test/keg_relocate/grep_spec.rb: add new unit tests

Library/Homebrew/test/keg_relocate/grep_spec.rb

@@ -0,0 +1,58 @@
+# typed: false
+# frozen_string_literal: true
+
+require "keg_relocate"
+
+describe Keg do
+  subject(:keg) { described_class.new(HOMEBREW_CELLAR/"foo/1.0.0") }
+
+  let(:dir) { HOMEBREW_CELLAR/"foo/1.0.0" }
+  let(:text_file) { dir/"file.txt" }
+  let(:binary_file) { dir/"file.bin" }
+
+  before do
+    dir.mkpath
+  end
+
+  def setup_text_file
+    text_file.atomic_write <<~EOS
+      #{dir}/file.txt
+      /foo#{dir}/file.txt
+      foo/bar:#{dir}/file.txt
+      foo/bar:/foo#{dir}/file.txt
+      #{dir}/bar.txt:#{dir}/baz.txt
+    EOS
+  end
+
+  def setup_binary_file
+    binary_file.atomic_write <<~EOS
+      \x00
+    EOS
+  end
+
+  describe "#each_unique_file_matching" do
+    specify "find string matches to path" do
+      setup_text_file
+
+      string_matches = Set.new
+      keg.each_unique_file_matching(dir) do |file|
+        string_matches << file
+      end
+
+      expect(string_matches.size).to eq 1
+    end
+  end
+
+  describe "#each_unique_binary_file" do
+    specify "find null bytes in binaries" do
+      setup_binary_file
+
+      binary_matches = Set.new
+      keg.each_unique_binary_file do |file|
+        binary_matches << file
+      end
+
+      expect(binary_matches.size).to eq 1
+    end
+  end
+end