(MODULES-3590) Fix match_for_absence parameter

Prior to this commit, due to a bug in the exists? method in the
file_line provider, match_for_absence didn't work as described (or
at all really). Update the exists? logic so that match_for_absence
works as described.

Additionally add a unit test to prevent regressions and update the
documentation for the parameter to reflect the fact that it is
ignored when `ensure => present`.

1 files changed, 7 insertions, 0 deletions

diff --git a/spec/unit/puppet/provider/file_line/ruby_spec.rb b/spec/unit/puppet/provider/file_line/ruby_spec.rb
index fdeaf1a..1f41f62 100755
--- a/spec/unit/puppet/provider/file_line/ruby_spec.rb
+++ b/spec/unit/puppet/provider/file_line/ruby_spec.rb
@@ -363,6 +363,13 @@ describe provider_class do
       @provider = provider_class.new(@resource)
     end
 
+    it 'should find a line to match' do
+      File.open(@tmpfile, 'w') do |fh|
+        fh.write("foo1\nfoo\nfoo2")
+      end
+      expect(@provider.exists?).to be_truthy
+    end
+
     it 'should remove one line if it matches' do
       File.open(@tmpfile, 'w') do |fh|
         fh.write("foo1\nfoo\nfoo2")