beast: import from homebrew/science

Closes #18440.

Signed-off-by: ilovezfs <ilovezfs@icloud.com>

Formula/beast.rb

@@ -0,0 +1,32 @@
+class Beast < Formula
+  desc "Bayesian Evolutionary Analysis Sampling Trees"
+  homepage "http://beast.bio.ed.ac.uk/"
+  url "https://github.com/beast-dev/beast-mcmc/archive/v1.8.4.tar.gz"
+  sha256 "de8e7dd82eb9017b3028f3b06fd588e5ace57c2b7466ba2e585f9bd8381407af"
+  head "https://github.com/beast-dev/beast-mcmc.git"
+
+  depends_on :ant => :build
+  depends_on :java => "1.7+"
+
+  def install
+    system "ant", "linux"
+    libexec.install Dir["release/Linux/BEASTv*/*"]
+    pkgshare.install_symlink libexec/"examples"
+    bin.install_symlink Dir[libexec/"bin/*"]
+  end
+
+  test do
+    cp pkgshare/"examples/clockModels/testUCRelaxedClockLogNormal.xml", testpath
+
+    # Run fewer generations to speed up tests
+    inreplace "testUCRelaxedClockLogNormal.xml", 'chainLength="10000000"',
+                                                 'chainLength="100000"'
+
+    system "#{bin}/beast", "-beagle_off", "testUCRelaxedClockLogNormal.xml"
+
+    %w[ops log trees].each do |ext|
+      output = "testUCRelaxedClockLogNormal." + ext
+      assert_predicate testpath/output, :exist?, "Failed to create #{output}"
+    end
+  end
+end