add tests for the Ruby backend

main-server/spec/models/user_spec.rb

@@ -0,0 +1,66 @@
+require "rails_helper"
+
+RSpec.describe User, type: :model do
+  let(:valid_attributes) { { nickname: "player_one", password: "secret123" } }
+
+  describe "validations" do
+    it "is valid with a nickname and password" do
+      expect(User.new(valid_attributes)).to be_valid
+    end
+
+    it "requires a nickname" do
+      user = User.new(valid_attributes.merge(nickname: nil))
+      expect(user).not_to be_valid
+      expect(user.errors[:nickname]).to be_present
+    end
+
+    it "requires a password" do
+      user = User.new(nickname: "player_one", password: nil)
+      expect(user).not_to be_valid
+      expect(user.errors[:password]).to be_present
+    end
+
+    it "rejects nicknames shorter than 3 characters" do
+      expect(User.new(valid_attributes.merge(nickname: "ab"))).not_to be_valid
+    end
+
+    it "rejects nicknames longer than 24 characters" do
+      expect(User.new(valid_attributes.merge(nickname: "a" * 25))).not_to be_valid
+    end
+
+    it "rejects passwords shorter than 6 characters" do
+      expect(User.new(valid_attributes.merge(password: "12345"))).not_to be_valid
+    end
+
+    it "requires nicknames to be unique case-insensitively" do
+      User.create!(valid_attributes)
+      duplicate = User.new(valid_attributes.merge(nickname: "PLAYER_ONE"))
+      expect(duplicate).not_to be_valid
+      expect(duplicate.errors[:nickname]).to be_present
+    end
+  end
+
+  describe "nickname normalization" do
+    it "strips surrounding whitespace" do
+      user = User.create!(valid_attributes.merge(nickname: "  player_one  "))
+      expect(user.nickname).to eq("player_one")
+    end
+  end
+
+  describe "password authentication" do
+    it "authenticates with the correct password" do
+      user = User.create!(valid_attributes)
+      expect(user.authenticate("secret123")).to eq(user)
+    end
+
+    it "rejects a wrong password" do
+      user = User.create!(valid_attributes)
+      expect(user.authenticate("wrong")).to be_falsey
+    end
+
+    it "does not require a password when updating other attributes" do
+      user = User.create!(valid_attributes)
+      expect(user.update(nickname: "new_nickname")).to be true
+    end
+  end
+end