Add dummy instance values

spec/helpers/errored_example.cr

@@ -5,6 +5,11 @@ class ErroredExample < Spectator::RunnableExample
     "ERROR"
   end
 
+  # Dummy instance.
+  def instance
+    nil
+  end
+
   # Run the example that always produces an error.
   private def run_instance
     raise "Oops"

spec/helpers/failing_example.cr

@@ -5,6 +5,11 @@ class FailingExample < Spectator::RunnableExample
     "FAIL"
   end
 
+  # Dummy instance.
+  def instance
+    nil
+  end
+
   # Run the example that always fails.
   private def run_instance
     report_expectations(0, 1)

spec/helpers/passing_example.cr

@@ -5,6 +5,11 @@ class PassingExample < Spectator::RunnableExample
     "PASS"
   end
 
+  # Dummy instance.
+  def instance
+    nil
+  end
+
   # Run the example that always passes.
   # If this doesn't something broke.
   private def run_instance

spec/helpers/spy_example.cr

@@ -6,6 +6,11 @@ class SpyExample < Spectator::RunnableExample
     "SPY"
   end
 
+  # Dummy instance.
+  def instance
+    nil
+  end
+
   # Captures the sample values when the example is created.
   def initialize(group, @sample_values)
     super(group, @sample_values)

spec/pending_example_spec.cr

@@ -4,6 +4,10 @@ class ConcretePendingExample < Spectator::PendingExample
   def what
     "PENDING_TEST_EXAMPLE"
   end
+
+  def instance
+    nil
+  end
 end
 
 def new_pending_example(group : Spectator::ExampleGroup? = nil)