defmodule Mix.Tasks.Compile.InstallTest do
+        use Mix.Task.Compiler
+
+        def run(_args) do
+          Mix.shell().info("Hello from custom compiler!")
+
+          :noop
+        end
+      end
+      """)
+
       Mix.install(
         [
           {:install_test, path: Path.join(tmp_dir, "install_test")}
@@ -493,7 +507,7 @@ defmodule MixTest do
       end)
     end
 
-    defp test_project(%{tmp_dir: tmp_dir}) do
+    defp test_project(%{tmp_dir: tmp_dir} = context) do
       path = :code.get_path()
 
       on_exit(fn ->
@@ -532,20 +546,6 @@ defmodule MixTest do
       end
       """)
 
-      File.mkdir_p!("#{tmp_dir}/install_test/lib/mix/tasks/compile/")
-
-      File.write!("#{tmp_dir}/install_test/lib/mix/tasks/compile/install_test.ex", """
-      defmodule Mix.Tasks.Compile.InstallTest do
-        use Mix.Task.Compiler
-
-        def run(_args) do
-          Mix.shell().info("Hello from custom compiler!")
-
-          :noop
-        end
-      end
-      """)
-
       [tmp_dir: tmp_dir]
     end