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diff --git a/spec/lib/i18n_interpolation_spec.rb b/spec/lib/i18n_interpolation_spec.rb
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+++ b/spec/lib/i18n_interpolation_spec.rb
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+require File.expand_path(File.dirname(__FILE__) + '/../spec_helper')
+
+describe "when using i18n" do
+
+    it "should not complain if we're missing variables from the string" do
+        result = _('Hello', :dip => 'hummus')
+        result.should == 'Hello'
+        result = _('Hello {{dip}}', :dip => 'hummus')
+        result.should == 'Hello hummus'
+    end
+
+    it "should assume that simple translations are always html safe" do
+      _("Hello").should be_html_safe
+    end
+end
+
+describe "n_" do
+    it "should return the translated singular" do
+      FastGettext.should_receive(:n_).with("Apple", "Apples", 1).and_return("Apfel")
+      n_("Apple", "Apples", 1).should == "Apfel"
+    end
+
+    it "should return the translated plural" do
+      FastGettext.should_receive(:n_).with("Apple", "Apples", 3).and_return("Äpfel")
+      n_("Apple", "Apples", 3).should == "Äpfel"
+    end
+
+    it "should return the translated singular interpolated" do
+      FastGettext.should_receive(:n_).with("I eat {{count}} apple", "I eat {{count}} apples", 1).
+        and_return("Ich esse {{count}} Apfel")
+      n_("I eat {{count}} apple", "I eat {{count}} apples", 1, :count => 1).should == "Ich esse 1 Apfel"
+    end
+
+    it "should return the translated plural interpolated" do
+      FastGettext.should_receive(:n_).with("I eat {{count}} apple", "I eat {{count}} apples", 3).
+        and_return("Ich esse {{count}} Äpfel")
+      n_("I eat {{count}} apple", "I eat {{count}} apples", 3, :count => 3).should == "Ich esse 3 Äpfel"
+    end
+
+    it "should always be html safe when there is no interpolation" do
+      FastGettext.should_receive(:n_).with("Apple", "Apples", 1).and_return("Apfel")
+      n_("Apple", "Apples", 1).should be_html_safe
+    end
+end
+
+describe "gettext_interpolate" do
+    context "html unsafe string" do
+        let(:string) { "Hello {{a}}" }
+
+        it "should give an unsafe result" do
+          result = gettext_interpolate(string, :a => "foo")
+          result.should == "Hello foo"
+          result.should_not be_html_safe
+        end
+
+        it "should give an unsafe result" do
+          result = gettext_interpolate(string, :a => "foo".html_safe)
+          result.should == "Hello foo"
+          result.should_not be_html_safe
+        end        
+    end
+
+    context "html safe string" do
+        let(:string) { "Hello {{a}}".html_safe }
+
+        it "should quote the input if it's unsafe" do
+          result = gettext_interpolate(string, :a => "foo&")
+          result.should == "Hello foo&amp;"
+          result.should be_html_safe
+        end
+
+        it "should not quote the input if it's safe" do
+          result = gettext_interpolate(string, :a => "foo&".html_safe)
+          result.should == "Hello foo&"
+          result.should be_html_safe
+        end        
+    end
+end