thoughtbot/shoulda-matchers · error · ArgumentError

When specifying a value as a block, a context must be specif

Error message

When specifying a value as a block, a context must be specified beforehand, e.g., #{store.name}.in_context(context).to { ... }

What it means

Error "When specifying a value as a block, a context must be specified beforehand, e.g., #{store.name}.in_context(context).to { ... }" thrown in thoughtbot/shoulda-matchers.

Source

Thrown at lib/shoulda/matchers/action_controller/set_session_or_flash_matcher.rb:26

        end

        def in_context(context)
          @context = context
          self
        end

        def [](key)
          @key = key
          self
        end

        def to(expected_value = nil, &block)
          if block
            unless context_set?
              message = 'When specifying a value as a block, a context must be'\
                ' specified beforehand,'\
                " e.g., #{store.name}.in_context(context).to { ... }"
              raise ArgumentError, message
            end

            @expected_value = context.instance_eval(&block)
          else
            @expected_value = expected_value
          end

          self
        end

        def description
          "should #{expectation_description}"
        end

        def matches?(controller)
          @controller = store.controller = controller
          !store.empty? && key_matches? && expected_value_matches?
        end

View on GitHub (pinned to 79cdfbc326)

When it happens

Trigger: Thrown at lib/shoulda/matchers/action_controller/set_session_or_flash_matcher.rb:26 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of thoughtbot/shoulda-matchers@79cdfbc326 (2026-08-23). Data as JSON: /api/errors/8d67fe5141150617. Report an issue: GitHub.