Added test for converge_prepend

Author: nickanderson

lib/files.cf

@@ -1104,7 +1104,7 @@ bundle edit_line converge_prepend(marker, lines)
 #
 # ```cf3
 # bundle agent pam_d_su_session
-# # @brief Ensure /etc/pam.d/su has session configured properly
+# #@brief Ensure /etc/pam.d/su has session configured properly
 # {
 #   files:
 #     ubuntu::

tests/acceptance/lib/files/edit_line_converge_prepend.cf

@@ -0,0 +1,48 @@
+body common control
+{
+      inputs => { '../../default.cf.sub' };
+      bundlesequence  => { default("$(this.promise_filename)") };
+      version => "1.0";
+}
+#######################################################
+
+bundle common classes
+{
+  classes:
+
+      "testing_masterfiles_policy_framework"
+        scope => "namespace",
+        comment => "This class is needed so that dcs.cf.sub includes the stdlib instead of using plucked.cf.sub from core which might get out of date and cause us to not test current code from the MPF.";
+}
+
+bundle agent init
+{
+  files:
+      # The tested file "actual" is copied from our seeded starting position.
+      "$(G.testfile)"
+      copy_from => local_cp("$(this.promise_filename).start");
+
+}
+
+#######################################################
+
+bundle agent test
+{
+  meta:
+      "description" -> { "CFE-3483" }
+        string => "Test that converge_prepend works as expected";
+
+  files:
+      "$(G.testfile)"
+        edit_line => converge_prepend( "covfefe", "Despite the constant negative press covfefe" );
+
+}
+
+#######################################################
+
+bundle agent check
+{
+  methods:
+      "Pass/FAIL"
+        usebundle => dcs_check_diff($(G.testfile), "$(this.promise_filename).expected", $(this.promise_filename));
+}

tests/acceptance/lib/files/edit_line_converge_prepend.cf.expected

@@ -0,0 +1,2 @@
+Despite the constant negative press covfefe
+It has nothing to do with the oranges of the investigation, global waming, or hamberders

tests/acceptance/lib/files/edit_line_converge_prepend.cf.start

@@ -0,0 +1,4 @@
+hashtag #covfefe
+What is covfefe?
+It has nothing to do with the oranges of the investigation, global waming, or hamberders
+However, covfefe is bigger than the 2015 paris climate agreement.