Add test coverage for many extra integer functions and exception values.

Author: dmsc

testsuite/tests/misc-int.bas

@@ -0,0 +1,30 @@
+' Test for statement ""
+? "Start"
+A=0
+? SGN(A)
+A=123
+? SGN(A)
+A=-512
+? SGN(A)
+A=1234
+B=1234
+? A/B
+A=-123
+B=5
+? A/B, A MOD B
+A=123
+B=-5
+? A/B, A MOD B
+A=0
+B=0
+? A/B, A MOD B
+A=VAL("66500") : B=ERR()
+? A, B
+' Test integer overflow conditions in comparisons:
+? -20000 < 15000, -10000 < 15000, -20000 < -30000, -20000 < -15000
+?  20000 < 15000,  10000 < 15000,  20000 < -30000,  20000 < -15000
+? -20000 > 15000, -10000 > 15000, -20000 > -30000, -20000 > -15000
+?  20000 > 15000,  10000 > 15000,  20000 > -30000,  20000 > -15000
+' Test for strings > 128 characters into VAL
+S$="000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000123400000000000000"
+? VAL(S$)

testsuite/tests/misc-int.chk

@@ -0,0 +1,17 @@
+Name: Test miscellaneous integer functions
+Test: run
+Output:
+Start
+0
+1
+-1
+1
+-24       -3
+-24       3
+-1        0
+771       18
+1         1         0         1
+0         1         0         0
+0         0         1         0
+1         0         1         1
+12340