diff -r 874cc78cdffd -r e5b29e6f0615 tests/test_string.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test_string.c	Thu Dec 28 20:37:53 2023 +0100
@@ -0,0 +1,986 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2023 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "cx/test.h"
+#include "util_allocator.h"
+
+#include "cx/string.h"
+
+#define ASSERT_ZERO_TERMINATED(str) CX_TEST_ASSERTM((str).ptr[(str).length] == '\0', \
+    #str " is not zero terminated")
+
+CX_TEST(test_string_construct) {
+    cxstring s1 = CX_STR("1234");
+    cxstring s2 = cx_strn("abcd", 2);
+    cxmutstr s3 = cx_mutstr((char *) "1234");
+    cxmutstr s4 = cx_mutstrn((char *) "abcd", 2);
+    CX_TEST_DO {
+        CX_TEST_ASSERT(s1.length == 4);
+        CX_TEST_ASSERT(strncmp(s1.ptr, "1234", 4) == 0);
+        CX_TEST_ASSERT(s2.length == 2);
+        CX_TEST_ASSERT(strncmp(s2.ptr, "ab", 2) == 0);
+        CX_TEST_ASSERT(s3.length == 4);
+        CX_TEST_ASSERT(strncmp(s3.ptr, "1234", 4) == 0);
+        CX_TEST_ASSERT(s4.length == 2);
+        CX_TEST_ASSERT(strncmp(s4.ptr, "ab", 2) == 0);
+    }
+}
+
+CX_TEST(test_strfree) {
+    CxTestingAllocator talloc;
+    cx_testing_allocator_init(&talloc);
+    CxAllocator *alloc = &talloc.base;
+    CX_TEST_DO {
+        char *test = cxMalloc(alloc, 16);
+        cxmutstr str = cx_mutstrn(test, 16);
+        CX_TEST_ASSERT(str.ptr == test);
+        CX_TEST_ASSERT(str.length == 16);
+        cx_strfree_a(alloc, &str);
+        CX_TEST_ASSERT(str.ptr == NULL);
+        CX_TEST_ASSERT(str.length == 0);
+        CX_TEST_ASSERT(cx_testing_allocator_verify(&talloc));
+    }
+    cx_testing_allocator_destroy(&talloc);
+}
+
+CX_TEST(test_strdup) {
+    cxstring str = CX_STR("test");
+    cxmutstr dup = cx_strdup(str);
+    CX_TEST_DO {
+        CX_TEST_ASSERT(dup.length == str.length);
+        CX_TEST_ASSERT(0 == strcmp(dup.ptr, str.ptr));
+        ASSERT_ZERO_TERMINATED(dup);
+    }
+    cx_strfree(&dup);
+}
+
+CX_TEST(test_strdup_shortened) {
+    cxstring str = CX_STR("test");
+    str.length = 2;
+    cxmutstr dup = cx_strdup(str);
+    CX_TEST_DO {
+        CX_TEST_ASSERT(dup.length == str.length);
+        CX_TEST_ASSERT(0 == strcmp(dup.ptr, "te"));
+        ASSERT_ZERO_TERMINATED(dup);
+    }
+    cx_strfree(&dup);
+}
+
+CX_TEST(test_strlen) {
+    cxstring s1 = CX_STR("1234");
+    cxstring s2 = CX_STR(".:.:.");
+    cxstring s3 = CX_STR("X");
+    CX_TEST_DO {
+        size_t len0 = cx_strlen(0);
+        size_t len1 = cx_strlen(1, s1);
+        size_t len2 = cx_strlen(2, s1, s2);
+        size_t len3 = cx_strlen(3, s1, s2, s3);
+
+        CX_TEST_ASSERT(len0 == 0);
+        CX_TEST_ASSERT(len1 == 4);
+        CX_TEST_ASSERT(len2 == 9);
+        CX_TEST_ASSERT(len3 == 10);
+    }
+}
+
+CX_TEST(test_strsubs) {
+    cxstring str = CX_STR("A test string");
+
+    CX_TEST_DO {
+        cxstring sub = cx_strsubs(str, 0);
+        CX_TEST_ASSERT(0 == cx_strcmp(sub, str));
+
+        sub = cx_strsubs(str, 2);
+        CX_TEST_ASSERT(0 == cx_strcmp(sub, CX_STR("test string")));
+
+        sub = cx_strsubs(str, 7);
+        CX_TEST_ASSERT(0 == cx_strcmp(sub, CX_STR("string")));
+
+        sub = cx_strsubs(str, 15);
+        CX_TEST_ASSERT(0 == cx_strcmp(sub, CX_STR("")));
+
+        sub = cx_strsubsl(str, 2, 4);
+        CX_TEST_ASSERT(0 == cx_strcmp(sub, CX_STR("test")));
+
+        sub = cx_strsubsl(str, 7, 3);
+        CX_TEST_ASSERT(0 == cx_strcmp(sub, CX_STR("str")));
+
+        sub = cx_strsubsl(str, 7, 20);
+        CX_TEST_ASSERT(0 == cx_strcmp(sub, CX_STR("string")));
+
+        // just for coverage, call the _m variant
+        cxmutstr m = cx_strsubs_m(cx_mutstrn(NULL, 0), 0);
+        CX_TEST_ASSERT(0 == cx_strcmp(cx_strcast(m), CX_STR("")));
+    }
+}
+
+CX_TEST(test_strchr) {
+    cxstring str = CX_STR("I will find you - and I will kill you");
+
+    CX_TEST_DO {
+        cxstring notfound = cx_strchr(str, 'x');
+        CX_TEST_ASSERT(notfound.length == 0);
+
+        cxstring result = cx_strchr(str, 'w');
+        CX_TEST_ASSERT(result.length == 35);
+        CX_TEST_ASSERT(0 == strcmp(result.ptr, "will find you - and I will kill you"));
+
+        // just for coverage, call the _m variant
+        cxmutstr m = cx_strchr_m(cx_mutstrn(NULL, 0), 'a');
+        CX_TEST_ASSERT(0 == cx_strcmp(cx_strcast(m), CX_STR("")));
+    }
+}
+
+CX_TEST(test_strrchr) {
+    cxstring str = CX_STR("I will find you - and I will kill you");
+
+    CX_TEST_DO {
+        cxstring notfound = cx_strrchr(str, 'x');
+        CX_TEST_ASSERT(notfound.length == 0);
+
+        cxstring result = cx_strrchr(str, 'w');
+        CX_TEST_ASSERT(result.length == 13);
+        CX_TEST_ASSERT(0 == strcmp(result.ptr, "will kill you"));
+
+        // just for coverage, call the _m variant
+        cxmutstr m = cx_strrchr_m(cx_mutstrn(NULL, 0), 'a');
+        CX_TEST_ASSERT(0 == cx_strcmp(cx_strcast(m), CX_STR("")));
+    }
+}
+
+CX_TEST(test_strstr) {
+    cxstring str = CX_STR("find the match in this string");
+    cxstring longstr = CX_STR(
+            "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkl"
+            "mnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwx"
+            "yzabcdeababababnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghij"
+            "klmnopqrstuvwxyzaababababababababrstuvwxyzabcdefghijklmnopqrstuv"
+            "abababababababababababababababababababababababababababababababab"
+            "abababababababababababababababababababababababababababababababab"
+            "abababababababababababababababababababababababababababababababab"
+            "abababababababababababababababababababababababababababababababab"
+            "abababababababababababababababababababababababababababababababab"
+            "abababababababababababababababababababababababababababababababab"
+            "wxyz1234567890");
+    cxstring longstrpattern = CX_STR(
+            "abababababababababababababababababababababababababababababababab"
+            "abababababababababababababababababababababababababababababababab"
+            "abababababababababababababababababababababababababababababababab"
+            "abababababababababababababababababababababababababababababababab"
+            "abababababababababababababababababababababababababababababababab"
+    );
+    cxstring longstrresult = CX_STR(
+            "abababababababababababababababababababababababababababababababab"
+            "abababababababababababababababababababababababababababababababab"
+            "abababababababababababababababababababababababababababababababab"
+            "abababababababababababababababababababababababababababababababab"
+            "abababababababababababababababababababababababababababababababab"
+            "abababababababababababababababababababababababababababababababab"
+            "wxyz1234567890"
+    );
+
+    CX_TEST_DO {
+        cxstring notfound = cx_strstr(str, CX_STR("no match"));
+        CX_TEST_ASSERT(notfound.length == 0);
+
+        cxstring result = cx_strstr(str, CX_STR("match"));
+        CX_TEST_ASSERT(result.length == 20);
+        CX_TEST_ASSERT(0 == strcmp(result.ptr, "match in this string"));
+
+        result = cx_strstr(str, CX_STR(""));
+        CX_TEST_ASSERT(result.length == str.length);
+        CX_TEST_ASSERT(0 == strcmp(result.ptr, str.ptr));
+
+        result = cx_strstr(longstr, longstrpattern);
+        CX_TEST_ASSERT(result.length == longstrresult.length);
+        CX_TEST_ASSERT(0 == strcmp(result.ptr, longstrresult.ptr));
+
+        // just for coverage, call the _m variant
+        cxmutstr mstr = cx_strdup(longstr);
+        cxmutstr m = cx_strstr_m(mstr, longstrpattern);
+        CX_TEST_ASSERT(m.length == longstrresult.length);
+        CX_TEST_ASSERT(0 == strcmp(m.ptr, longstrresult.ptr));
+        cx_strfree(&mstr);
+    }
+}
+
+CX_TEST(test_strcmp) {
+    cxstring str = CX_STR("compare this");
+    CX_TEST_DO {
+        CX_TEST_ASSERT(0 == cx_strcmp(CX_STR(""), CX_STR("")));
+        CX_TEST_ASSERT(0 < cx_strcmp(str, CX_STR("")));
+        CX_TEST_ASSERT(0 == cx_strcmp(str, CX_STR("compare this")));
+        CX_TEST_ASSERT(0 != cx_strcmp(str, CX_STR("Compare This")));
+        CX_TEST_ASSERT(0 > cx_strcmp(str, CX_STR("compare tool")));
+        CX_TEST_ASSERT(0 < cx_strcmp(str, CX_STR("compare shit")));
+        CX_TEST_ASSERT(0 > cx_strcmp(str, CX_STR("compare this not")));
+        CX_TEST_ASSERT(0 < cx_strcmp(str, CX_STR("compare")));
+
+        cxstring str2 = CX_STR("Compare This");
+        CX_TEST_ASSERT(0 != cx_strcmp_p(&str, &str2));
+        str2 = CX_STR("compare this");
+        CX_TEST_ASSERT(0 == cx_strcmp_p(&str, &str2));
+    }
+}
+
+CX_TEST(test_strcasecmp) {
+    cxstring str = CX_STR("compare this");
+    CX_TEST_DO {
+        CX_TEST_ASSERT(0 == cx_strcasecmp(CX_STR(""), CX_STR("")));
+        CX_TEST_ASSERT(0 < cx_strcasecmp(str, CX_STR("")));
+        CX_TEST_ASSERT(0 == cx_strcasecmp(str, CX_STR("compare this")));
+        CX_TEST_ASSERT(0 == cx_strcasecmp(str, CX_STR("Compare This")));
+        CX_TEST_ASSERT(0 > cx_strcasecmp(str, CX_STR("compare tool")));
+        CX_TEST_ASSERT(0 < cx_strcasecmp(str, CX_STR("compare shit")));
+        CX_TEST_ASSERT(0 > cx_strcasecmp(str, CX_STR("compare this not")));
+        CX_TEST_ASSERT(0 < cx_strcasecmp(str, CX_STR("compare")));
+
+        cxstring str2 = CX_STR("Compare This");
+        CX_TEST_ASSERT(0 == cx_strcasecmp_p(&str, &str2));
+        str2 = CX_STR("Compare Tool");
+        CX_TEST_ASSERT(0 > cx_strcasecmp_p(&str, &str2));
+    }
+}
+
+CX_TEST(test_strcat) {
+    cxstring s1 = CX_STR("12");
+    cxstring s2 = CX_STR("34");
+    cxstring s3 = CX_STR("56");
+    cxstring sn = {NULL, 0};
+
+    CxTestingAllocator talloc;
+    cx_testing_allocator_init(&talloc);
+    CxAllocator *alloc = &talloc.base;
+
+    CX_TEST_DO {
+        cxmutstr t1 = cx_strcat_a(alloc, 2, s1, s2);
+        CX_TEST_ASSERT(0 == cx_strcmp(cx_strcast(t1), CX_STR("1234")));
+        ASSERT_ZERO_TERMINATED(t1);
+        cx_strfree_a(alloc, &t1);
+
+        cxmutstr t2 = cx_strcat_a(alloc, 3, s1, s2, s3);
+        CX_TEST_ASSERT(0 == cx_strcmp(cx_strcast(t2), CX_STR("123456")));
+        ASSERT_ZERO_TERMINATED(t2);
+        cx_strfree_a(alloc, &t2);
+
+        cxmutstr t3 = cx_strcat_a(alloc, 6, s1, sn, s2, sn, s3, sn);
+        CX_TEST_ASSERT(0 == cx_strcmp(cx_strcast(t3), CX_STR("123456")));
+        ASSERT_ZERO_TERMINATED(t3);
+        cx_strfree_a(alloc, &t3);
+
+        cxmutstr t4 = cx_strcat_a(alloc, 2, sn, sn);
+        CX_TEST_ASSERT(0 == cx_strcmp(cx_strcast(t4), CX_STR("")));
+        ASSERT_ZERO_TERMINATED(t4);
+        cx_strfree_a(alloc, &t4);
+
+        CX_TEST_ASSERT(cx_testing_allocator_verify(&talloc));
+
+        // use the macro
+        cxmutstr t5 = cx_strcat(3, s3, s1, s2);
+        CX_TEST_ASSERT(0 == cx_strcmp(cx_strcast(t5), CX_STR("561234")));
+        ASSERT_ZERO_TERMINATED(t5);
+        cx_strfree(&t5);
+
+        // use an initial string
+        cxmutstr t6 = cx_strdup(CX_STR("Hello"));
+        t6 = cx_strcat_m(t6, 2, CX_STR(", "), CX_STR("World!"));
+        CX_TEST_ASSERT(0 == cx_strcmp(cx_strcast(t6), CX_STR("Hello, World!")));
+        ASSERT_ZERO_TERMINATED(t6);
+        cx_strfree(&t6);
+    }
+    cx_testing_allocator_destroy(&talloc);
+}
+
+CX_TEST(test_strsplit) {
+    cxstring test = CX_STR("this,is,a,csv,string");
+    size_t capa = 8;
+    cxstring list[8];
+    size_t n;
+    CX_TEST_DO {
+        // special case: empty string
+        n = cx_strsplit(test, CX_STR(""), capa, list);
+        CX_TEST_ASSERT(n == 1);
+        CX_TEST_ASSERT(0 == cx_strcmp(list[0], test));
+
+        // no delimiter occurrence
+        n = cx_strsplit(test, CX_STR("z"), capa, list);
+        CX_TEST_ASSERT(n == 1);
+        CX_TEST_ASSERT(0 == cx_strcmp(list[0], test));
+
+        // partially matching delimiter
+        n = cx_strsplit(test, CX_STR("is,not"), capa, list);
+        CX_TEST_ASSERT(n == 1);
+        CX_TEST_ASSERT(0 == cx_strcmp(list[0], test));
+
+        // matching single-char delimiter
+        n = cx_strsplit(test, CX_STR(","), capa, list);
+        CX_TEST_ASSERT(n == 5);
+        CX_TEST_ASSERT(0 == cx_strcmp(list[0], CX_STR("this")));
+        CX_TEST_ASSERT(0 == cx_strcmp(list[1], CX_STR("is")));
+        CX_TEST_ASSERT(0 == cx_strcmp(list[2], CX_STR("a")));
+        CX_TEST_ASSERT(0 == cx_strcmp(list[3], CX_STR("csv")));
+        CX_TEST_ASSERT(0 == cx_strcmp(list[4], CX_STR("string")));
+
+        // matching multi-char delimiter
+        n = cx_strsplit(test, CX_STR("is"), capa, list);
+        CX_TEST_ASSERT(n == 3);
+        CX_TEST_ASSERT(0 == cx_strcmp(list[0], CX_STR("th")));
+        CX_TEST_ASSERT(0 == cx_strcmp(list[1], CX_STR(",")));
+        CX_TEST_ASSERT(0 == cx_strcmp(list[2], CX_STR(",a,csv,string")));
+
+        // bounded list using single-char delimiter
+        n = cx_strsplit(test, CX_STR(","), 3, list);
+        CX_TEST_ASSERT(n == 3);
+        CX_TEST_ASSERT(0 == cx_strcmp(list[0], CX_STR("this")));
+        CX_TEST_ASSERT(0 == cx_strcmp(list[1], CX_STR("is")));
+        CX_TEST_ASSERT(0 == cx_strcmp(list[2], CX_STR("a,csv,string")));
+
+        // bounded list using multi-char delimiter
+        n = cx_strsplit(test, CX_STR("is"), 2, list);
+        CX_TEST_ASSERT(n == 2);
+        CX_TEST_ASSERT(0 == cx_strcmp(list[0], CX_STR("th")));
+        CX_TEST_ASSERT(0 == cx_strcmp(list[1], CX_STR(",is,a,csv,string")));
+
+        // start with delimiter
+        n = cx_strsplit(test, CX_STR("this"), capa, list);
+        CX_TEST_ASSERT(n == 2);
+        CX_TEST_ASSERT(0 == cx_strcmp(list[0], CX_STR("")));
+        CX_TEST_ASSERT(0 == cx_strcmp(list[1], CX_STR(",is,a,csv,string")));
+
+        // end with delimiter
+        n = cx_strsplit(test, CX_STR("string"), capa, list);
+        CX_TEST_ASSERT(n == 2);
+        CX_TEST_ASSERT(0 == cx_strcmp(list[0], CX_STR("this,is,a,csv,")));
+        CX_TEST_ASSERT(0 == cx_strcmp(list[1], CX_STR("")));
+
+
+        // end with delimiter exceed bound
+        n = cx_strsplit(CX_STR("a,b,c,"), CX_STR(","), 3, list);
+        CX_TEST_ASSERT(n == 3);
+        CX_TEST_ASSERT(0 == cx_strcmp(list[0], CX_STR("a")));
+        CX_TEST_ASSERT(0 == cx_strcmp(list[1], CX_STR("b")));
+        CX_TEST_ASSERT(0 == cx_strcmp(list[2], CX_STR("c,")));
+
+        // exact match
+        n = cx_strsplit(test, CX_STR("this,is,a,csv,string"), capa, list);
+        CX_TEST_ASSERT(n == 2);
+        CX_TEST_ASSERT(0 == cx_strcmp(list[0], CX_STR("")));
+        CX_TEST_ASSERT(0 == cx_strcmp(list[1], CX_STR("")));
+
+        // string to be split is only substring
+        n = cx_strsplit(test, CX_STR("this,is,a,csv,string,with,extension"), capa, list);
+        CX_TEST_ASSERT(n == 1);
+        CX_TEST_ASSERT(0 == cx_strcmp(list[0], test));
+
+        // subsequent encounter of delimiter (the string between is empty)
+        n = cx_strsplit(test, CX_STR("is,"), capa, list);
+        CX_TEST_ASSERT(n == 3);
+        CX_TEST_ASSERT(0 == cx_strcmp(list[0], CX_STR("th")));
+        CX_TEST_ASSERT(0 == cx_strcmp(list[1], CX_STR("")));
+        CX_TEST_ASSERT(0 == cx_strcmp(list[2], CX_STR("a,csv,string")));
+
+        // call the _m variant just for coverage
+        cxmutstr mtest = cx_strdup(test);
+        cxmutstr mlist[4];
+        n = cx_strsplit_m(mtest, CX_STR("is,"), 4, mlist);
+        CX_TEST_ASSERT(n == 3);
+        CX_TEST_ASSERT(0 == cx_strcmp(cx_strcast(mlist[0]), CX_STR("th")));
+        CX_TEST_ASSERT(0 == cx_strcmp(cx_strcast(mlist[1]), CX_STR("")));
+        CX_TEST_ASSERT(0 == cx_strcmp(cx_strcast(mlist[2]), CX_STR("a,csv,string")));
+        cx_strfree(&mtest);
+    }
+}
+
+CX_TEST(test_strsplit_a) {
+    CxTestingAllocator talloc;
+    cx_testing_allocator_init(&talloc);
+    CxAllocator *alloc = &talloc.base;
+
+    cxstring test = CX_STR("this,is,a,csv,string");
+    size_t capa = 8;
+    cxstring *list;
+    size_t n;
+    CX_TEST_DO {
+        // special case: empty string
+        n = cx_strsplit_a(alloc, test, CX_STR(""), capa, &list);
+        CX_TEST_ASSERT(n == 1);
+        CX_TEST_ASSERT(0 == cx_strcmp(list[0], test));
+        cxFree(alloc, list);
+
+        // no delimiter occurrence
+        n = cx_strsplit_a(alloc, test, CX_STR("z"), capa, &list);
+        CX_TEST_ASSERT(n == 1);
+        CX_TEST_ASSERT(0 == cx_strcmp(list[0], test));
+        cxFree(alloc, list);
+
+        // partially matching delimiter
+        n = cx_strsplit_a(alloc, test, CX_STR("is,not"), capa, &list);
+        CX_TEST_ASSERT(n == 1);
+        CX_TEST_ASSERT(0 == cx_strcmp(list[0], test));
+        cxFree(alloc, list);
+
+        // matching single-char delimiter
+        n = cx_strsplit_a(alloc, test, CX_STR(","), capa, &list);
+        CX_TEST_ASSERT(n == 5);
+        CX_TEST_ASSERT(0 == cx_strcmp(list[0], CX_STR("this")));
+        CX_TEST_ASSERT(0 == cx_strcmp(list[1], CX_STR("is")));
+        CX_TEST_ASSERT(0 == cx_strcmp(list[2], CX_STR("a")));
+        CX_TEST_ASSERT(0 == cx_strcmp(list[3], CX_STR("csv")));
+        CX_TEST_ASSERT(0 == cx_strcmp(list[4], CX_STR("string")));
+        cxFree(alloc, list);
+
+        // matching multi-char delimiter
+        n = cx_strsplit_a(alloc, test, CX_STR("is"), capa, &list);
+        CX_TEST_ASSERT(n == 3);
+        CX_TEST_ASSERT(0 == cx_strcmp(list[0], CX_STR("th")));
+        CX_TEST_ASSERT(0 == cx_strcmp(list[1], CX_STR(",")));
+        CX_TEST_ASSERT(0 == cx_strcmp(list[2], CX_STR(",a,csv,string")));
+        cxFree(alloc, list);
+
+        // bounded list using single-char delimiter
+        n = cx_strsplit_a(alloc, test, CX_STR(","), 3, &list);
+        CX_TEST_ASSERT(n == 3);
+        CX_TEST_ASSERT(0 == cx_strcmp(list[0], CX_STR("this")));
+        CX_TEST_ASSERT(0 == cx_strcmp(list[1], CX_STR("is")));
+        CX_TEST_ASSERT(0 == cx_strcmp(list[2], CX_STR("a,csv,string")));
+        cxFree(alloc, list);
+
+        // bounded list using multi-char delimiter
+        n = cx_strsplit_a(alloc, test, CX_STR("is"), 2, &list);
+        CX_TEST_ASSERT(n == 2);
+        CX_TEST_ASSERT(0 == cx_strcmp(list[0], CX_STR("th")));
+        CX_TEST_ASSERT(0 == cx_strcmp(list[1], CX_STR(",is,a,csv,string")));
+        cxFree(alloc, list);
+
+        // start with delimiter
+        n = cx_strsplit_a(alloc, test, CX_STR("this"), capa, &list);
+        CX_TEST_ASSERT(n == 2);
+        CX_TEST_ASSERT(0 == cx_strcmp(list[0], CX_STR("")));
+        CX_TEST_ASSERT(0 == cx_strcmp(list[1], CX_STR(",is,a,csv,string")));
+        cxFree(alloc, list);
+
+        // end with delimiter
+        n = cx_strsplit_a(alloc, test, CX_STR("string"), capa, &list);
+        CX_TEST_ASSERT(n == 2);
+        CX_TEST_ASSERT(0 == cx_strcmp(list[0], CX_STR("this,is,a,csv,")));
+        CX_TEST_ASSERT(0 == cx_strcmp(list[1], CX_STR("")));
+        cxFree(alloc, list);
+
+        // end with delimiter exceed bound
+        n = cx_strsplit_a(alloc, CX_STR("a,b,c,"), CX_STR(","), 3, &list);
+        CX_TEST_ASSERT(n == 3);
+        CX_TEST_ASSERT(0 == cx_strcmp(list[0], CX_STR("a")));
+        CX_TEST_ASSERT(0 == cx_strcmp(list[1], CX_STR("b")));
+        CX_TEST_ASSERT(0 == cx_strcmp(list[2], CX_STR("c,")));
+        cxFree(alloc, list);
+
+        // exact match
+        n = cx_strsplit_a(alloc, test, CX_STR("this,is,a,csv,string"), capa, &list);
+        CX_TEST_ASSERT(n == 2);
+        CX_TEST_ASSERT(0 == cx_strcmp(list[0], CX_STR("")));
+        CX_TEST_ASSERT(0 == cx_strcmp(list[1], CX_STR("")));
+        cxFree(alloc, list);
+
+        // string to be split is only substring
+        n = cx_strsplit_a(alloc, test, CX_STR("this,is,a,csv,string,with,extension"), capa, &list);
+        CX_TEST_ASSERT(n == 1);
+        CX_TEST_ASSERT(0 == cx_strcmp(list[0], test));
+        cxFree(alloc, list);
+
+        // subsequent encounter of delimiter (the string between is empty)
+        n = cx_strsplit_a(alloc, test, CX_STR("is,"), capa, &list);
+        CX_TEST_ASSERT(n == 3);
+        CX_TEST_ASSERT(0 == cx_strcmp(list[0], CX_STR("th")));
+        CX_TEST_ASSERT(0 == cx_strcmp(list[1], CX_STR("")));
+        CX_TEST_ASSERT(0 == cx_strcmp(list[2], CX_STR("a,csv,string")));
+        cxFree(alloc, list);
+
+        // call the _m variant just for coverage
+        cxmutstr mtest = cx_strdup(test);
+        cxmutstr *mlist;
+        n = cx_strsplit_ma(alloc, mtest, CX_STR("is,"), 4, &mlist);
+        CX_TEST_ASSERT(n == 3);
+        CX_TEST_ASSERT(0 == cx_strcmp(cx_strcast(mlist[0]), CX_STR("th")));
+        CX_TEST_ASSERT(0 == cx_strcmp(cx_strcast(mlist[1]), CX_STR("")));
+        CX_TEST_ASSERT(0 == cx_strcmp(cx_strcast(mlist[2]), CX_STR("a,csv,string")));
+        cxFree(alloc, mlist);
+        cx_strfree(&mtest);
+
+        CX_TEST_ASSERT(cx_testing_allocator_verify(&talloc));
+    }
+    cx_testing_allocator_destroy(&talloc);
+}
+
+CX_TEST(test_strtrim) {
+    cxstring t1 = cx_strtrim(CX_STR("  ein test  \t "));
+    cxstring t2 = cx_strtrim(CX_STR("abc"));
+    cxstring t3 = cx_strtrim(CX_STR(" 123"));
+    cxstring t4 = cx_strtrim(CX_STR("xyz "));
+    cxstring t5 = cx_strtrim(CX_STR("   "));
+    cxstring empty = cx_strtrim(CX_STR(""));
+
+    CX_TEST_DO {
+        CX_TEST_ASSERT(0 == cx_strcmp(t1, CX_STR("ein test")));
+        CX_TEST_ASSERT(0 == cx_strcmp(t2, CX_STR("abc")));
+        CX_TEST_ASSERT(0 == cx_strcmp(t3, CX_STR("123")));
+        CX_TEST_ASSERT(0 == cx_strcmp(t4, CX_STR("xyz")));
+        CX_TEST_ASSERT(0 == cx_strcmp(t5, CX_STR("")));
+        CX_TEST_ASSERT(0 == cx_strcmp(empty, CX_STR("")));
+
+        // call the _m variant just for coverage
+        cxmutstr m1 = cx_strtrim_m(cx_mutstr((char *) "  ein test  \t "));
+        CX_TEST_ASSERT(0 == cx_strcmp(cx_strcast(m1), CX_STR("ein test")));
+    }
+}
+
+CX_TEST(test_strprefix) {
+    cxstring str = CX_STR("test my prefix and my suffix");
+    cxstring empty = CX_STR("");
+    CX_TEST_DO {
+        CX_TEST_ASSERT(!cx_strprefix(empty, CX_STR("pref")));
+        CX_TEST_ASSERT(cx_strprefix(str, empty));
+        CX_TEST_ASSERT(cx_strprefix(empty, empty));
+        CX_TEST_ASSERT(cx_strprefix(str, CX_STR("test ")));
+        CX_TEST_ASSERT(!cx_strprefix(str, CX_STR("8-) fsck ")));
+    }
+}
+
+CX_TEST(test_strsuffix) {
+    cxstring str = CX_STR("test my prefix and my suffix");
+    cxstring empty = CX_STR("");
+    CX_TEST_DO {
+        CX_TEST_ASSERT(!cx_strsuffix(empty, CX_STR("suf")));
+        CX_TEST_ASSERT(cx_strsuffix(str, empty));
+        CX_TEST_ASSERT(cx_strsuffix(empty, empty));
+        CX_TEST_ASSERT(cx_strsuffix(str, CX_STR("fix")));
+        CX_TEST_ASSERT(!cx_strsuffix(str, CX_STR("fox")));
+    }
+}
+
+CX_TEST(test_strcaseprefix) {
+    cxstring str = CX_STR("test my prefix and my suffix");
+    cxstring empty = CX_STR("");
+    CX_TEST_DO {
+        CX_TEST_ASSERT(!cx_strcaseprefix(empty, CX_STR("pREf")));
+        CX_TEST_ASSERT(cx_strcaseprefix(str, empty));
+        CX_TEST_ASSERT(cx_strcaseprefix(empty, empty));
+        CX_TEST_ASSERT(cx_strcaseprefix(str, CX_STR("TEST ")));
+        CX_TEST_ASSERT(!cx_strcaseprefix(str, CX_STR("8-) fsck ")));
+    }
+}
+
+CX_TEST(test_strcasesuffix) {
+    cxstring str = CX_STR("test my prefix and my suffix");
+    cxstring empty = CX_STR("");
+    CX_TEST_DO {
+        CX_TEST_ASSERT(!cx_strcasesuffix(empty, CX_STR("sUf")));
+        CX_TEST_ASSERT(cx_strcasesuffix(str, empty));
+        CX_TEST_ASSERT(cx_strcasesuffix(empty, empty));
+        CX_TEST_ASSERT(cx_strcasesuffix(str, CX_STR("FIX")));
+        CX_TEST_ASSERT(!cx_strcasesuffix(str, CX_STR("fox")));
+    }
+}
+
+CX_TEST(test_strreplace) {
+    CxTestingAllocator talloc;
+    cx_testing_allocator_init(&talloc);
+    CxAllocator *alloc = &talloc.base;
+
+    cxstring str = CX_STR("test ababab string aba");
+    cxstring longstr = CX_STR(
+            "xyaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaacd");
+    cxstring notrail = CX_STR("test abab");
+    cxstring empty = CX_STR("");
+    cxstring astr = CX_STR("aaaaaaaaaa");
+    cxstring csstr = CX_STR("test AB ab TEST xyz");
+
+    cxmutstr repl = cx_strreplace(str, CX_STR("abab"), CX_STR("muchlonger"));
+    char const *expected = "test muchlongerab string aba";
+
+    cxmutstr repln = cx_strreplacen(str, CX_STR("ab"), CX_STR("c"), 2);
+    char const *expectedn = "test ccab string aba";
+
+    cxmutstr longrepl = cx_strreplace(longstr, CX_STR("a"), CX_STR("z"));
+    char const *longexpect = "xyzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzcd";
+
+    cxmutstr replnotrail = cx_strreplace(notrail, CX_STR("ab"), CX_STR("z"));
+    char const *notrailexpect = "test zz";
+
+    cxmutstr repleq = cx_strreplace(str, str, CX_STR("hello"));
+    char const *eqexpect = "hello";
+
+    cxmutstr replempty1 = cx_strreplace(empty, CX_STR("ab"), CX_STR("c")); // expect: empty
+    cxmutstr replempty2 = cx_strreplace(str, CX_STR("abab"), empty);
+    char const *emptyexpect2 = "test ab string aba";
+
+    cxmutstr replpre = cx_strreplace(str, CX_STR("test "), CX_STR("TEST "));
+    char const *preexpected = "TEST ababab string aba";
+
+    cxmutstr replan1 = cx_strreplacen(astr, CX_STR("a"), CX_STR("x"), 1);
+    char const *an1expected = "xaaaaaaaaa";
+
+    cxmutstr replan4 = cx_strreplacen(astr, CX_STR("a"), CX_STR("x"), 4);
+    char const *an4expected = "xxxxaaaaaa";
+
+    cxmutstr replan9 = cx_strreplacen(astr, CX_STR("a"), CX_STR("x"), 9);
+    char const *an9expected = "xxxxxxxxxa";
+
+    cxmutstr replan10 = cx_strreplacen(astr, CX_STR("a"), CX_STR("x"), 10);
+    char const *an10expected = "xxxxxxxxxx";
+
+    CX_TEST_DO {
+        cxmutstr repl1_a = cx_strreplace_a(alloc, csstr, CX_STR("AB"), CX_STR("*"));
+        char const *expeced1_a = "test * ab TEST xyz";
+
+        cxmutstr repl2_a = cx_strreplace_a(alloc, csstr, CX_STR("test"), CX_STR("TEST"));
+        char const *expected2_a = "TEST AB ab TEST xyz";
+
+        CX_TEST_ASSERT(repl.ptr != str.ptr);
+        ASSERT_ZERO_TERMINATED(repl);
+        CX_TEST_ASSERT(0 == strcmp(repl.ptr, expected));
+        ASSERT_ZERO_TERMINATED(repln);
+        CX_TEST_ASSERT(0 == strcmp(repln.ptr, expectedn));
+        ASSERT_ZERO_TERMINATED(longrepl);
+        CX_TEST_ASSERT(0 == strcmp(longrepl.ptr, longexpect));
+        ASSERT_ZERO_TERMINATED(replnotrail);
+        CX_TEST_ASSERT(0 == strcmp(replnotrail.ptr, notrailexpect));
+        ASSERT_ZERO_TERMINATED(repleq);
+        CX_TEST_ASSERT(0 == strcmp(repleq.ptr, eqexpect));
+        ASSERT_ZERO_TERMINATED(replempty1);
+        CX_TEST_ASSERT(0 == strcmp(replempty1.ptr, ""));
+        ASSERT_ZERO_TERMINATED(replempty2);
+        CX_TEST_ASSERT(0 == strcmp(replempty2.ptr, emptyexpect2));
+        ASSERT_ZERO_TERMINATED(replpre);
+        CX_TEST_ASSERT(0 == strcmp(replpre.ptr, preexpected));
+        ASSERT_ZERO_TERMINATED(replan1);
+        CX_TEST_ASSERT(0 == strcmp(replan1.ptr, an1expected));
+        ASSERT_ZERO_TERMINATED(replan4);
+        CX_TEST_ASSERT(0 == strcmp(replan4.ptr, an4expected));
+        ASSERT_ZERO_TERMINATED(replan9);
+        CX_TEST_ASSERT(0 == strcmp(replan9.ptr, an9expected));
+        ASSERT_ZERO_TERMINATED(replan10);
+        CX_TEST_ASSERT(0 == strcmp(replan10.ptr, an10expected));
+        ASSERT_ZERO_TERMINATED(repl1_a);
+        CX_TEST_ASSERT(0 == strcmp(repl1_a.ptr, expeced1_a));
+        ASSERT_ZERO_TERMINATED(repl2_a);
+        CX_TEST_ASSERT(0 == strcmp(repl2_a.ptr, expected2_a));
+
+        cx_strfree_a(alloc, &repl1_a);
+        cx_strfree_a(alloc, &repl2_a);
+        CX_TEST_ASSERT(cx_testing_allocator_verify(&talloc));
+    }
+
+    cx_strfree(&repl);
+    cx_strfree(&repln);
+    cx_strfree(&longrepl);
+    cx_strfree(&replnotrail);
+    cx_strfree(&repleq);
+    cx_strfree(&replempty1);
+    cx_strfree(&replempty2);
+    cx_strfree(&replpre);
+    cx_strfree(&replan1);
+    cx_strfree(&replan4);
+    cx_strfree(&replan9);
+    cx_strfree(&replan10);
+    cx_testing_allocator_destroy(&talloc);
+}
+
+CX_TEST(test_strupper) {
+    cxmutstr str = cx_strdup(CX_STR("thIs 1s @ Te$t"));
+    CX_TEST_DO {
+        cx_strupper(str);
+        CX_TEST_ASSERT(0 == strcmp(str.ptr, "THIS 1S @ TE$T"));
+    }
+    cx_strfree(&str);
+}
+
+CX_TEST(test_strlower) {
+    cxmutstr str = cx_strdup(CX_STR("thIs 1s @ Te$t"));
+    CX_TEST_DO {
+        cx_strlower(str);
+        CX_TEST_ASSERT(0 == strcmp(str.ptr, "this 1s @ te$t"));
+    }
+    cx_strfree(&str);
+}
+
+CX_TEST(test_strtok) {
+    cxstring str = CX_STR("a,comma,separated,string");
+    cxstring delim = CX_STR(",");
+    CX_TEST_DO {
+        CxStrtokCtx ctx = cx_strtok(str, delim, 3);
+        CX_TEST_ASSERT(ctx.str.ptr == str.ptr);
+        CX_TEST_ASSERT(ctx.str.length == str.length);
+        CX_TEST_ASSERT(ctx.delim.ptr == delim.ptr);
+        CX_TEST_ASSERT(ctx.delim.length == delim.length);
+        CX_TEST_ASSERT(ctx.limit == 3);
+        CX_TEST_ASSERT(ctx.found == 0);
+        CX_TEST_ASSERT(ctx.pos == 0);
+        CX_TEST_ASSERT(ctx.next_pos == 0);
+        CX_TEST_ASSERT(ctx.delim_more == NULL);
+        CX_TEST_ASSERT(ctx.delim_more_count == 0);
+    }
+}
+
+CX_TEST(test_strtok_m) {
+    cxmutstr str = cx_strdup(CX_STR("a,comma,separated,string"));
+    cxstring delim = CX_STR(",");
+    CX_TEST_DO {
+        CxStrtokCtx ctx = cx_strtok_m(str, delim, 3);
+        CX_TEST_ASSERT(ctx.str.ptr == str.ptr);
+        CX_TEST_ASSERT(ctx.str.length == str.length);
+        CX_TEST_ASSERT(ctx.delim.ptr == delim.ptr);
+        CX_TEST_ASSERT(ctx.delim.length == delim.length);
+        CX_TEST_ASSERT(ctx.limit == 3);
+        CX_TEST_ASSERT(ctx.found == 0);
+        CX_TEST_ASSERT(ctx.pos == 0);
+        CX_TEST_ASSERT(ctx.next_pos == 0);
+        CX_TEST_ASSERT(ctx.delim_more == NULL);
+        CX_TEST_ASSERT(ctx.delim_more_count == 0);
+    }
+    cx_strfree(&str);
+}
+
+CX_TEST(test_strtok_delim) {
+    cxstring str = CX_STR("an,arbitrarily|separated;string");
+    cxstring delim = CX_STR(",");
+    cxstring delim_more[2] = {CX_STR("|"), CX_STR(";")};
+    CX_TEST_DO {
+        CxStrtokCtx ctx = cx_strtok(str, delim, 3);
+        cx_strtok_delim(&ctx, delim_more, 2);
+        CX_TEST_ASSERT(ctx.str.ptr == str.ptr);
+        CX_TEST_ASSERT(ctx.str.length == str.length);
+        CX_TEST_ASSERT(ctx.delim.ptr == delim.ptr);
+        CX_TEST_ASSERT(ctx.delim.length == delim.length);
+        CX_TEST_ASSERT(ctx.limit == 3);
+        CX_TEST_ASSERT(ctx.found == 0);
+        CX_TEST_ASSERT(ctx.pos == 0);
+        CX_TEST_ASSERT(ctx.next_pos == 0);
+        CX_TEST_ASSERT(ctx.delim_more == delim_more);
+        CX_TEST_ASSERT(ctx.delim_more_count == 2);
+    }
+}
+
+CX_TEST(test_strtok_next_easy) {
+    cxstring str = CX_STR("a,comma,separated,string");
+    cxstring delim = CX_STR(",");
+    CX_TEST_DO {
+        CxStrtokCtx ctx = cx_strtok(str, delim, 3);
+        bool ret;
+        cxstring tok;
+
+        ret = cx_strtok_next(&ctx, &tok);
+        CX_TEST_ASSERT(ret);
+        CX_TEST_ASSERT(0 == cx_strcmp(tok, CX_STR("a")));
+        CX_TEST_ASSERT(ctx.pos == 0);
+        CX_TEST_ASSERT(ctx.next_pos == 2);
+        CX_TEST_ASSERT(ctx.delim_pos == 1);
+        CX_TEST_ASSERT(ctx.found == 1);
+
+        ret = cx_strtok_next(&ctx, &tok);
+        CX_TEST_ASSERT(ret);
+        CX_TEST_ASSERT(0 == cx_strcmp(tok, CX_STR("comma")));
+        CX_TEST_ASSERT(ctx.pos == 2);
+        CX_TEST_ASSERT(ctx.next_pos == 8);
+        CX_TEST_ASSERT(ctx.delim_pos == 7);
+        CX_TEST_ASSERT(ctx.found == 2);
+
+        ret = cx_strtok_next(&ctx, &tok);
+        CX_TEST_ASSERT(ret);
+        CX_TEST_ASSERT(0 == cx_strcmp(tok, CX_STR("separated")));
+        CX_TEST_ASSERT(ctx.pos == 8);
+        CX_TEST_ASSERT(ctx.next_pos == 18);
+        CX_TEST_ASSERT(ctx.delim_pos == 17);
+        CX_TEST_ASSERT(ctx.found == 3);
+
+        ret = cx_strtok_next(&ctx, &tok);
+        CX_TEST_ASSERT(!ret);
+        CX_TEST_ASSERT(ctx.pos == 8);
+        CX_TEST_ASSERT(ctx.next_pos == 18);
+        CX_TEST_ASSERT(ctx.delim_pos == 17);
+        CX_TEST_ASSERT(ctx.found == 3);
+    }
+}
+
+CX_TEST(test_strtok_next_unlimited) {
+    cxstring str = CX_STR("some;-;otherwise;-;separated;-;string;-;");
+    cxstring delim = CX_STR(";-;");
+    CX_TEST_DO {
+        CxStrtokCtx ctx = cx_strtok(str, delim, SIZE_MAX);
+        bool ret;
+        cxstring tok;
+
+        ret = cx_strtok_next(&ctx, &tok);
+        CX_TEST_ASSERT(ret);
+        CX_TEST_ASSERT(0 == cx_strcmp(tok, CX_STR("some")));
+        CX_TEST_ASSERT(ctx.pos == 0);
+        CX_TEST_ASSERT(ctx.next_pos == 7);
+        CX_TEST_ASSERT(ctx.delim_pos == 4);
+        CX_TEST_ASSERT(ctx.found == 1);
+
+        ret = cx_strtok_next(&ctx, &tok);
+        CX_TEST_ASSERT(ret);
+        CX_TEST_ASSERT(0 == cx_strcmp(tok, CX_STR("otherwise")));
+        CX_TEST_ASSERT(ctx.pos == 7);
+        CX_TEST_ASSERT(ctx.next_pos == 19);
+        CX_TEST_ASSERT(ctx.delim_pos == 16);
+        CX_TEST_ASSERT(ctx.found == 2);
+
+        ret = cx_strtok_next(&ctx, &tok);
+        CX_TEST_ASSERT(ret);
+        CX_TEST_ASSERT(0 == cx_strcmp(tok, CX_STR("separated")));
+        CX_TEST_ASSERT(ctx.pos == 19);
+        CX_TEST_ASSERT(ctx.next_pos == 31);
+        CX_TEST_ASSERT(ctx.delim_pos == 28);
+        CX_TEST_ASSERT(ctx.found == 3);
+
+        ret = cx_strtok_next(&ctx, &tok);
+        CX_TEST_ASSERT(ret);
+        CX_TEST_ASSERT(0 == cx_strcmp(tok, CX_STR("string")));
+        CX_TEST_ASSERT(ctx.pos == 31);
+        CX_TEST_ASSERT(ctx.next_pos == 40);
+        CX_TEST_ASSERT(ctx.delim_pos == 37);
+        CX_TEST_ASSERT(ctx.found == 4);
+
+        ret = cx_strtok_next(&ctx, &tok);
+        CX_TEST_ASSERT(ret);
+        CX_TEST_ASSERT(0 == cx_strcmp(tok, CX_STR("")));
+        CX_TEST_ASSERT(ctx.pos == 40);
+        CX_TEST_ASSERT(ctx.next_pos == 40);
+        CX_TEST_ASSERT(ctx.delim_pos == 40);
+        CX_TEST_ASSERT(ctx.found == 5);
+
+        ret = cx_strtok_next(&ctx, &tok);
+        CX_TEST_ASSERT(!ret);
+        CX_TEST_ASSERT(ctx.pos == 40);
+        CX_TEST_ASSERT(ctx.delim_pos == 40);
+        CX_TEST_ASSERT(ctx.found == 5);
+    }
+}
+
+CX_TEST(test_strtok_next_advanced) {
+    cxmutstr str = cx_strdup(CX_STR("an,arbitrarily;||separated;string"));
+    cxstring delim = CX_STR(",");
+    cxstring delim_more[2] = {CX_STR("||"), CX_STR(";")};
+    CX_TEST_DO {
+        CxStrtokCtx ctx = cx_strtok_m(str, delim, 10);
+        cx_strtok_delim(&ctx, delim_more, 2);
+        bool ret;
+        cxmutstr tok;
+
+        ret = cx_strtok_next_m(&ctx, &tok);
+        CX_TEST_ASSERT(ret);
+        CX_TEST_ASSERT(0 == cx_strcmp(cx_strcast(tok), CX_STR("an")));
+        CX_TEST_ASSERT(ctx.pos == 0);
+        CX_TEST_ASSERT(ctx.next_pos == 3);
+        CX_TEST_ASSERT(ctx.delim_pos == 2);
+        CX_TEST_ASSERT(ctx.found == 1);
+        cx_strupper(tok);
+
+        ret = cx_strtok_next_m(&ctx, &tok);
+        CX_TEST_ASSERT(ret);
+        CX_TEST_ASSERT(0 == cx_strcmp(cx_strcast(tok), CX_STR("arbitrarily")));
+        CX_TEST_ASSERT(ctx.pos == 3);
+        CX_TEST_ASSERT(ctx.next_pos == 15);
+        CX_TEST_ASSERT(ctx.delim_pos == 14);
+        CX_TEST_ASSERT(ctx.found == 2);
+        cx_strupper(tok);
+
+        ret = cx_strtok_next_m(&ctx, &tok);
+        CX_TEST_ASSERT(ret);
+        CX_TEST_ASSERT(0 == cx_strcmp(cx_strcast(tok), CX_STR("")));
+        CX_TEST_ASSERT(ctx.pos == 15);
+        CX_TEST_ASSERT(ctx.next_pos == 17);
+        CX_TEST_ASSERT(ctx.delim_pos == 15);
+        CX_TEST_ASSERT(ctx.found == 3);
+        cx_strupper(tok);
+
+        ret = cx_strtok_next_m(&ctx, &tok);
+        CX_TEST_ASSERT(ret);
+        CX_TEST_ASSERT(0 == cx_strcmp(cx_strcast(tok), CX_STR("separated")));
+        CX_TEST_ASSERT(ctx.pos == 17);
+        CX_TEST_ASSERT(ctx.next_pos == 27);
+        CX_TEST_ASSERT(ctx.delim_pos == 26);
+        CX_TEST_ASSERT(ctx.found == 4);
+        cx_strupper(tok);
+
+        ret = cx_strtok_next_m(&ctx, &tok);
+        CX_TEST_ASSERT(ret);
+        CX_TEST_ASSERT(0 == cx_strcmp(cx_strcast(tok), CX_STR("string")));
+        CX_TEST_ASSERT(ctx.pos == 27);
+        CX_TEST_ASSERT(ctx.next_pos == 33);
+        CX_TEST_ASSERT(ctx.delim_pos == 33);
+        CX_TEST_ASSERT(ctx.found == 5);
+        cx_strupper(tok);
+
+        ret = cx_strtok_next_m(&ctx, &tok);
+        CX_TEST_ASSERT(!ret);
+        CX_TEST_ASSERT(ctx.pos == 27);
+        CX_TEST_ASSERT(ctx.next_pos == 33);
+        CX_TEST_ASSERT(ctx.delim_pos == 33);
+        CX_TEST_ASSERT(ctx.found == 5);
+
+        CX_TEST_ASSERT(0 == cx_strcmp(cx_strcast(str), CX_STR("AN,ARBITRARILY;||SEPARATED;STRING")));
+    }
+    cx_strfree(&str);
+}
+
+
+CxTestSuite *cx_test_suite_string(void) {
+    CxTestSuite *suite = cx_test_suite_new("string");
+
+    cx_test_register(suite, test_string_construct);
+    cx_test_register(suite, test_strfree);
+    cx_test_register(suite, test_strdup);
+    cx_test_register(suite, test_strdup_shortened);
+    cx_test_register(suite, test_strlen);
+    cx_test_register(suite, test_strsubs);
+    cx_test_register(suite, test_strchr);
+    cx_test_register(suite, test_strrchr);
+    cx_test_register(suite, test_strstr);
+    cx_test_register(suite, test_strcmp);
+    cx_test_register(suite, test_strcasecmp);
+    cx_test_register(suite, test_strcat);
+    cx_test_register(suite, test_strsplit);
+    cx_test_register(suite, test_strsplit_a);
+    cx_test_register(suite, test_strtrim);
+    cx_test_register(suite, test_strprefix);
+    cx_test_register(suite, test_strsuffix);
+    cx_test_register(suite, test_strcaseprefix);
+    cx_test_register(suite, test_strcasesuffix);
+    cx_test_register(suite, test_strreplace);
+    cx_test_register(suite, test_strupper);
+    cx_test_register(suite, test_strlower);
+    cx_test_register(suite, test_strtok);
+    cx_test_register(suite, test_strtok_m);
+    cx_test_register(suite, test_strtok_delim);
+    cx_test_register(suite, test_strtok_next_easy);
+    cx_test_register(suite, test_strtok_next_unlimited);
+    cx_test_register(suite, test_strtok_next_advanced);
+
+    return suite;
+}