Add pass?/fail? methods to Result types

src/spectator/fail_result.cr

@@ -25,6 +25,16 @@ module Spectator
       visitor.failure(yield self)
     end
 
+    # Indicates whether the example passed.
+    def pass? : Bool
+      false
+    end
+
+    # Indicates whether the example failed.
+    def fail? : Bool
+      true
+    end
+
     # One-word description of the result.
     def to_s(io)
       io << "fail"

src/spectator/pass_result.cr

@@ -13,6 +13,16 @@ module Spectator
       visitor.pass(yield self)
     end
 
+    # Indicates whether the example passed.
+    def pass? : Bool
+      true
+    end
+
+    # Indicates whether the example failed.
+    def fail? : Bool
+      false
+    end
+
     # One-word description of the result.
     def to_s(io)
       io << "pass"

src/spectator/pending_result.cr

@@ -21,6 +21,16 @@ module Spectator
       visitor.pending(yield self)
     end
 
+    # Indicates whether the example passed.
+    def pass? : Bool
+      false
+    end
+
+    # Indicates whether the example failed.
+    def fail? : Bool
+      false
+    end
+
     # One-word description of the result.
     def to_s(io)
       io << "pending"

src/spectator/result.cr

@@ -17,6 +17,12 @@ module Spectator
     # This is the visitor design pattern.
     abstract def accept(visitor)
 
+    # Indicates whether the example passed.
+    abstract def pass? : Bool
+
+    # Indicates whether the example failed.
+    abstract def fail? : Bool
+
     # Creates a JSON object from the result information.
     def to_json(json : ::JSON::Builder, example)
       json.object do