Handle case sensitive values when creating securities

test/models/security_test.rb

@@ -0,0 +1,41 @@
+require "test_helper"
+
+class SecurityTest < ActiveSupport::TestCase
+  # Below has 3 example scenarios:
+  # 1. Original ticker
+  # 2. Duplicate ticker on a different exchange (different market price)
+  # 3. "Offline" version of the same ticker (for users not connected to a provider)
+  test "can have duplicate tickers if exchange is different" do
+    original = Security.create!(ticker: "TEST", exchange_operating_mic: "XNAS")
+    duplicate = Security.create!(ticker: "TEST", exchange_operating_mic: "CBOE")
+    offline = Security.create!(ticker: "TEST", exchange_operating_mic: nil)
+
+    assert original.valid?
+    assert duplicate.valid?
+    assert offline.valid?
+  end
+
+  test "cannot have duplicate tickers if exchange is the same" do
+    original = Security.create!(ticker: "TEST", exchange_operating_mic: "XNAS")
+    duplicate = Security.new(ticker: "TEST", exchange_operating_mic: "XNAS")
+
+    assert_not duplicate.valid?
+    assert_equal [ "has already been taken" ], duplicate.errors[:ticker]
+  end
+
+  test "cannot have duplicate tickers if exchange is nil" do
+    original = Security.create!(ticker: "TEST", exchange_operating_mic: nil)
+    duplicate = Security.new(ticker: "TEST", exchange_operating_mic: nil)
+
+    assert_not duplicate.valid?
+    assert_equal [ "has already been taken" ], duplicate.errors[:ticker]
+  end
+
+  test "casing is ignored when checking for duplicates" do
+    original = Security.create!(ticker: "TEST", exchange_operating_mic: "XNAS")
+    duplicate = Security.new(ticker: "tEst", exchange_operating_mic: "xNaS")
+
+    assert_not duplicate.valid?
+    assert_equal [ "has already been taken" ], duplicate.errors[:ticker]
+  end
+end