bdd: Add some more back/forward tests.

tests/integration/features/backforward.feature

@@ -4,6 +4,7 @@ Feature: Going back and forward.
     Scenario: Going back/forward
         Given I open data/backforward/1.txt
         When I open data/backforward/2.txt
+        And I run :tab-only
         And I run :back
         And I wait until data/backforward/1.txt is loaded
         And I reload
@@ -15,13 +16,81 @@ Feature: Going back and forward.
             data/backforward/2.txt
             data/backforward/1.txt
             data/backforward/2.txt
+        And the session should look like:
+            windows:
+            - tabs:
+              - history:
+                - url: http://localhost:*/data/backforward/1.txt
+                - active: true
+                  url: http://localhost:*/data/backforward/2.txt
 
-   Scenario: Going back without history
-       Given I open data/backforward/1.txt
-       When I run :back
-       Then the error "At beginning of history." should be shown.
+    Scenario: Going back in a new tab
+        Given I open data/backforward/1.txt
+        When I open data/backforward/2.txt
+        And I run :tab-only
+        And I run :back -t
+        And I wait until data/backforward/1.txt is loaded
+        Then the session should look like:
+            windows:
+            - tabs:
+              - history:
+                - url: http://localhost:*/data/backforward/1.txt
+                - active: true
+                  url: http://localhost:*/data/backforward/2.txt
+              - active: true
+                history:
+                - active: true
+                  url: http://localhost:*/data/backforward/1.txt
+                - url: http://localhost:*/data/backforward/2.txt
 
-   Scenario: Going forward without history
-       Given I open data/backforward/1.txt
-       When I run :forward
-       Then the error "At end of history." should be shown.
+    Scenario: Going back in a new background tab
+        Given I open data/backforward/1.txt
+        When I open data/backforward/2.txt
+        And I run :tab-only
+        And I run :back -b
+        And I wait until data/backforward/1.txt is loaded
+        Then the session should look like:
+            windows:
+            - tabs:
+              - active: true
+                history:
+                - url: http://localhost:*/data/backforward/1.txt
+                - active: true
+                  url: http://localhost:*/data/backforward/2.txt
+              - history:
+                - active: true
+                  url: http://localhost:*/data/backforward/1.txt
+                - url: http://localhost:*/data/backforward/2.txt
+
+    Scenario: Going back in a new window
+        Given I have a fresh instance
+        When I open data/backforward/1.txt
+        And I open data/backforward/2.txt
+        And I run :back -w
+        And I wait until data/backforward/1.txt is loaded
+        Then the session should look like:
+            windows:
+            - tabs:
+              - active: true
+                history:
+                - url: about:blank
+                - url: http://localhost:*/data/backforward/1.txt
+                - active: true
+                  url: http://localhost:*/data/backforward/2.txt
+            - tabs:
+              - active: true
+                history:
+                - url: about:blank
+                - active: true
+                  url: http://localhost:*/data/backforward/1.txt
+                - url: http://localhost:*/data/backforward/2.txt
+
+    Scenario: Going back without history
+        Given I open data/backforward/1.txt
+        When I run :back
+        Then the error "At beginning of history." should be shown.
+
+    Scenario: Going forward without history
+        Given I open data/backforward/1.txt
+        When I run :forward
+        Then the error "At end of history." should be shown.