cvsync: add test

Closes Homebrew/homebrew#38093.

Signed-off-by: Brett Koonce <koonce@gmail.com>

Formula/cvsync.rb

@@ -1,24 +1,24 @@
-require 'formula'
-
 class Cvsync < Formula
-  homepage 'http://www.cvsync.org/'
-  url 'http://www.cvsync.org/dist/cvsync-0.24.19.tar.gz'
-  sha1 'a3c0673bf0f3b81b1eb45ac828a527d2a4e6d2f6'
+  homepage "http://www.cvsync.org/"
+  url "http://www.cvsync.org/dist/cvsync-0.24.19.tar.gz"
+  sha256 "75d99fc387612cb47141de4d59cb3ba1d2965157230f10015fbaa3a1c3b27560"
+
+  depends_on "openssl"
 
   def install
-    ENV['PREFIX'] = prefix
-    ENV['MANDIR'] = man
-    ENV['CVSYNC_DEFAULT_CONFIG'] = etc + 'cvsync.conf'
-    ENV['CVSYNCD_DEFAULT_CONFIG'] = etc + 'cvsyncd.conf'
-    ENV['HASH_TYPE'] = 'openssl'
+    ENV["PREFIX"] = prefix
+    ENV["MANDIR"] = man
+    ENV["CVSYNC_DEFAULT_CONFIG"] = etc/"cvsync.conf"
+    ENV["CVSYNCD_DEFAULT_CONFIG"] = etc/"cvsyncd.conf"
+    ENV["HASH_TYPE"] = "openssl"
 
     # Makefile from 2005 assumes Darwin doesn't define `socklen_t' and defines
     # it with a CC macro parameter making gcc unhappy about double define.
-    inreplace 'mk/network.mk',
-      /^CFLAGS \+= \-Dsocklen_t=int/, ''
+    inreplace "mk/network.mk",
+      /^CFLAGS \+= \-Dsocklen_t=int/, ""
 
     # Remove owner and group parameters from install.
-    inreplace 'mk/base.mk',
+    inreplace "mk/base.mk",
       /^INSTALL_(.{3})_OPTS\?=.*/, 'INSTALL_\1_OPTS?= -c -m ${\1MODE}'
 
     # These paths must exist or "make install" fails.
@@ -26,6 +26,10 @@ class Cvsync < Formula
     lib.mkpath
     man1.mkpath
 
-    system 'make install'
+    system "make", "install"
+  end
+
+  test do
+    assert_match "#{version}", shell_output("#{bin}/cvsync -h 2>&1", 1)
   end
 end