Add tests for string division/splitting

tests/all.test

@@ -583,10 +583,26 @@ def inc(x): x |= .+1; inc(.[].a)
 ["fo", "foo", "barfoo", "foobar", "barfoob"]
 [false, true, true, false, false]
 
+[.[]|split(",")]
+["a, bc, def, ghij, jklmn, a,b, c,d, e,f", "a,b,c,d, e,f,g,h"]
+[["a"," bc"," def"," ghij"," jklmn"," a","b"," c","d"," e","f"],["a","b","c","d"," e","f","g","h"]]
+
+[.[]|split(", ")]
+["a, bc, def, ghij, jklmn, a,b, c,d, e,f", "a,b,c,d, e,f,g,h"]
+[["a","bc","def","ghij","jklmn","a,b","c,d","e,f"],["a,b,c,d","e,f,g,h"]]
+
 [.[] * 3]
 ["a", "ab", "abc"]
 ["aaa", "ababab", "abcabcabc"]
 
+[.[] / ","]
+["a, bc, def, ghij, jklmn, a,b, c,d, e,f", "a,b,c,d, e,f,g,h"]
+[["a"," bc"," def"," ghij"," jklmn"," a","b"," c","d"," e","f"],["a","b","c","d"," e","f","g","h"]]
+
+[.[] / ", "]
+["a, bc, def, ghij, jklmn, a,b, c,d, e,f", "a,b,c,d, e,f,g,h"]
+[["a","bc","def","ghij","jklmn","a,b","c,d","e,f"],["a,b,c,d","e,f,g,h"]]
+
 map(.[1] as $needle | .[0] | contains($needle))
 [[[],[]], [[1,2,3], [1,2]], [[1,2,3], [3,1]], [[1,2,3], [4]], [[1,2,3], [1,4]]]
 [true, true, true, false, false]