Allow test description to be blank

Currently defaults to the example's source.

src/spectator/dsl/examples.cr

@@ -3,7 +3,7 @@ require "../spec_builder"
 
 module Spectator
   module DSL
-    macro it(description, _source_file = __FILE__, _source_line = __LINE__, &block)
+    macro it(description = nil, _source_file = __FILE__, _source_line = __LINE__, &block)
       {% if block.is_a?(Nop) %}
         {% if description.is_a?(Call) %}
           def %run
@@ -20,17 +20,17 @@ module Spectator
 
       %source = ::Spectator::Source.new({{_source_file}}, {{_source_line}})
       ::Spectator::SpecBuilder.add_example(
-        {{description.is_a?(StringLiteral) ? description : description.stringify}},
+        {{description.is_a?(StringLiteral) || description.is_a?(NilLiteral) ? description : description.stringify}},
         %source,
         {{@type.name}}
       ) { |test| test.as({{@type.name}}).%run }
     end
 
-    macro specify(description, &block)
+    macro specify(description = nil, &block)
       it({{description}}) {{block}}
     end
 
-    macro pending(description, _source_file = __FILE__, _source_line = __LINE__, &block)
+    macro pending(description = nil, _source_file = __FILE__, _source_line = __LINE__, &block)
       {% if block.is_a?(Nop) %}
         {% if description.is_a?(Call) %}
           def %run
@@ -47,17 +47,17 @@ module Spectator
 
       %source = ::Spectator::Source.new({{_source_file}}, {{_source_line}})
       ::Spectator::SpecBuilder.add_pending_example(
-        {{description.is_a?(StringLiteral) ? description : description.stringify}},
+        {{description.is_a?(StringLiteral) || description.is_a?(NilLiteral) ? description : description.stringify}},
         %source,
         {{@type.name}}
       ) { |test| test.as({{@type.name}}).%run }
     end
 
-    macro skip(description, &block)
+    macro skip(description = nil, &block)
       pending({{description}}) {{block}}
     end
 
-    macro xit(description, &block)
+    macro xit(description = nil, &block)
       pending({{description}}) {{block}}
     end
   end

src/spectator/example.cr

@@ -23,7 +23,7 @@ module Spectator
       @test_wrapper.source
     end
 
-    def description : String | Symbol
+    def description : String | Symbol?
       @test_wrapper.description
     end
 

src/spectator/spec_builder.cr

@@ -42,7 +42,7 @@ module Spectator
     # Adds an example type to the current group.
     # The class name of the example should be passed as an argument.
     # The example will be instantiated later.
-    def add_example(description : String, source : Source,
+    def add_example(description : String?, source : Source,
                     example_type : ::SpectatorTest.class, &runner : ::SpectatorTest ->) : Nil
       builder = ->(values : TestValues) { example_type.new(values).as(::SpectatorTest) }
       factory = RunnableExampleBuilder.new(description, source, builder, runner)
@@ -52,7 +52,7 @@ module Spectator
     # Adds an example type to the current group.
     # The class name of the example should be passed as an argument.
     # The example will be instantiated later.
-    def add_pending_example(description : String, source : Source,
+    def add_pending_example(description : String?, source : Source,
                             example_type : ::SpectatorTest.class, &runner : ::SpectatorTest ->) : Nil
       builder = ->(values : TestValues) { example_type.new(values).as(::SpectatorTest) }
       factory = PendingExampleBuilder.new(description, source, builder, runner)

src/spectator/spec_builder/example_builder.cr

@@ -6,7 +6,7 @@ module Spectator::SpecBuilder
   abstract class ExampleBuilder
     alias FactoryMethod = TestValues -> ::SpectatorTest
 
-    def initialize(@description : String, @source : Source, @builder : FactoryMethod, @runner : TestMethod)
+    def initialize(@description : String?, @source : Source, @builder : FactoryMethod, @runner : TestMethod)
     end
 
     abstract def build(group) : ExampleComponent

src/spectator/test_wrapper.cr

@@ -17,6 +17,11 @@ module Spectator
     def initialize(@description : String, @source : Source, @test : ::SpectatorTest, @runner : TestMethod)
     end
 
+    # Creates a wrapper for the test.
+    def initialize(description : Nil, @source : Source, @test : ::SpectatorTest, @runner : TestMethod)
+      @description = @source.to_s
+    end
+
     def run
       call(@runner)
     end