antlr: test added

Closes #35511.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

1 files changed, 20 insertions, 2 deletions

diff --git a/Library/Formula/antlr.rb b/Library/Formula/antlr.rb
index 003b41046..3533b0217 100644
--- a/Library/Formula/antlr.rb
+++ b/Library/Formula/antlr.rb
@@ -1,5 +1,3 @@
-require "formula"
-
 class Antlr < Formula
   homepage "http://www.antlr.org/"
   url "http://www.antlr.org/download/antlr-4.4-complete.jar"
@@ -13,4 +11,24 @@ class Antlr < Formula
       java -classpath #{prefix}/antlr-#{version}-complete.jar:. org.antlr.v4.runtime.misc.TestRig "$@"
     EOS
   end
+
+  test do
+    path = testpath/"Expr.g4"
+    path.write <<-EOS.undent
+    grammar Expr;
+    prog:\t(expr NEWLINE)* ;
+    expr:\texpr ('*'|'/') expr
+        |\texpr ('+'|'-') expr
+        |\tINT
+        |\t'(' expr ')'
+        ;
+    NEWLINE :\t[\\r\\n]+ ;
+    INT     :\t[0-9]+ ;
+    EOS
+    ENV.prepend "CLASSPATH", "#{prefix}/antlr-#{version}-complete.jar", ":"
+    ENV.prepend "CLASSPATH", ".", ":"
+    system "#{bin}/antlr4", "Expr.g4"
+    system "javac", *Dir["Expr*.java"]
+    assert_match(/^$/, pipe_output("#{bin}/grun Expr prog", "22+20\n"))
+  end
 end