Add missing test fixture.

test/fixtures/stylesheets/envtest/config.rb

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+# Require any additional compass plugins here.
+project_type = :stand_alone
+css_dir = "tmp"
+sass_dir = "sass"
+images_dir = "images"
+output_style = :nested
+line_comments = false
+
+disable_warnings = true

test/fixtures/stylesheets/envtest/css/env.css

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+.env {
+  env: <%= options[:environment] %>; }

test/fixtures/stylesheets/envtest/sass/env.scss

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+.env {
+  env: compass-env();  
+}