Add superclass tests for Exceptions

test/t/argumenterror.rb

@@ -13,3 +13,8 @@ assert('ArgumentError', '15.2.24') do
 
   ArgumentError.class == Class and e2.class == ArgumentError
 end
+
+assert('ArgumentError superclass', '15.2.24.2') do
+  ArgumentError.superclass == StandardError
+end
+

test/t/exception.rb

@@ -5,6 +5,10 @@ assert('Exception', '15.2.22') do
   Exception.class == Class
 end
 
+assert('Exception superclass', '15.2.22.2') do
+  Exception.superclass == Object
+end
+
 assert('Exception.exception', '15.2.22.4.1') do
   e = Exception.exception('a')
 

test/t/indexerror.rb

@@ -4,3 +4,8 @@
 assert('IndexError', '15.2.33') do
   IndexError.class == Class
 end
+
+assert('IndexError superclass', '15.2.33.2') do
+  IndexError.superclass == StandardError
+end
+

test/t/nameerror.rb

@@ -5,6 +5,10 @@ assert('NameError', '15.2.31') do
   NameError.class == Class
 end
 
+assert('NameError superclass', '15.2.31.2') do
+  NameError.superclass == StandardError
+end
+
 # TODO 15.2.31.2.1 NameError#name
 
 assert('NameError#initialize', '15.2.31.2.2') do

test/t/nomethoderror.rb

@@ -11,3 +11,8 @@ assert('NoMethodError', '15.2.32') do
 
   NoMethodError.class == Class and e2.class == NoMethodError
 end
+
+assert('NoMethodError superclass', '15.2.32.2') do
+  NoMethodError.superclass == NameError
+end
+

test/t/rangeerror.rb

@@ -4,3 +4,8 @@
 assert('RangeError', '15.2.26') do
   RangeError.class == Class
 end
+
+assert('RangeError superclass', '15.2.26.2') do
+  RangeError.superclass == StandardError
+end
+

test/t/standarderror.rb

@@ -4,3 +4,8 @@
 assert('StandardError', '15.2.23') do
   StandardError.class == Class
 end
+
+assert('StandardError superclass', '15.2.23.2') do
+  StandardError.superclass == Exception
+end
+

test/t/typeerror.rb

@@ -4,3 +4,8 @@
 assert('TypeError', '15.2.29') do
   TypeError.class == Class
 end
+
+assert('TypeError superclass', '15.2.29.2') do
+  TypeError.superclass == StandardError
+end
+