Add additional literal evaluator tests

The "undef to nil" test is special because otherwise the value nil when
interpolated in the name of the test results in empty string.

(cherry picked from commit 17ba937)

Author: joshcooper

spec/unit/pops/evaluator/literal_evaluator_spec.rb

@@ -16,8 +16,26 @@
     '"a"'     => 'a',
     'a'       => 'a',
     'a::b'    => 'a::b',
+    'Boolean[true]' => [true],
     'Integer[1]' => [1],
     'Integer[-1]' => [-1],
+    'Integer[-5, -1]' => [-5, -1],
+    'Integer[-5, 5]'  => [-5, 5],
+    # we can't actually represent MIN_INTEGER because it's glexed as
+    # UnaryMinusExpression containing a positive LiteralInteger and the integer
+    # must be <= MAX_INTEGER
+    "Integer[#{Puppet::Pops::MIN_INTEGER + 1}]" => [-0x7FFFFFFFFFFFFFFF],
+    "Integer[0, #{Puppet::Pops::MAX_INTEGER}]"  => [0, 0x7FFFFFFFFFFFFFFF],
+    'Integer[0, default]'         => [0, :default],
+    'Integer[Infinity]'           => ['infinity'],
+    'Float[Infinity]'             => ['infinity'],
+    'Array[Integer, 1]'           => ['integer', 1],
+    'Hash[Integer, String, 1, 3]' => ['integer', 'string', 1, 3],
+    'Regexp[/-1/]'                => [/-1/],
+    'Sensitive[-1]'               => [-1],
+    'Timespan[-5, 5]'             => [-5, 5],
+    'Timestamp["2012-10-10", 1]'  => ['2012-10-10', 1],
+    'Undef' => 'undef',
     'File' => "file",
 
     # special values