Backfill a test for #90

Author: HoloRin

private/app_file.bzl

@@ -158,7 +158,10 @@ fi
     )
 
     return [
-        DefaultInfo(files = depset([app_file])),
+        DefaultInfo(
+            files = depset([app_file]),
+            runfiles = ctx.runfiles([app_file]),
+        ),
     ]
 
 app_file = rule(

test/app_file/BUILD.bazel

@@ -0,0 +1,15 @@
+load("@rules_erlang//:app_file.bzl", "app_file")
+
+app_file(
+    name = "app_file",
+    app_name = "myapp",
+    app_src = ["myapp.app.src"],
+    tags = ["manual"],
+)
+
+sh_test(
+    name = "test_applications_preserved",
+    srcs = [":test_applications_preserved.sh"],
+    args = ["$(location :app_file)"],
+    data = [":app_file"],
+)

test/app_file/myapp.app.src

@@ -0,0 +1,10 @@
+{application,myapp,
+             [{description,"A test app"},
+              {vsn,"0.1.0"},
+              {licenses,[]},
+              {links,[]},
+              {registered,[]},
+              {mod,{myapp_app,[]}},
+              {applications,[kernel,stdlib,crypto]},
+              {env,[{enabled,true}]},
+              {modules,[]}]}.

test/app_file/test_applications_preserved.sh

@@ -0,0 +1,5 @@
+set -euxo pipefail
+
+tree $PWD
+
+grep crypto $1