Adding default message for uri? predicate (#477)

* Adding default message for uri? predicate

* Rubocop fixes

config/errors.yml

@@ -107,5 +107,7 @@ en:
 
       uuid_v4?: "is not a valid UUID"
 
+      uri?: "is not a valid URI"
+
       not:
         empty?: "cannot be empty"

spec/integration/params/predicates/uri_spec.rb

@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+RSpec.describe "Predicates: uri?" do
+  subject(:schema) do
+    Dry::Schema.Params do
+      required(:uri) { str? & uri?(:https) }
+    end
+  end
+
+  it "passes with valid input" do
+    expect(schema.(uri: "https://www.example.com")).to be_success
+  end
+
+  it "fails with invalid input" do
+    expect(schema.(uri: "not-a-uri").errors.to_h).to eql(uri: ["is not a valid URI"])
+  end
+end