chipmunk 7.0.0, add test

Closes Homebrew/homebrew#38836.

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

Formula/chipmunk.rb

@@ -1,17 +1,35 @@
-require 'formula'
-
 class Chipmunk < Formula
-  homepage 'http://chipmunk-physics.net/'
-  url 'https://chipmunk-physics.net/release/Chipmunk-6.x/Chipmunk-6.2.1.tgz'
-  sha1 '593a15a9032586e56b16d22d84f4f04c1f11a44e'
+  homepage "http://chipmunk-physics.net/"
+  url "http://chipmunk-physics.net/release/Chipmunk-7.x/Chipmunk-7.0.0.tgz"
+  sha256 "14ab380396a96b15951c42a2d7ca259a53ecab4e550a71857d13dcfd388a51cd"
 
-  depends_on 'cmake' => :build
+  head "https://github.com/slembcke/Chipmunk2D.git"
+
+  depends_on "cmake" => :build
 
   def install
-    system "cmake", "-DCMAKE_INSTALL_PREFIX=#{prefix}",
-                    "-DCMAKE_BUILD_TYPE=Release",
-                    "-DBUILD_DEMOS=OFF",
-                    "."
-    system "make install"
+    system "cmake", ".", "-DBUILD_DEMOS=OFF", *std_cmake_args
+    system "make", "install"
+
+    doc.install Dir["doc/*"]
+  end
+
+  test do
+    (testpath/"test.c").write <<-EOS.undent
+      #include <stdio.h>
+      #include <chipmunk.h>
+
+      int main(void){
+        cpVect gravity = cpv(0, -100);
+        cpSpace *space = cpSpaceNew();
+        cpSpaceSetGravity(space, gravity);
+
+        cpSpaceFree(space);
+        return 0;
+      }
+    EOS
+    system ENV.cc, "-I#{include}/chipmunk", "-L#{lib}", "-lchipmunk",
+           testpath/"test.c", "-o", testpath/"test"
+    system "./test"
   end
 end