Add `PATH` class.

1 files changed, 52 insertions, 0 deletions

diff --git a/Library/Homebrew/test/PATH_spec.rb b/Library/Homebrew/test/PATH_spec.rb
new file mode 100644
index 000000000..d1b1f074d
--- /dev/null
+++ b/Library/Homebrew/test/PATH_spec.rb
@@ -0,0 +1,52 @@
+require "PATH"
+
+describe PATH do
+  describe "#initialize" do
+    it "can take multiple arguments" do
+      expect(described_class.new("/path1", "/path2")).to eq("/path1:/path2")
+    end
+
+    it "can parse a mix of arrays and arguments" do
+      expect(described_class.new(["/path1", "/path2"], "/path3")).to eq("/path1:/path2:/path3")
+    end
+
+    it "splits an existing PATH" do
+      expect(described_class.new("/path1:/path2")).to eq(["/path1", "/path2"])
+    end
+  end
+
+  describe "#to_ary" do
+    it "returns a PATH array" do
+      expect(described_class.new("/path1", "/path2").to_ary).to eq(["/path1", "/path2"])
+    end
+  end
+
+  describe "#to_str" do
+    it "returns a PATH string" do
+      expect(described_class.new("/path1", "/path2").to_str).to eq("/path1:/path2")
+    end
+  end
+
+  describe "#prepend" do
+    it "prepends a path to a PATH" do
+      expect(described_class.new("/path1").prepend("/path2").to_str).to eq("/path2:/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
+  end
+
+  describe "#validate" do
+    it "returns a new PATH without non-existent paths" do
+      allow(File).to receive(:directory?).with("/path1").and_return(true)
+      allow(File).to receive(:directory?).with("/path2").and_return(false)
+
+      path = described_class.new("/path1", "/path2")
+      expect(path.validate.to_ary).to eq(["/path1"])
+      expect(path.to_ary).to eq(["/path1", "/path2"])
+    end
+  end
+end