test: add litest_assert_strv_no_substring

To verify a strv does *not* include a given substring

Part-of: <https://gitlab.freedesktop.org/libinput/libinput/-/merge_requests/1284>

test/litest.c

@@ -4889,6 +4889,31 @@ _litest_assert_strv_substring(char **strv,
 	}
 }
 
+void
+_litest_assert_strv_no_substring(char **strv,
+				 char *substring,
+				 const char *file,
+				 const char *func,
+				 int line)
+{
+	if (!strv)
+		return;
+
+	size_t index;
+	bool found = strv_find_substring(strv, substring, &index);
+	if (found) {
+		_autofree_ char *strv_str = strv_join(strv, "', '");
+		_litest_abort_msg(
+			file,
+			line,
+			func,
+			"Unexpected substring '%s' present at index %zd in strv: ['%s']",
+			substring,
+			index,
+			strv_str);
+	}
+}
+
 void
 litest_push_event_frame(struct litest_device *dev)
 {

test/litest.h

@@ -408,6 +408,16 @@ _litest_assert_strv_substring(char **strv,
 #define litest_assert_strv_substring(strv_, substring_) \
 	_litest_assert_strv_substring(strv_, substring_, __FILE__, __func__, __LINE__)
 
+void
+_litest_assert_strv_no_substring(char **strv,
+				 char *substring,
+				 const char *file,
+				 const char *func,
+				 int line);
+
+#define litest_assert_strv_no_substring(strv_, substring_) \
+	_litest_assert_strv_no_substring(strv_, substring_, __FILE__, __func__, __LINE__)
+
 void
 litest_backtrace(const char *func);