[era_restore] add some cucumber tests

features/era_restore.feature

@@ -0,0 +1,66 @@
+Feature: thin_restore
+  Scenario: print version (-V flag)
+    When I run era_restore with -V
+    Then it should pass with version
+
+  Scenario: print version (--version flag)
+    When I run era_restore with --version
+    Then it should pass with version
+
+  Scenario: print help (-h)
+    When I run era_restore with -h
+    Then it should pass
+    And the output should contain exactly:
+
+    """
+    Usage: era_restore [options]
+    Options:
+      {-h|--help}
+      {-i|--input} <input xml file>
+      {-o|--output} <output device or file>
+      {-V|--version}
+
+    """
+
+  Scenario: print help (--help)
+    When I run era_restore with -h
+    Then it should pass
+    And the output should contain exactly:
+
+    """
+    Usage: era_restore [options]
+    Options:
+      {-h|--help}
+      {-i|--input} <input xml file>
+      {-o|--output} <output device or file>
+      {-V|--version}
+
+    """
+
+  Scenario: missing input file
+    Given the dev file metadata.bin
+    When I run era_restore with -o metadata.bin
+    Then it should fail with:
+    """
+    No input file provided.
+    """
+
+  Scenario: input file not found
+    Given the dev file metadata.bin
+    When I run era_restore with -i foo.xml -o metadata.bin
+    Then it should fail
+
+  Scenario: missing output file
+    When I run era_restore with -i metadata.xml
+    Then it should fail with:
+    """
+    No output file provided.
+    """
+
+  Scenario: successfully restores a valid xml file
+    Given a small era xml file
+    And an empty dev file
+    When I run era_restore with -i metadata.xml -o metadata.bin
+    Then it should pass
+    And the metadata should be valid
+    

features/step_definitions/era_steps.rb

@@ -14,3 +14,18 @@ end
 Then /^era_usage to stderr$/ do
   assert_partial_output(ERA_USAGE, all_stderr)
 end
+
+When(/^I run era_restore with (.*?)$/) do |opts|
+  run_simple("era_restore #{opts}", false)
+end
+
+Given(/^a small era xml file$/) do
+  in_current_dir do
+    system("era_xml create --nr-blocks 100 --nr-writesets 2 --current-era 1000 > #{xml_file}")
+  end
+end
+
+Then(/^the metadata should be valid$/) do
+  run_simple("era_check #{dev_file}", true)
+end
+