Rdb: Ruby-Nachbau der MWC /rdb-Werkzeuge

test/test_helper.rb

@@ -0,0 +1,49 @@
+# frozen_string_literal: true
+
+require 'minitest/autorun'
+require 'open3'
+require 'tmpdir'
+require 'fileutils'
+
+ROOT = File.expand_path('..', __dir__)
+BIN = File.join(ROOT, 'bin')
+DEMO = File.join(ROOT, 'demo')
+
+# Each test runs in a scratch copy of demo/, so commands that change files
+# (append, delete, replace ...) never touch the originals.
+class RdbCase < Minitest::Test
+  def setup
+    @dir = Dir.mktmpdir('rdb-test')
+    FileUtils.cp_r(Dir[File.join(DEMO, '*')], @dir)
+  end
+
+  def teardown
+    FileUtils.remove_entry(@dir)
+  end
+
+  # Run a command through its symlink; returns [stdout, stderr, status].
+  def run3(cmd, *args, stdin: '', env: {})
+    Open3.capture3({ 'PATH' => "#{BIN}:#{ENV['PATH']}" }.merge(env), File.join(BIN, cmd), *args,
+                   stdin_data: stdin, chdir: @dir)
+  end
+
+  def rdb(cmd, *args, stdin: nil, file: nil)
+    stdin = File.read(File.join(@dir, file)) if file
+    out, err, st = run3(cmd, *args, stdin: stdin.to_s)
+    assert st.success?, "#{cmd} #{args.join(' ')} failed: #{err}"
+    out
+  end
+
+  # Output as rows of cells, without the head and dash lines.
+  def data(out)
+    out.lines.drop(2).map { |l| l.chomp.split("\t", -1) }
+  end
+
+  def read(name)
+    File.read(File.join(@dir, name))
+  end
+
+  def write(name, text)
+    File.write(File.join(@dir, name), text)
+  end
+end