Add tests for unstable proc sgn / bigint.sgn

---
Signed-off-by: Michael Ferguson <[email protected]>

test/unstable/BigInteger/unstable-sgn-bigint.chpl

@@ -0,0 +1,5 @@
+use BigInteger;
+
+// bigint
+var b = new bigint(1);
+assert(b.sgn() == 1);

test/unstable/BigInteger/unstable-sgn-bigint.good

@@ -0,0 +1 @@
+unstable-sgn-bigint.chpl:5: warning: bigint.sgn is unstable and may change its name and return type in the future

test/unstable/unstable-sgn.chpl

@@ -0,0 +1,48 @@
+// non-param numeric types
+var i8: int(8) = 1;
+var i16: int(16) = 1;
+var i32: int(32) = 1;
+var i64: int(64) = 1;
+assert(sgn(i8) == 1);
+assert(sgn(i16) == 1);
+assert(sgn(i32) == 1);
+assert(sgn(i64) == 1);
+
+var u8: uint(8) = 1;
+var u16: uint(16) = 1;
+var u32: uint(32) = 1;
+var u64: uint(64) = 1;
+assert(sgn(u8) == 1);
+assert(sgn(u16) == 1);
+assert(sgn(u32) == 1);
+assert(sgn(u64) == 1);
+
+var r32: real(32) = 1;
+var r64: real(64) = 1;
+assert(sgn(r32) == 1);
+assert(sgn(r64) == 1);
+
+
+// param numeric types
+param pi8: int(8) = 1;
+param pi16: int(16) = 1;
+param pi32: int(32) = 1;
+param pi64: int(64) = 1;
+assert(sgn(pi8) == 1);
+assert(sgn(pi16) == 1);
+assert(sgn(pi32) == 1);
+assert(sgn(pi64) == 1);
+
+param pu8: uint(8) = 1;
+param pu16: uint(16) = 1;
+param pu32: uint(32) = 1;
+param pu64: uint(64) = 1;
+assert(sgn(pu8) == 1);
+assert(sgn(pu16) == 1);
+assert(sgn(pu32) == 1);
+assert(sgn(pu64) == 1);
+
+param pr32: real(32) = 1;
+param pr64: real(64) = 1;
+assert(sgn(pr32) == 1);
+assert(sgn(pr64) == 1);

test/unstable/unstable-sgn.good

@@ -0,0 +1,20 @@
+unstable-sgn.chpl:6: warning: sgn is unstable and may change its name and return type in the future
+unstable-sgn.chpl:7: warning: sgn is unstable and may change its name and return type in the future
+unstable-sgn.chpl:8: warning: sgn is unstable and may change its name and return type in the future
+unstable-sgn.chpl:9: warning: sgn is unstable and may change its name and return type in the future
+unstable-sgn.chpl:15: warning: sgn is unstable and may change its name and return type in the future
+unstable-sgn.chpl:16: warning: sgn is unstable and may change its name and return type in the future
+unstable-sgn.chpl:17: warning: sgn is unstable and may change its name and return type in the future
+unstable-sgn.chpl:18: warning: sgn is unstable and may change its name and return type in the future
+unstable-sgn.chpl:22: warning: sgn is unstable and may change its name and return type in the future
+unstable-sgn.chpl:23: warning: sgn is unstable and may change its name and return type in the future
+unstable-sgn.chpl:31: warning: sgn is unstable and may change its name and return type in the future
+unstable-sgn.chpl:32: warning: sgn is unstable and may change its name and return type in the future
+unstable-sgn.chpl:33: warning: sgn is unstable and may change its name and return type in the future
+unstable-sgn.chpl:34: warning: sgn is unstable and may change its name and return type in the future
+unstable-sgn.chpl:40: warning: sgn is unstable and may change its name and return type in the future
+unstable-sgn.chpl:41: warning: sgn is unstable and may change its name and return type in the future
+unstable-sgn.chpl:42: warning: sgn is unstable and may change its name and return type in the future
+unstable-sgn.chpl:43: warning: sgn is unstable and may change its name and return type in the future
+unstable-sgn.chpl:47: warning: sgn is unstable and may change its name and return type in the future
+unstable-sgn.chpl:48: warning: sgn is unstable and may change its name and return type in the future