uninstall: fix dependent order bug

Library/Homebrew/cmd/uninstall.rb

@@ -16,7 +16,7 @@ def uninstall
 
     if !ARGV.force?
       ARGV.kegs.each do |keg|
-        dependents = keg.installed_dependents
+        dependents = keg.installed_dependents - ARGV.kegs
         if dependents.any?
           dependents_output = dependents.map { |k| "#{k.name} #{k.version}" }.join(", ")
           conjugation = dependents.count == 1 ? "is" : "are"

Library/Homebrew/test/test_uninstall.rb

@@ -1,8 +1,43 @@
 require "helper/integration_command_test_case"
 
 class IntegrationCommandTestUninstall < IntegrationCommandTestCase
+  def setup
+    super
+    @f1_path = setup_test_formula "testball_f1", <<-CONTENT
+      def install
+        FileUtils.touch prefix/touch("hello")
+      end
+    CONTENT
+    @f2_path = setup_test_formula "testball_f2", <<-CONTENT
+      depends_on "testball_f1"
+
+      def install
+        FileUtils.touch prefix/touch("hello")
+      end
+    CONTENT
+  end
+
   def test_uninstall
     cmd("install", testball)
     assert_match "Uninstalling testball", cmd("uninstall", "--force", testball)
   end
+
+  def test_uninstall_leaving_dependents
+    cmd("install", "testball_f2")
+    assert_match "Refusing to uninstall", cmd_fail("uninstall", "testball_f1")
+    assert_match "Uninstalling #{Formulary.factory(@f2_path).rack}",
+      cmd("uninstall", "testball_f2")
+  end
+
+  def test_uninstall_dependent_first
+    cmd("install", "testball_f2")
+    assert_match "Uninstalling #{Formulary.factory(@f1_path).rack}",
+      cmd("uninstall", "testball_f2", "testball_f1")
+  end
+
+  def test_uninstall_dependent_last
+    cmd("install", "testball_f2")
+    assert_match "Uninstalling #{Formulary.factory(@f2_path).rack}",
+      cmd("uninstall", "testball_f1", "testball_f2")
+  end
 end