Add tests for Keg::Relocation

Library/Homebrew/test/keg_relocate_spec.rb

@@ -0,0 +1,53 @@
+# typed: false
+# frozen_string_literal: true
+
+require "keg_relocate"
+
+describe Keg::Relocation do
+  let(:prefix) { "/usr/local" }
+  let(:escaped_prefix) { %r{(?<![a-zA-Z0-9])/usr/local} }
+  let(:cellar) { "#{prefix}/Cellar" }
+  let(:escaped_cellar) { %r{(?<![a-zA-Z0-9])/usr/local/Cellar} }
+  let(:prefix_placeholder) { "@@HOMEBREW_PREFIX@@" }
+  let(:cellar_placeholder) { "@@HOMEBREW_CELLAR@@" }
+
+  specify "#add_replacement_pair" do
+    relocation = described_class.new
+    relocation.add_replacement_pair :prefix, prefix, prefix_placeholder
+    relocation.add_replacement_pair :cellar, /#{cellar}/o, cellar_placeholder
+
+    expect(relocation.replacement_pair_for(:prefix)).to eq [escaped_prefix, prefix_placeholder]
+    expect(relocation.replacement_pair_for(:cellar)).to eq [escaped_cellar, cellar_placeholder]
+  end
+
+  specify "#replace_text" do
+    relocation = described_class.new
+    relocation.add_replacement_pair :prefix, prefix, prefix_placeholder
+    relocation.add_replacement_pair :cellar, /#{cellar}/o, cellar_placeholder
+
+    text = +"foo"
+    relocation.replace_text(text)
+    expect(text).to eq "foo"
+
+    text = +<<~TEXT
+      #{prefix}/foo
+      #{cellar}/foo
+      foo#{prefix}/bar
+      foo#{cellar}/bar
+    TEXT
+    relocation.replace_text(text)
+    expect(text).to eq <<~REPLACED
+      #{prefix_placeholder}/foo
+      #{cellar_placeholder}/foo
+      foo#{prefix}/bar
+      foo#{cellar}/bar
+    REPLACED
+  end
+
+  specify "::path_regex" do
+    expect(described_class.path_regex(prefix)).to eq escaped_prefix
+    expect(described_class.path_regex("foo.bar")).to eq(/(?<![a-zA-Z0-9])foo\.bar/)
+    expect(described_class.path_regex(/#{cellar}/o)).to eq escaped_cellar
+    expect(described_class.path_regex(/foo.bar/)).to eq(/(?<![a-zA-Z0-9])foo.bar/)
+  end
+end