Remove shared elapsed time

Since PendingResult always returns zero, it's not necessary to store it.

src/spectator/failed_result.cr

@@ -9,14 +9,17 @@ module Spectator
     # The expectations that were run in the example.
     getter expectations : Expectations::ExampleExpectations
 
+    # Length of time it took to run the example.
+    getter elapsed : Time::Span
+
     # Creates a failed result.
     # The `example` should refer to the example that was run
     # and that this result is for.
     # The `elapsed` argument is the length of time it took to run the example.
     # The `expectations` references the expectations that were checked in the example.
     # The `error` is the exception that was raised to cause the failure.
-    def initialize(example, elapsed, @expectations, @error)
-      super(example, elapsed)
+    def initialize(example, @elapsed, @expectations, @error)
+      super(example)
     end
 
     # Indicates that an example was run and it was successful.

src/spectator/pending_result.cr

@@ -5,11 +5,9 @@ module Spectator
   # A pending result means the example is not ready to run yet.
   # This can happen when the functionality to be tested is not implemented yet.
   class PendingResult < Result
-    # Creates a pending result.
-    # The `example` should refer to the example that was run
-    # and that this result is for.
-    def initialize(example)
-      super(example, Time::Span.zero)
+    # Length of time it took to run the example.
+    def elapsed : Time::Span
+      Time::Span.zero
     end
 
     # Indicates that an example was run and it was successful.

src/spectator/result.cr

@@ -6,7 +6,7 @@ module Spectator
     getter example : Example
 
     # Length of time it took to run the example.
-    getter elapsed : Time::Span
+    abstract def elapsed : Time::Span
 
     # Indicates that an example was run and it was successful.
     # NOTE: Examples with warnings count as successful.
@@ -25,8 +25,7 @@ module Spectator
     # Constructs the base of the result.
     # The `example` should refer to the example that was run
     # and that this result is for.
-    # The `elapsed` argument is the length of time it took to run the example.
-    private def initialize(@example, @elapsed)
+    def initialize(@example)
     end
   end
 end

src/spectator/successful_result.cr

@@ -6,13 +6,16 @@ module Spectator
     # The expectations that were run in the example.
     getter expectations : Expectations::ExampleExpectations
 
+    # Length of time it took to run the example.
+    getter elapsed : Time::Span
+
     # Creates a successful result.
     # The `example` should refer to the example that was run
     # and that this result is for.
     # The `elapsed` argument is the length of time it took to run the example.
     # The `expectations` references the expectations that were checked in the example.
-    def initialize(example, elapsed, @expectations)
-      super(example, elapsed)
+    def initialize(example, @elapsed, @expectations)
+      super(example)
     end
 
     # Indicates that an example was run and it was successful.