Make LoadError from running tests more obvious

lib/rake/rake_test_loader.rb

@@ -2,19 +2,23 @@
 
 # Load the test files from the command line.
 argv = ARGV.select do |argument|
-  case argument
-  when /^-/ then
-    argument
-  when /\*/ then
-    FileList[argument].to_a.each do |file|
-      require File.expand_path file
-    end
+  begin
+    case argument
+    when /^-/ then
+      argument
+    when /\*/ then
+      FileList[argument].to_a.each do |file|
+        require File.expand_path file
+      end
 
-    false
-  else
-    require File.expand_path argument
+      false
+    else
+      require File.expand_path argument
 
-    false
+      false
+    end
+  rescue LoadError => e
+    abort "\nFile does not exist: #{e.path}\n\n"
   end
 end
 

test/test_rake_rake_test_loader.rb

@@ -2,6 +2,12 @@
 
 class TestRakeRakeTestLoader < Rake::TestCase
 
+  def setup
+    super
+
+    @loader = File.join @rake_lib, 'rake/rake_test_loader.rb'
+  end
+
   def test_pattern
     orig_loaded_features = $:.dup
     FileUtils.touch "foo.rb"
@@ -10,11 +16,31 @@ def test_pattern
 
     ARGV.replace %w[foo.rb test_*.rb -v]
 
-    load File.join(@rake_lib, "rake/rake_test_loader.rb")
+    load @loader
 
     assert_equal %w[-v], ARGV
   ensure
     $:.replace orig_loaded_features
   end
 
+  def test_load_error
+    out, err = capture_io do
+      ARGV.replace %w[no_such_test_file.rb]
+
+      assert_raises SystemExit do
+        load @loader
+      end
+    end
+
+    assert_empty out
+
+    no_such_path = File.join @tempdir, 'no_such_test_file'
+
+    expected =
+      /\A\n
+       File\ does\ not\ exist:\ #{no_such_path}(\.rb)? # JRuby is different
+       \n\n\Z/x
+
+    assert_match expected, err
+  end
 end