Consider eager loaded code too when detecting dead methods

lib/coverband/utils/dead_methods.rb

@@ -37,7 +37,11 @@ def self.scan(file_path:, coverage:)
       end
 
       def self.scan_all
-        coverage = Coverband.configuration.store.coverage
+        # If the file was loaded during eager loading and then its code is never executed
+        # during runtime, then it will not have any runtime coverage. When reporting
+        # dead methods, we need to look at all the files discovered during the eager loading
+        # and runtime phases.
+        coverage = Coverband.configuration.store.get_coverage_report[Coverband::MERGED_TYPE]
         coverage.flat_map do |file_path, coverage|
           scan(file_path: file_path, coverage: coverage["data"])
         end

test/coverband/utils/dead_methods_test.rb

@@ -36,6 +36,18 @@ def test_all_dead_methods
           assert_equal(6, dead_method.last_line_number)
         end
 
+        def test_all_dead_methods_on_runtime
+          @coverband.eager_loading!
+          require_unique_file
+          @coverband.report_coverage
+          @coverband.runtime!
+          dead_methods = DeadMethods.scan_all
+          dead_method = dead_methods.find { |method| method.class_name == :Dog }
+          assert(dead_method)
+          assert_equal(4, dead_method.first_line_number)
+          assert_equal(6, dead_method.last_line_number)
+        end
+
         def test_output_all
           require_unique_file
           @coverband.report_coverage