diff --git a/test/02-mode.txt b/test/02-mode.txt
index 27156a5..fdfd446 100644
--- a/test/02-mode.txt
+++ b/test/02-mode.txt
@@ -35,3 +35,4 @@ drop
 -> stack should be 1.00e+00
 drop
 
+default
diff --git a/test/06-real.txt b/test/06-real.txt
index 5f106be..e2e3278 100644
--- a/test/06-real.txt
+++ b/test/06-real.txt
@@ -68,5 +68,238 @@ drop
 # prec error (2)
 0x8000000000000000 prec
 -> error should be 4
+erase default
+
+# add (1)
+1.2 2.3 +
+-> stack should be 3.5
+drop
+
+# add (2)
+1.2 2.3+
+-> stack should be 3.5
+drop
+
+# add (3)
+2.3 +
+-> error should be 2
+-> stack size should be 1
+drop
+
+# add (4)
++
+-> error should be 2
+drop
+
+# sub (1)
+1.2 2.3 -
+-> stack should be -1.1
+drop
+
+# sub (2)
+1.2 2.3-
+-> stack should be -1.1
+drop
+
+# sub (3)
+2.3 -
+-> error should be 2
+-> stack size should be 1
+drop
+
+# sub (4)
+-
+-> error should be 2
+drop
+
+# mul (1)
+1.2 2.3 *
+-> stack should be 2.76
+drop
+
+# mul (2)
+1.2 2.3*
+-> stack should be 2.76
+drop
+
+# mul (3)
+2.3 *
+-> error should be 2
+-> stack size should be 1
+drop
+
+# mul (4)
+*
+-> error should be 2
+drop
+
+# div (1)
+1.2 2.3 /
+-> stack should be 0.5217391304347826087
+drop
+
+# div (2)
+1.2 2.3/
+-> stack should be 0.5217391304347826087
+drop
+
+# div (3)
+2.3 /
+-> error should be 2
+-> stack size should be 1
+drop
+
+# div (4)
+/
+-> error should be 2
+drop
+
+# chs (1)
+3.14 chs
+-> stack should be -3.14
+drop
+
+# chs (2)
+chs
+-> error should be 2
+
+# neg (1)
+3.14 neg
+-> stack should be -3.14
+drop
+
+# neg (2)
+neg
+-> error should be 2
+
+# inv (1)
+2 inv
+-> stack should be 0.5
+drop
+
+# inv (2)
+inv
+-> error should be 2
+
+# % (1)
+2 30 % 
+-> stack should be 0.6
+erase
+
+# % (2)
+2 30% 
+-> stack should be 0.6
+erase
+
+# % (3)
+2 % 
+-> error should be 2
+-> stack size should be 1
+drop
+
+# % (4)
+% 
+-> error should be 2
+drop
+
+# %CH (1)
+2 0.6 %CH
+-> stack should be 30
+erase
+
+# %CH (2)
+2 0.6%CH
+-> stack should be 30
+erase
+
+# %CH (3)
+2 %CH
+-> error should be 2
+-> stack size should be 1
+drop
+
+# %CH (4)
+%CH
+-> error should be 2
+drop
+
+# ^ (1)
+2 10 ^
+-> stack should be 1024
+erase
+
+# ^ (2)
+2 10^
+-> stack should be 1024
+erase
+
+# ^ (3)
+2 ^
+-> error should be 2
+-> stack size should be 1
+erase
+
+# ^ (4)
+^
+-> error should be 2
+erase
+
+# sqrt (1)
+9 sqrt
+-> stack should be 3
+drop
+
+# sqrt (2)
+sqrt
+-> error should be 2
+
+# sq (1)
+12 sq
+-> stack should be 144
+drop
+
+# sq (2)
+sq
+-> error should be 2
+
+# sqr (1)
+12 sqr
+-> stack should be 144
+drop
+
+# sqr (2)
+sqr
+-> error should be 2
+
+# mod (1)
+9 4 mod
+-> stack should be 1
+erase
+
+# mod (2)
+9 mod
+-> error should be 2
+-> stack size should be 1
+erase
+
+# mod (3)
+mod
+-> error should be 2
+erase
+
+# abs (1)
+-9 abs
+-> stack should be 9
+erase
+
+# abs (2)
+9 abs
+-> stack should be 9
+erase
+
+# abs (3)
+abs
+-> error should be 2
+erase
 
 default