simple rpath, interpreter tests for existing fixtures.

Library/Homebrew/test/os/linux/pathname_spec.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+require "extend/pathname"
+
+describe Pathname do
+  let(:elf_dir) { described_class.new "#{TEST_FIXTURE_DIR}/elf" }
+  let(:sho) { elf_dir/"libhello.so.0" }
+  let(:exec) { elf_dir/"hello" }
+
+  describe "#interpreter" do
+    it "returns interpreter" do
+      expect(exec.interpreter).to eq "/lib64/ld-linux-x86-64.so.2"
+    end
+  end
+
+  describe "#rpath" do
+    it "returns nil when absent" do
+      expect(exec.rpath).to be_nil
+      expect(sho.rpath).to be_nil
+    end
+  end
+end