Use standard status text

src/spectator/formatting/failure_junit_test_case.cr

@@ -10,6 +10,11 @@ module Spectator::Formatting
     def initialize(@result : FailedResult)
     end
 
+    # Status string specific to the result type.
+    private def status
+      "FAIL"
+    end
+
     # Adds the failed expectations to the XML block.
     private def content(xml)
       super

src/spectator/formatting/junit_test_case.cr

@@ -12,7 +12,7 @@ module Spectator::Formatting
     private def attributes
       {
         name:      result.example,
-        status:    result,
+        status:    status,
         classname: classname,
       }
     end
@@ -20,6 +20,9 @@ module Spectator::Formatting
     # Result to pull values from.
     private abstract def result
 
+    # Status string specific to the result type.
+    private abstract def status : String
+
     # Adds additional content to the "testcase" XML block.
     # Override this to add more content.
     private def content(xml)

src/spectator/formatting/skipped_junit_test_case.cr

@@ -10,6 +10,11 @@ module Spectator::Formatting
     def initialize(@result : PendingResult)
     end
 
+    # Status string specific to the result type.
+    private def status
+      "TODO"
+    end
+
     # Adds the skipped tag to the XML block.
     private def content(xml)
       super

src/spectator/formatting/successful_junit_test_case.cr

@@ -7,5 +7,10 @@ module Spectator::Formatting
     # Creates the JUnit test case.
     def initialize(@result : SuccessfulResult)
     end
+
+    # Status string specific to the result type.
+    private def status
+      "PASS"
+    end
   end
 end