Replace assert with assert_equal in some test cases

[#4654 state:resolved]
Signed-off-by: NJosé Valim <jose.valim@gmail.com>

activerecord/test/cases/validations_test.rb

@@ -65,7 +65,7 @@ def test_error_on_update
   def test_error_on_given_context
     r = WrongReply.new
     assert !r.valid?(:special_case)
-    assert "Invalid", r.errors[:title].join
+    assert_equal "Invalid", r.errors[:title].join
 
     r.title = "secret"
     r.content = "Good"
@@ -73,7 +73,7 @@ def test_error_on_given_context
 
     r.title = nil
     assert !r.save(:context => :special_case)
-    assert "Invalid", r.errors[:title].join
+    assert_equal "Invalid", r.errors[:title].join
 
     r.title = "secret"
     assert r.save(:context => :special_case)

activeresource/test/cases/base_test.rb

@@ -1017,7 +1017,7 @@ def test_to_xml
     encode = matz.encode
     xml = matz.to_xml
 
-    assert encode, xml
+    assert_equal encode, xml
     assert xml.include?('<?xml version="1.0" encoding="UTF-8"?>')
     assert xml.include?('<name>Matz</name>')
     assert xml.include?('<id type="integer">1</id>')
@@ -1030,7 +1030,7 @@ def test_to_xml_with_element_name
     encode = matz.encode
     xml = matz.to_xml
 
-    assert encode, xml
+    assert_equal encode, xml
     assert xml.include?('<?xml version="1.0" encoding="UTF-8"?>')
     assert xml.include?('<ruby-creator>')
     assert xml.include?('<name>Matz</name>')
@@ -1065,7 +1065,7 @@ def test_to_json_with_element_name
     json = joe.to_json
     Person.format = :xml
 
-    assert encode, json
+    assert_equal encode, json
     assert_match %r{^\{"ruby_creator":\{"person":\{}, json
     assert_match %r{"id":6}, json
     assert_match %r{"name":"Joe"}, json