Fix rake test loader swallowing useful error information

lib/rake/rake_test_loader.rb

@@ -2,24 +2,23 @@
 
 # Load the test files from the command line.
 argv = ARGV.select do |argument|
-  begin
-    case argument
-    when /^-/ then
-      argument
-    when /\*/ then
-      FileList[argument].to_a.each do |file|
-        require File.expand_path file
-      end
+  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
+    path = File.expand_path argument
 
-      false
-    end
-  rescue LoadError => e
-    raise unless e.path
-    abort "\nFile does not exist: #{e.path}\n\n"
+    abort "\nFile does not exist: #{path}\n\n" unless File.exist?(path)
+
+    require path
+
+    false
   end
 end
 

test/test_rake_rake_test_loader.rb

@@ -24,7 +24,7 @@ def test_pattern
     $:.replace orig_loaded_features
   end
 
-  def test_load_error_from_require
+  def test_load_error_from_missing_test_file
     out, err = capture_io do
       ARGV.replace %w[no_such_test_file.rb]
 
@@ -45,6 +45,24 @@ def test_load_error_from_require
     assert_match expected, err
   end
 
+  def test_load_error_raised_implicitly
+    File.write("error_test.rb", "require 'superkalifragilisticoespialidoso'")
+    out, err = capture_io do
+      ARGV.replace %w[error_test.rb]
+
+      exc = assert_raises(LoadError) do
+        load @loader
+      end
+      if RUBY_ENGINE == "jruby"
+        assert_equal "no such file to load -- superkalifragilisticoespialidoso", exc.message
+      else
+        assert_equal "cannot load such file -- superkalifragilisticoespialidoso", exc.message
+      end
+    end
+    assert_empty out
+    assert_empty err
+  end
+
   def test_load_error_raised_explicitly
     File.write("error_test.rb", "raise LoadError, 'explicitly raised'")
     out, err = capture_io do