1 files changed, 40 insertions, 0 deletions
diff --git a/activesupport/test/core_ext/string_ext_test.rb b/activesupport/test/core_ext/string_ext_test.rb
index 072b970a2d..95df173880 100644
--- a/activesupport/test/core_ext/string_ext_test.rb
+++ b/activesupport/test/core_ext/string_ext_test.rb
@@ -58,6 +58,11 @@ class StringInflectionsTest < ActiveSupport::TestCase
     assert_equal("blargles", "blargle".pluralize(2))
   end
 
+  test 'pluralize with count = 1 still returns new string' do
+    name = "Kuldeep"
+    assert_not_same name.pluralize(1), name
+  end
+
   def test_singularize
     SingularToPlural.each do |singular, plural|
       assert_equal(singular, plural.singularize)
@@ -296,6 +301,12 @@ class StringAccessTest < ActiveSupport::TestCase
     assert_equal 'x', 'x'.first(4)
   end
 
+  test "#first with Fixnum >= string length still returns a new string" do
+    string = "hello"
+    different_string = string.first(5)
+    assert_not_same different_string, string
+  end
+
   test "#last returns the last character" do
     assert_equal "o", "hello".last
     assert_equal 'x', 'x'.last
@@ -308,6 +319,12 @@ class StringAccessTest < ActiveSupport::TestCase
     assert_equal 'x', 'x'.last(4)
   end
 
+  test "#last with Fixnum >= string length still returns a new string" do
+    string = "hello"
+    different_string = string.last(5)
+    assert_not_same different_string, string
+  end
+
   test "access returns a real string" do
     hash = {}
     hash["h"] = true
@@ -608,6 +625,29 @@ class OutputSafetyTest < ActiveSupport::TestCase
     assert !@other_combination.html_safe?
   end
 
+  test "Prepending safe onto unsafe yields unsafe" do
+    @string.prepend "other".html_safe
+    assert !@string.html_safe?
+    assert_equal @string, "otherhello"
+  end
+
+  test "Prepending unsafe onto safe yields escaped safe" do
+    other = "other".html_safe
+    other.prepend "<foo>"
+    assert other.html_safe?
+    assert_equal other, "&lt;foo&gt;other"
+  end
+
+  test "Deprecated #prepend! method is still present" do
+    other = "other".html_safe
+
+    assert_deprecated do
+      other.prepend! "<foo>"
+    end
+
+    assert_equal other, "&lt;foo&gt;other"
+  end
+
   test "Concatting safe onto unsafe yields unsafe" do
     @other_string = "other"