add tests

test/unit/packwerk/references_from_file_test.rb

@@ -0,0 +1,47 @@
+# typed: true
+# frozen_string_literal: true
+
+require "test_helper"
+
+module Packwerk
+  class ReferencesFromFileTest < Minitest::Test
+    setup do
+      config = Configuration.new
+      config.stubs(:load_paths).returns({})
+      @run_context = RunContext.from_configuration(config)
+      RunContext.stubs(:from_configuration).with(config).returns(@run_context)
+      @referencer = ReferencesFromFile.new(config)
+    end
+
+    test "raises on parser error" do
+      offense = Offense.new(file: "something.rb", message: "yo")
+      @run_context.stubs(:references_from_file).returns(
+        RunContext::FileReferencesResult.new(file_offenses: [offense], references: [])
+      )
+
+      assert_raises ReferencesFromFile::FileParserError do
+        @referencer.list("lib/something.rb")
+      end
+    end
+
+    test "fetches violations for all files from run context" do
+      references = {
+        "lib/something.rb" => [
+          Reference.new
+        ],
+        "components/ice_cream_sales/app/models/scoop.rb" => [
+          Reference.new
+        ]
+      }
+      @referencer.stubs(:files).returns(references.keys)
+
+      references.each do |file, references|
+        @run_context.stubs(:references_from_file).with(relative_file: file).returns(
+          RunContext::FileReferencesResult.new(file_offenses: [], references: references)
+        )
+      end
+
+      assert_equal Set.new(references.values.flatten), Set.new(@referencer.list_all)
+    end
+  end
+end