add test for code quality

test/test_quality.rb

@@ -0,0 +1,56 @@
+#!/usr/bin/env ruby -w
+libdir = File.expand_path('../../lib', __FILE__)
+$LOAD_PATH.unshift(libdir) unless $LOAD_PATH.include?(libdir)
+
+require "test/unit"
+
+class TestQuality < Test::Unit::TestCase
+  def test_can_still_be_built
+    Dir.chdir(root) do
+      `gem build rets4r.gemspec`
+      assert_equal 0, $?
+    end
+  end
+
+  def test_has_no_malformed_whitespace
+    error_messages = []
+    Dir.chdir(root) do
+      File.read("MANIFEST").split("\n").each do |filename|
+        error_messages << check_for_tab_characters(filename)
+        error_messages << check_for_extra_spaces(filename)
+      end
+    end
+    assert_well_formed error_messages.compact
+  end
+
+  def assert_well_formed(actual)
+    assert actual.empty?, actual.join("\n")
+  end
+
+  def check_for_tab_characters(filename)
+    failing_lines = []
+    File.readlines(filename).each_with_index do |line,number|
+      failing_lines << number + 1 if line =~ /\t/
+    end
+
+    unless failing_lines.empty?
+      "#{filename} has tab characters on lines #{failing_lines.join(', ')}"
+    end
+  end
+
+  def check_for_extra_spaces(filename)
+    failing_lines = []
+    File.readlines(filename).each_with_index do |line,number|
+      next if line =~ /^\s+#.*\s+\n$/
+      failing_lines << number + 1 if line =~ /\s+\n$/
+    end
+
+    unless failing_lines.empty?
+      "#{filename} has spaces on the EOL on lines #{failing_lines.join(', ')}"
+    end
+  end
+
+  def root
+    File.expand_path("../..", __FILE__)
+  end
+end