Import spec examples from ruby/syntax_suggest

Merged: https://github.com/ruby/ruby/pull/6287

spec/syntax_suggest/integration/exe_cli_spec.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+require_relative "../spec_helper"
+
+module SyntaxSuggest
+  RSpec.describe "exe" do
+    def exe_path
+      root_dir.join("exe").join("syntax_suggest")
+    end
+
+    def exe(cmd)
+      out = run!("#{exe_path} #{cmd}", raise_on_nonzero_exit: false)
+      puts out if ENV["SYNTAX_SUGGEST_DEBUG"]
+      out
+    end
+
+    it "prints the version" do
+      out = exe("-v")
+      expect(out.strip).to include(SyntaxSuggest::VERSION)
+    end
+  end
+end