Add feature for string tests

features/string.feature

+Feature: String replacement
+  As a scholar who likes to blog
+  I want to publish my BibTeX bibliography on my blog
+  And make sure that strings are correctly substituted
+
+  @tags @string
+  Scenario: String replacement
+    Given I have a scholar configuration with:
+      | key    | value             |
+      | source | ./_bibliography   |
+    And I have a "_bibliography" directory
+    And I have a file "_bibliography/references.bib":
+      """
+      @string{ rubypl = "The Ruby Programming Language" }
+      @book{ruby,
+        title     = rubypl,
+        author    = {Flanagan, David and Matsumoto, Yukihiro},
+        year      = {2008},
+        publisher = {O'Reilly Media}
+      }
+      """
+    And I have a page "scholar.html":
+      """
+      ---
+      ---
+      {% bibliography -f references %}
+      """
+    When I run jekyll
+    Then the _site directory should exist
+    And the "_site/scholar.html" file should exist
+    And I should see "<i>The Ruby Programming Language</i>" in "_site/scholar.html"
+
+  @tags @string
+  Scenario: String replacement disabled
+    Given I have a scholar configuration with:
+      | key             | value             |
+      | source          | ./_bibliography   |
+      | replace_strings | false             |
+    And I have a "_bibliography" directory
+    And I have a file "_bibliography/references.bib":
+      """
+      @string{ rubypl = "The Ruby Programming Language" }
+      @book{ruby,
+        title     = rubypl,
+        author    = {Flanagan, David and Matsumoto, Yukihiro},
+        year      = {2008},
+        publisher = {O'Reilly Media}
+      }
+      """
+    And I have a page "scholar.html":
+      """
+      ---
+      ---
+      {% bibliography -f references %}
+      """
+    When I run jekyll
+    Then the _site directory should exist
+    And the "_site/scholar.html" file should exist
+    And I should see "<i>rubypl</i>" in "_site/scholar.html"
+
+  @tags @string
+  Scenario: Join strings
+    Given I have a scholar configuration with:
+      | key    | value             |
+      | source | ./_bibliography   |
+    And I have a "_bibliography" directory
+    And I have a file "_bibliography/references.bib":
+      """
+      @string{ ruby = "Ruby" }
+      @book{ruby,
+        title     = "The " # ruby # " Programming Language",
+        author    = {Flanagan, David and Matsumoto, Yukihiro},
+        year      = {2008},
+        publisher = {O'Reilly Media}
+      }
+      """
+    And I have a page "scholar.html":
+      """
+      ---
+      ---
+      {% bibliography -f references %}
+      """
+    When I run jekyll
+    Then the _site directory should exist
+    And the "_site/scholar.html" file should exist
+    And I should see "<i>The Ruby Programming Language</i>" in "_site/scholar.html"
+
+  @tags @string
+  Scenario: Join strings disabled
+    Given I have a scholar configuration with:
+      | key          | value             |
+      | source       | ./_bibliography   |
+      | join_strings | false             |
+    And I have a "_bibliography" directory
+    And I have a file "_bibliography/references.bib":
+      """
+      @string{ ruby = "Ruby" }
+      @book{ruby,
+        title     = "The " # ruby # " Programming Language",
+        author    = {Flanagan, David and Matsumoto, Yukihiro},
+        year      = {2008},
+        publisher = {O'Reilly Media}
+      }
+      """
+    And I have a page "scholar.html":
+      """
+      ---
+      ---
+      {% bibliography -f references %}
+      """
+    When I run jekyll
+    Then the _site directory should exist
+    And the "_site/scholar.html" file should exist
+    And I should see "<i>\"The \" # \"Ruby\" # \" Programming Language\"</i>" in "_site/scholar.html"