Support (key, value) form in env? condition keyword

features/tests/env.feature

@@ -21,7 +21,35 @@ Feature: `env?' condition keyword
       target 'some_host.test'
 
       task :testing_env_var_definition do
-        condition { env? :inexistent_var }
+        condition { env? :non_existent_var }
+
+        echo 'evaluated'
+      end
+      """
+    When I successfully execute the recipe
+    Then the output must not contain "evaluated"
+
+  Scenario: succeeds when remote environment variable value match
+    Given a recipe with:
+      """
+      target 'some_host.test'
+
+      task :testing_env_var_value do
+        condition { env? :shell, '/bin/sh' }
+
+        echo 'evaluated'
+      end
+      """
+    When I successfully execute the recipe
+    Then the output must contain "evaluated"
+
+  Scenario: fails when remote environment variable value does not match
+    Given a recipe with:
+      """
+      target 'some_host.test'
+
+      task :testing_env_var_value do
+        condition { env? :shell, 'non_existent_shell' }
 
         echo 'evaluated'
       end