add test case for installed executable

Author: withered-magic

examples/git_gem/.bazelversion

@@ -1 +1 @@
-8.5.1
+../../.bazelversion

examples/git_gem/BUILD

@@ -1,15 +1,21 @@
 load("@rules_ruby//ruby:defs.bzl", "rb_binary", "rb_test")
 
-# A simple binary that uses the Git-sourced hello_world gem
 rb_binary(
     name = "greeter",
     srcs = ["greeter.rb"],
     deps = ["@bundle"],
 )
 
-# Test that verifies the Git-sourced gem works correctly
 rb_test(
     name = "greeter_test",
     srcs = ["greeter_test.rb"],
     deps = ["@bundle"],
 )
+
+rb_test(
+    name = "hello_world_bin_test",
+    main = "hello_world_bin_test.rb",
+    srcs = ["hello_world_bin_test.rb"],
+    args = ["$(rlocationpath @bundle//bin:hello_world)"],
+    data = ["@bundle//bin:hello_world"],
+)

examples/git_gem/Gemfile

@@ -4,6 +4,6 @@ source "https://rubygems.org"
 
 # Reference hello_world gem from the rules_ruby repository on GitHub
 gem "hello_world",
-    git: "https://github.com/bazel-contrib/rules_ruby.git",
+    git: "https://github.com/withered-magic/rules_ruby.git",
     glob: "examples/deep_gem/hello_world/*.gemspec",
-    ref: "2c98fcaf4d60007a351c6e9a15678d64e1cc4cda"
+    ref: "f6762ba5610170f69f28cdd5523697c357ed95e2"

examples/git_gem/Gemfile.lock

@@ -1,7 +1,7 @@
 GIT
-  remote: https://github.com/bazel-contrib/rules_ruby.git
-  revision: 2c98fcaf4d60007a351c6e9a15678d64e1cc4cda
-  ref: 2c98fcaf4d60007a351c6e9a15678d64e1cc4cda
+  remote: https://github.com/withered-magic/rules_ruby.git
+  revision: f6762ba5610170f69f28cdd5523697c357ed95e2
+  ref: f6762ba5610170f69f28cdd5523697c357ed95e2
   glob: examples/deep_gem/hello_world/*.gemspec
   specs:
     hello_world (0.0.0)

examples/git_gem/MODULE.bazel

@@ -12,7 +12,6 @@ ruby.toolchain(
     version_file = "//:.ruby-version",
 )
 use_repo(ruby, "ruby")
-
 ruby.bundle_fetch(
     name = "bundle",
     gemfile = "//:Gemfile",

examples/git_gem/hello_world_bin_test.rb

@@ -0,0 +1,5 @@
+binary = File.join(ENV["TEST_SRCDIR"], ARGV[0])
+output = `#{binary} 2>&1`
+raise "Binary exited with code #{$?.exitstatus}: #{output}" unless $?.success?
+raise "Expected 'Hello, World', got '#{output.strip}'" unless output.include?("Hello, World")
+puts "PASS: Got expected output 'Hello, World'"