Add simple test.

test/chart_helpers_test.rb

@@ -0,0 +1,51 @@
+require 'test_helper'
+
+require 'chartjs/chart_helpers'
+
+class ChartHelpersTest < Minitest::Test
+
+  class Foo
+    include Chartjs::ChartHelpers
+
+    def to_js(element)
+      to_javascript_string element
+    end
+  end
+
+  def setup
+    @subject = Foo.new
+  end
+
+  def test_to_javascript_string
+    assert_equal '"foo"', @subject.to_js('foo')
+
+    assert_equal '["a",42]', @subject.to_js(['a', 42])
+
+    assert_equal '{"a":42}', @subject.to_js({'a' => 42})
+
+    assert_equal '{"a":function(x) { blah; }}', @subject.to_js({'a' => 'function(x) { blah; }'})
+
+    expected = \
+'{"a":function(x) {
+  if (x) {
+    foo();
+  }
+  else {
+    bar();
+  }
+}
+}'
+
+    assert_equal expected, @subject.to_js({'a' => <<END})
+function(x) {
+  if (x) {
+    foo();
+  }
+  else {
+    bar();
+  }
+}
+END
+  end
+
+end

test/test_helper.rb

@@ -0,0 +1,3 @@
+$LOAD_PATH.unshift File.expand_path('../../lib', __FILE__)
+
+require 'minitest/autorun'