Make sure duplicates are remove from `PATH`.

1 files changed, 12 insertions, 0 deletions

diff --git a/Library/Homebrew/test/PATH_spec.rb b/Library/Homebrew/test/PATH_spec.rb
index d1b1f074d..7e42670f2 100644
--- a/Library/Homebrew/test/PATH_spec.rb
+++ b/Library/Homebrew/test/PATH_spec.rb
@@ -13,6 +13,10 @@ describe PATH do
     it "splits an existing PATH" do
       expect(described_class.new("/path1:/path2")).to eq(["/path1", "/path2"])
     end
+
+    it "removes duplicates" do
+      expect(described_class.new("/path1", "/path1")).to eq("/path1")
+    end
   end
 
   describe "#to_ary" do
@@ -31,12 +35,20 @@ describe PATH do
     it "prepends a path to a PATH" do
       expect(described_class.new("/path1").prepend("/path2").to_str).to eq("/path2:/path1")
     end
+
+    it "removes duplicates" do
+      expect(described_class.new("/path1").prepend("/path1").to_str).to eq("/path1")
+    end
   end
 
   describe "#append" do
     it "prepends a path to a PATH" do
       expect(described_class.new("/path1").append("/path2").to_str).to eq("/path1:/path2")
     end
+
+    it "removes duplicates" do
+      expect(described_class.new("/path1").append("/path1").to_str).to eq("/path1")
+    end
   end
 
   describe "#validate" do