1 files changed, 68 insertions, 0 deletions
diff --git a/spec/rubocop/cop/ruby_interpolation_in_translation_spec.rb b/spec/rubocop/cop/ruby_interpolation_in_translation_spec.rb
new file mode 100644
index 00000000000..7bd50866577
--- /dev/null
+++ b/spec/rubocop/cop/ruby_interpolation_in_translation_spec.rb
@@ -0,0 +1,68 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+require 'rubocop'
+require 'rubocop/rspec/support'
+
+require_relative '../../../rubocop/cop/ruby_interpolation_in_translation'
+
+# Disabling interpolation check as we deliberately want to have #{} in strings.
+# rubocop:disable Lint/InterpolationCheck
+describe RuboCop::Cop::RubyInterpolationInTranslation do
+  subject(:cop) { described_class.new }
+
+  it 'does not add an offence for a regular messages' do
+    inspect_source('_("Hello world")')
+
+    expect(cop.offenses).to be_empty
+  end
+
+  it 'adds the correct offence when using interpolation in a string' do
+    inspect_source('_("Hello #{world}")')
+
+    offense = cop.offenses.first
+
+    expect(offense.location.source).to eq('#{world}')
+    expect(offense.message).to eq('Don\'t use ruby interpolation #{} inside translated strings, instead use %{}')
+  end
+
+  it 'detects when using a ruby interpolation in the first argument of a pluralized string' do
+    inspect_source('n_("Hello #{world}", "Hello world")')
+
+    expect(cop.offenses).not_to be_empty
+  end
+
+  it 'detects when using a ruby interpolation in the second argument of a pluralized string' do
+    inspect_source('n_("Hello world", "Hello #{world}")')
+
+    expect(cop.offenses).not_to be_empty
+  end
+
+  it 'detects when using interpolation in a namespaced translation' do
+    inspect_source('s_("Hello|#{world}")')
+
+    expect(cop.offenses).not_to be_empty
+  end
+
+  it 'does not add an offence for messages defined over multiple lines' do
+    source = <<~SRC
+      _("Hello "\
+        "world ")
+    SRC
+
+    inspect_source(source)
+    expect(cop.offenses).to be_empty
+  end
+
+  it 'adds an offence for violations in a message defined over multiple lines' do
+    source = <<~SRC
+      _("Hello "\
+        "\#{world} ")
+    SRC
+
+    inspect_source(source)
+    expect(cop.offenses).not_to be_empty
+  end
+end
+# rubocop:enable Lint/InterpolationCheck