diff --git a/activerecord/test/cases/relations_test.rb b/activerecord/test/cases/relations_test.rb
index 0a0ebf77e8f..4f7a7105bcb 100644
--- a/activerecord/test/cases/relations_test.rb
+++ b/activerecord/test/cases/relations_test.rb
@@ -1307,6 +1307,18 @@ class RelationTest < ActiveRecord::TestCase
     green_birds.each { |bird| assert_predicate bird, :persisted? }
   end
 
+  def test_create_with_block
+    sparrow = Bird.create do |bird|
+      bird.name = "sparrow"
+      bird.color = "grey"
+    end
+
+    assert_kind_of Bird, sparrow
+    assert_predicate sparrow, :persisted?
+    assert_equal "sparrow", sparrow.name
+    assert_equal "grey", sparrow.color
+  end
+
   def test_create_bang_with_array
     green_birds = Bird.where(color: "green").create!([{ name: "parrot" }, { name: "canary" }])
     assert_equal ["parrot", "canary"], green_birds.map(&:name)
@@ -1481,6 +1493,19 @@ class RelationTest < ActiveRecord::TestCase
     assert_equal bird, Bird.create_with(color: "blue").find_or_create_by(name: "bob")
   end
 
+  def test_find_or_create_by_with_block
+    assert_nil Bird.find_by(name: "bob")
+
+    bird = Bird.find_or_create_by(name: "bob") do |record|
+      record.color = "blue"
+    end
+    assert_predicate bird, :persisted?
+    assert_equal bird.name, "bob"
+    assert_equal bird.color, "blue"
+
+    assert_equal bird, Bird.find_or_create_by(name: "bob", color: "blue")
+  end
+
   def test_find_or_create_by!
     assert_raises(ActiveRecord::RecordInvalid) { Bird.find_or_create_by!(color: "green") }
   end
@@ -1494,6 +1519,20 @@ class RelationTest < ActiveRecord::TestCase
     assert_not_equal subscriber, Subscriber.create_or_find_by(nick: "cat")
   end
 
+  def test_create_or_find_by_with_block
+    assert_nil Subscriber.find_by(nick: "bob")
+
+    subscriber = Subscriber.create_or_find_by(nick: "bob") do |record|
+      record.name = "the builder"
+    end
+
+    assert_equal "bob", subscriber.nick
+    assert_equal "the builder", subscriber.name
+    assert_predicate subscriber, :persisted?
+    assert_equal subscriber, Subscriber.create_or_find_by(nick: "bob")
+    assert_not_equal subscriber, Subscriber.create_or_find_by(nick: "cat")
+  end
+
   def test_create_or_find_by_should_not_raise_due_to_validation_errors
     assert_nothing_raised do
       bird = Bird.create_or_find_by(color: "green")
@@ -1562,6 +1601,20 @@ class RelationTest < ActiveRecord::TestCase
     assert_equal bird, Bird.find_or_initialize_by(name: "bob")
   end
 
+  def test_find_or_initialize_by_with_block
+    assert_nil Bird.find_by(name: "bob")
+
+    bird = Bird.find_or_initialize_by(name: "bob") do |record|
+      record.color = "blue"
+    end
+    assert_predicate bird, :new_record?
+    assert_equal bird.name, "bob"
+    assert_equal bird.color, "blue"
+    bird.save!
+
+    assert_equal bird, Bird.find_or_initialize_by(name: "bob", color: "blue")
+  end
+
   def test_explicit_create_with
     hens = Bird.where(name: "hen")
     assert_equal "hen", hens.new.name