1 files changed, 91 insertions, 0 deletions
diff --git a/test/lower-test.c b/test/lower-test.c
new file mode 100644
index 0000000..f6069ba
--- /dev/null
+++ b/test/lower-test.c
@@ -0,0 +1,91 @@
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <alloc.h>
+#include <errors.h>
+#include <macros.h>
+#include <mbstring.h>
+#include <unicode/string.h>
+
+#define TESTFILE "lower.in"
+
+static bool test(const char8_t *, int);
+
+int
+main(int, char **argv)
+{
+	int rv;
+	size_t n;
+	ssize_t nr;
+	char *line;
+	FILE *fp;
+
+	rv = EXIT_SUCCESS;
+	line = nullptr;
+	mlib_setprogname(argv[0]);
+
+	if ((fp = fopen(TESTFILE, "r")) == nullptr)
+		err("fopen: %s:", TESTFILE);
+
+	for (int id = 1; (nr = getline(&line, &n, fp)) > 0; id++) {
+		if (line[nr - 1] == '\n')
+			line[--nr] = '\0';
+
+		if (!test(line, id))
+			rv = EXIT_FAILURE;
+	}
+	if (ferror(fp))
+		err("getline: %s:", TESTFILE);
+
+	free(line);
+	fclose(fp);
+	return rv;
+}
+
+bool
+test(const char8_t *line, int id)
+{
+	struct u8view before, after, flags;
+	before.p = line;
+	after.p = strchr(line, ';') + 1;
+	before.len = after.p - before.p - 1;
+	flags.p = strchr(after.p, ';') + 1;
+	after.len = flags.p - after.p - 1;
+	flags.len = strlen(flags.p);
+
+	enum caseflags cf = 0;
+	if (u8eq(U8_ARGS(flags), U8_ARGS(U8("ẞ"))))
+		cf |= CF_ẞ;
+	else if (u8eq(U8_ARGS(flags), U8_ARGS(U8("AZ"))))
+		cf |= CF_LANG_AZ;
+	else if (u8eq(U8_ARGS(flags), U8_ARGS(U8("LT"))))
+		cf |= CF_LANG_LT;
+
+	char8_t *buf = bufalloc(nullptr, 1, after.len);
+	size_t bufsz = u8lower(nullptr, 0, U8_ARGS(before), cf);
+	if (bufsz != after.len) {
+		warn("case %d: expected lowercased buffer size of %zu but got %zu "
+		     "(flags=‘%.*s’)",
+		     id, after.len, bufsz, U8_PRI_ARGS(flags));
+		return false;
+	}
+
+	bufsz = u8lower(buf, bufsz, U8_ARGS(before), cf);
+	if (bufsz != after.len) {
+		warn("case %d: expected lowercased length of %zu but got %zu "
+		     "(flags=‘%.*s’)",
+		     id, after.len, bufsz, U8_PRI_ARGS(flags));
+		return false;
+	}
+
+	if (!memeq(buf, after.p, bufsz)) {
+		warn("case %d: expected ‘%.*s’ but got ‘%.*s’ (flags=‘%.*s’)", id,
+		     U8_PRI_ARGS(after), (int)bufsz, buf, U8_PRI_ARGS(flags));
+		return false;
+	}
+
+	free(buf);
+	return true;
+}