diff --git a/src/spectator/dsl/groups.cr b/src/spectator/dsl/groups.cr
index dbf6d60..309ba68 100644
--- a/src/spectator/dsl/groups.cr
+++ b/src/spectator/dsl/groups.cr
@@ -35,7 +35,10 @@ module Spectator
       end
 
       class Context%sample < {{@type.id}}
-        ::Spectator::SpecBuilder.start_sample_group({{what.stringify}})
+        ::Spectator::SpecBuilder.start_sample_group({{what.stringify}}, :%sample) do |values|
+          sample = Sample%sample.new(values)
+          sample.%collection.to_a
+        end
 
         def {{block_arg}}
           1
diff --git a/src/spectator/spec_builder.cr b/src/spectator/spec_builder.cr
index a5efc17..7b0c93c 100644
--- a/src/spectator/spec_builder.cr
+++ b/src/spectator/spec_builder.cr
@@ -26,8 +26,8 @@ module Spectator
     # when the group being started is finished.
     # See `SampleExampleGroupBuilder#initialize` for the arguments
     # as arguments to this method are passed directly to it.
-    def start_sample_group(*args) : Nil
-      group = SampleExampleGroupBuilder.new(*args)
+    def start_sample_group(*args, &block : TestValues -> Array(T)) : Nil forall T
+      group = SampleExampleGroupBuilder(T).new(*args, block)
       @@stack.push(group)
     end
 
diff --git a/src/spectator/spec_builder/sample_example_group_builder.cr b/src/spectator/spec_builder/sample_example_group_builder.cr
index a7b3463..aab9a03 100644
--- a/src/spectator/spec_builder/sample_example_group_builder.cr
+++ b/src/spectator/spec_builder/sample_example_group_builder.cr
@@ -1,15 +1,17 @@
 require "./nested_example_group_builder"
 
 module Spectator::SpecBuilder
-  class SampleExampleGroupBuilder < NestedExampleGroupBuilder
-    def initialize(@what : String | Symbol)
-      @id = :TODO
+  class SampleExampleGroupBuilder(T) < NestedExampleGroupBuilder
+    def initialize(what : String | Symbol, @id : Symbol, @collection_builder : TestValues -> Array(T))
+      super(what)
     end
 
     def build(parent_group)
-      context = TestContext.new(parent_group.context, build_hooks, parent_group.context.values)
+      values = parent_group.context.values
+      collection = @collection_builder.call(values)
+      context = TestContext.new(parent_group.context, build_hooks, values)
       NestedExampleGroup.new(@what, parent_group, context).tap do |group|
-        group.children = [:TODO].map do |element|
+        group.children = collection.map do |element|
           build_sub_group(group, element).as(ExampleComponent)
         end
       end
@@ -18,7 +20,7 @@ module Spectator::SpecBuilder
     private def build_sub_group(parent_group, element)
       values = parent_group.context.values.add(@id, @what.to_s, element)
       context = TestContext.new(parent_group.context, ExampleHooks.empty, values)
-      NestedExampleGroup.new("TODO", parent_group, context).tap do |group|
+      NestedExampleGroup.new(element.inspect, parent_group, context).tap do |group|
         group.children = children.map do |child|
           child.build(group).as(ExampleComponent)
         end