Add Tests for Integer

test/t/integer.rb

+##
+# Integer ISO Test
+
+assert('Integer', '15.2.8') do
+  Integer.class == Class
+end
+
+assert('Integer#+', '15.2.8.3.1') do
+  a = 1+1
+  b = 1+1.0
+
+  a == 2 and b == 2.0
+end
+
+assert('Integer#-', '15.2.8.3.2') do
+  a = 2-1
+  b = 2-1.0
+
+  a == 1 and b == 1.0
+end
+
+assert('Integer#*', '15.2.8.3.3') do
+  a = 1*1
+  b = 1*1.0
+
+  a == 1 and b == 1.0
+end
+
+assert('Integer#/', '15.2.8.3.4') do
+  a = 2/1
+  b = 2/1.0
+
+  a == 2 and b == 2.0
+end
+
+assert('Integer#%', '15.2.8.3.5') do
+  a = 1%1
+  b = 1%1.0
+  c = 2%4
+
+  a == 0 and b == 0.0 and c == 2
+end
+
+assert('Integer#<=>', '15.2.8.3.6') do
+  a = 1<=>0
+  b = 1<=>1
+  c = 1<=>2
+
+  a == 1 and b == 0 and c == -1
+end
+
+assert('Integer#==', '15.2.8.3.7') do
+  a = 1==0
+  b = 1==1
+
+  a == false and b == true
+end
+