javarepl: improve test by running a short program

Closes #29478.

Signed-off-by: Misty De Meo <mistydemeo@gmail.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/Library/Formula/javarepl.rb b/Library/Formula/javarepl.rb
index 0126fedb7..4e691b9d2 100644
--- a/Library/Formula/javarepl.rb
+++ b/Library/Formula/javarepl.rb
@@ -11,6 +11,10 @@ class Javarepl < Formula
   end
 
   test do
-    system "echo :quit | javarepl"
+    IO.popen(bin/"javarepl", "w+") do |pipe|
+      pipe.write "System.out.println(64*1024)\n:quit\n"
+      pipe.close_write
+      assert pipe.read.include?("65536")
+    end
   end
 end