Change `-e` to use partial instead of exact match

Fixes https://gitlab.com/arctic-fox/spectator/-/issues/71
Fixes https://github.com/icy-arctic-fox/spectator/issues/45

CHANGELOG.md

@@ -8,6 +8,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 - `expect_raises` with block and no arguments produces compilation error. [#77](https://gitlab.com/arctic-fox/spectator/-/issues/77)
 
+### Changed
+- `-e` (`--example`) CLI option performs a partial match instead of exact match. [#71](https://gitlab.com/arctic-fox/spectator/-/issues/71) [#45](https://github.com/icy-arctic-fox/spectator/issues/45)
+
 ## [0.11.1] - 2022-07-18
 ### Fixed
 - Workaround nilable type issue with memoized value. [#76](https://gitlab.com/arctic-fox/spectator/-/issues/76)

src/spectator/config/cli_arguments_applicator.cr

@@ -112,7 +112,7 @@ module Spectator
       # Adds the example filter option to the parser.
       private def example_option(parser, builder)
         parser.on("-e", "--example STRING", "Run examples whose full nested names include STRING") do |pattern|
-          Log.debug { "Filtering for examples named '#{pattern}' (-e '#{pattern}')" }
+          Log.debug { "Filtering for examples containing '#{pattern}' (-e '#{pattern}')" }
           filter = NameNodeFilter.new(pattern)
           builder.add_node_filter(filter)
         end

src/spectator/name_node_filter.cr

@@ -9,7 +9,7 @@ module Spectator
 
     # Checks whether the node satisfies the filter.
     def includes?(node) : Bool
-      @name == node.to_s
+      node.to_s.includes?(@name)
     end
   end
 end