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+@source
+Feature: custom APT sources to build branches
+  As a Tails developer, when I build Tails, I'd be happy if
+  the proper APT sources were automatically picked depending
+  on which Git branch I am working on.
+
+  Scenario: build from an untagged stable branch
+    Given I am working on the stable branch
+    And last released version mentioned in debian/changelog is 1.0
+    And Tails 1.0 has not been released yet
+    When I run tails-custom-apt-sources
+    Then I should see the 'stable' suite
+    Then I should not see the '1.0' suite
+
+  Scenario: build from a tagged stable branch
+    Given Tails 0.10 has been released
+    And last released version mentioned in debian/changelog is 0.10
+    And I am working on the stable branch
+    When I run tails-custom-apt-sources
+    Then I should see the '0.10' suite
+
+  Scenario: build from a bugfix branch for a stable release
+    Given Tails 0.10 has been released
+    And last released version mentioned in debian/changelog is 0.10
+    And I am working on the bugfix/disable_gdomap branch based on 0.10
+    When I run tails-custom-apt-sources
+    Then I should see the '0.10' suite
+    And I should see the 'bugfix-disable-gdomap' suite
+
+  Scenario: build from an untagged testing branch
+    Given I am working on the testing branch
+    And last released version mentioned in debian/changelog is 0.11
+    And Tails 0.11 has not been released yet
+    When I run tails-custom-apt-sources
+    Then I should see the 'testing' suite
+    And I should not see the '0.11' suite
+
+  Scenario: build from a tagged testing branch
+    Given I am working on the testing branch
+    And last released version mentioned in debian/changelog is 0.11
+    And Tails 0.11 has been released
+    When I run tails-custom-apt-sources
+    Then I should see the '0.11' suite
+    And I should not see the 'testing' suite
+
+  Scenario: build a release candidate from a tagged testing branch
+    Given I am working on the testing branch
+    And Tails 0.11 has been released
+    And last released version mentioned in debian/changelog is 0.12~rc1
+    And Tails 0.12-rc1 has been tagged
+    When I run tails-custom-apt-sources
+    Then I should see the '0.12-rc1' suite
+    And I should not see the 'testing' suite
+
+  Scenario: build from the devel branch
+    Given I am working on the devel branch
+    When I run tails-custom-apt-sources
+    Then I should see the 'devel' suite
+
+  Scenario: build from the experimental branch
+    Given I am working on the experimental branch
+    When I run tails-custom-apt-sources
+    Then I should see the 'experimental' suite
+
+  Scenario: build from a feature branch based on devel
+    Given I am working on the feature/icedove branch based on devel
+    When I run tails-custom-apt-sources
+    Then I should see the 'devel' suite
+    And I should see the 'feature-icedove' suite
+
+  Scenario: build from a feature branch based on devel with dots in its name
+    Given I am working on the feature/live-boot-3.x branch based on devel
+    When I run tails-custom-apt-sources
+    Then I should see the 'devel' suite
+    And I should see the 'feature-live-boot-3.x' suite