1 files changed, 52 insertions, 0 deletions
diff --git a/activemodel/test/cases/conversion_test.rb b/activemodel/test/cases/conversion_test.rb
new file mode 100644
index 0000000000..347896ed50
--- /dev/null
+++ b/activemodel/test/cases/conversion_test.rb
@@ -0,0 +1,52 @@
+# frozen_string_literal: true
+
+require "cases/helper"
+require "models/contact"
+require "models/helicopter"
+
+class ConversionTest < ActiveModel::TestCase
+  test "to_model default implementation returns self" do
+    contact = Contact.new
+    assert_equal contact, contact.to_model
+  end
+
+  test "to_key default implementation returns nil for new records" do
+    assert_nil Contact.new.to_key
+  end
+
+  test "to_key default implementation returns the id in an array for persisted records" do
+    assert_equal [1], Contact.new(id: 1).to_key
+  end
+
+  test "to_param default implementation returns nil for new records" do
+    assert_nil Contact.new.to_param
+  end
+
+  test "to_param default implementation returns a string of ids for persisted records" do
+    assert_equal "1", Contact.new(id: 1).to_param
+  end
+
+  test "to_param returns the string joined by '-'" do
+    assert_equal "abc-xyz", Contact.new(id: ["abc", "xyz"]).to_param
+  end
+
+  test "to_param returns nil if to_key is nil" do
+    klass = Class.new(Contact) do
+      def persisted?
+        true
+      end
+    end
+
+    assert_nil klass.new.to_param
+  end
+
+  test "to_partial_path default implementation returns a string giving a relative path" do
+    assert_equal "contacts/contact", Contact.new.to_partial_path
+    assert_equal "helicopters/helicopter", Helicopter.new.to_partial_path,
+      "ActiveModel::Conversion#to_partial_path caching should be class-specific"
+  end
+
+  test "to_partial_path handles namespaced models" do
+    assert_equal "helicopter/comanches/comanche", Helicopter::Comanche.new.to_partial_path
+  end
+end