diff --git a/test/parse/test_entity_declaration.rb b/test/parse/test_entity_declaration.rb
index 9f82eb7e..0df7add7 100644
--- a/test/parse/test_entity_declaration.rb
+++ b/test/parse/test_entity_declaration.rb
@@ -141,6 +141,32 @@ def test_mixed_quote_in_public
  valid-name PUBLIC \"valid-pubid-literal\" \"invalid-system-literal'>]>
               DETAIL
             end
+
+            def test_no_literal_in_system
+              exception = assert_raise(REXML::ParseException) do
+                REXML::Document.new('<!DOCTYPE root [<!ENTITY valid-name SYSTEM>]>')
+              end
+              assert_equal(<<-DETAIL.chomp, exception.to_s)
+Malformed entity declaration
+Line: 1
+Position: 45
+Last 80 unconsumed characters:
+ valid-name SYSTEM>]>
+              DETAIL
+            end
+
+            def test_no_literal_in_public
+              exception = assert_raise(REXML::ParseException) do
+                REXML::Document.new('<!DOCTYPE root [<!ENTITY valid-name PUBLIC "valid-pubid-literal">]>')
+              end
+              assert_equal(<<-DETAIL.chomp, exception.to_s)
+Malformed entity declaration
+Line: 1
+Position: 67
+Last 80 unconsumed characters:
+ valid-name PUBLIC \"valid-pubid-literal\">]>
+              DETAIL
+            end
           end
 
           # https://www.w3.org/TR/2006/REC-xml11-20060816/#NT-PubidLiteral
@@ -185,6 +211,19 @@ def test_mixed_quote
  valid-name PUBLIC \"invalid-pubid-literal' \"valid-system-literal\">]>
               DETAIL
             end
+
+            def test_no_literal
+              exception = assert_raise(REXML::ParseException) do
+                REXML::Document.new('<!DOCTYPE root [<!ENTITY valid-name PUBLIC>]>')
+              end
+              assert_equal(<<-DETAIL.chomp, exception.to_s)
+Malformed entity declaration
+Line: 1
+Position: 45
+Last 80 unconsumed characters:
+ valid-name PUBLIC>]>
+              DETAIL
+            end
           end
         end
 
@@ -350,6 +389,32 @@ def test_mixed_quote_in_public
  % valid-name PUBLIC \"valid-pubid-literal\" 'invalid-system-literal\">]>
               DETAIL
             end
+
+            def test_no_literal_in_system
+              exception = assert_raise(REXML::ParseException) do
+                REXML::Document.new('<!DOCTYPE root [<!ENTITY % valid-name SYSTEM>]>')
+              end
+              assert_equal(<<-DETAIL.chomp, exception.to_s)
+Malformed entity declaration
+Line: 1
+Position: 47
+Last 80 unconsumed characters:
+ % valid-name SYSTEM>]>
+              DETAIL
+            end
+
+            def test_no_literal_in_public
+              exception = assert_raise(REXML::ParseException) do
+                REXML::Document.new('<!DOCTYPE root [<!ENTITY % valid-name PUBLIC "valid-pubid-literal">]>')
+              end
+              assert_equal(<<-DETAIL.chomp, exception.to_s)
+Malformed entity declaration
+Line: 1
+Position: 69
+Last 80 unconsumed characters:
+ % valid-name PUBLIC \"valid-pubid-literal\">]>
+              DETAIL
+            end
           end
 
           # https://www.w3.org/TR/2006/REC-xml11-20060816/#NT-PubidLiteral
@@ -394,6 +459,19 @@ def test_mixed_quote
  % valid-name PUBLIC 'invalid-pubid-literal\" \"valid-system-literal\">]>
               DETAIL
             end
+
+            def test_no_literal
+              exception = assert_raise(REXML::ParseException) do
+                REXML::Document.new('<!DOCTYPE root [<!ENTITY % valid-name PUBLIC>]>')
+              end
+              assert_equal(<<-DETAIL.chomp, exception.to_s)
+Malformed entity declaration
+Line: 1
+Position: 47
+Last 80 unconsumed characters:
+ % valid-name PUBLIC>]>
+              DETAIL
+            end
           end
         end