Implement `file_replace_content' task action

features/actions/file_replace_content.feature

@@ -0,0 +1,31 @@
+@sshd
+Feature: `file_replace_content' task action
+
+  Background:
+    Given a remote file named "some_file" with "some content"
+
+  Scenario: replace a string by another in the requested file
+    Given a recipe with:
+      """
+      target 'some_host.test'
+
+      task :replace_string_in_file do
+        file_replace_content 'some_file', 'content', 'other content'
+      end
+      """
+    When I execute the recipe
+    Then the exit status must be 0
+    And the remote file "some_file" must contain exactly "some other content"
+
+  Scenario: replace a regular expression by a string in the requested file
+    Given a recipe with:
+      """
+      target 'some_host.test'
+
+      task :replace_string_in_file do
+        file_replace_content 'some_file', /\w+\z/, 'other content'
+      end
+      """
+    When I execute the recipe
+    Then the exit status must be 0
+    And the remote file "some_file" must contain exactly "some other content"