Update or remove tests using result predicate methods

spec/errored_result_spec.cr

@@ -15,30 +15,6 @@ def new_errored_result(
 end
 
 describe Spectator::ErroredResult do
-  describe "#errored?" do
-    it "is true" do
-      new_errored_result.errored?.should be_true
-    end
-  end
-
-  describe "#passed?" do
-    it "is false" do
-      new_errored_result.passed?.should be_false
-    end
-  end
-
-  describe "#failed?" do
-    it "is true" do
-      new_errored_result.failed?.should be_true
-    end
-  end
-
-  describe "#pending?" do
-    it "is false" do
-      new_errored_result.pending?.should be_false
-    end
-  end
-
   describe "#example" do
     it "is the expected value" do
       example = FailingExample.create

spec/failed_result_spec.cr

@@ -15,30 +15,6 @@ def new_failed_result(
 end
 
 describe Spectator::FailedResult do
-  describe "#passed?" do
-    it "is false" do
-      new_failed_result.passed?.should be_false
-    end
-  end
-
-  describe "#failed?" do
-    it "is true" do
-      new_failed_result.failed?.should be_true
-    end
-  end
-
-  describe "#errored?" do
-    it "is false" do
-      new_failed_result.errored?.should be_false
-    end
-  end
-
-  describe "#pending?" do
-    it "is false" do
-      new_failed_result.pending?.should be_false
-    end
-  end
-
   describe "#example" do
     it "is the expected value" do
       example = FailingExample.create

spec/internals/harness_spec.cr

@@ -15,7 +15,7 @@ describe Spectator::Internals::Harness do
       it "returns a passing result" do
         example = PassingExample.create
         result = Spectator::Internals::Harness.run(example)
-        result.passed?.should be_true
+        result.should be_a(Spectator::SuccessfulResult)
       end
     end
 
@@ -23,7 +23,7 @@ describe Spectator::Internals::Harness do
       it "returns a failing result" do
         example = FailingExample.create
         result = Spectator::Internals::Harness.run(example)
-        result.passed?.should be_false
+        result.should be_a(Spectator::FailedResult)
       end
     end
   end

spec/pending_result_spec.cr

@@ -5,30 +5,6 @@ def new_pending_result(example : Spectator::Example? = nil)
 end
 
 describe Spectator::PendingResult do
-  describe "#pending?" do
-    it "is true" do
-      new_pending_result.pending?.should be_true
-    end
-  end
-
-  describe "#passed?" do
-    it "is false" do
-      new_pending_result.passed?.should be_false
-    end
-  end
-
-  describe "#failed?" do
-    it "is false" do
-      new_pending_result.failed?.should be_false
-    end
-  end
-
-  describe "#errored?" do
-    it "is false" do
-      new_pending_result.errored?.should be_false
-    end
-  end
-
   describe "#example" do
     it "is the expected value" do
       example = PassingExample.create

spec/successful_result_spec.cr

@@ -13,30 +13,6 @@ def new_successful_result(
 end
 
 describe Spectator::SuccessfulResult do
-  describe "#passed?" do
-    it "is true" do
-      new_successful_result.passed?.should be_true
-    end
-  end
-
-  describe "#failed?" do
-    it "is false" do
-      new_successful_result.failed?.should be_false
-    end
-  end
-
-  describe "#errored?" do
-    it "is false" do
-      new_successful_result.errored?.should be_false
-    end
-  end
-
-  describe "#pending?" do
-    it "is false" do
-      new_successful_result.pending?.should be_false
-    end
-  end
-
   describe "#example" do
     it "is the expected value" do
       example = PassingExample.create