tests: update logger

.gdbinit

@@ -0,0 +1 @@
+source icu_unicodestring_prettyprinter.py

icu_unicodestring_prettyprinter.py

@@ -0,0 +1,53 @@
+# To autoload this file into GDB, put the following line in ~/.gdbinit:
+#
+#     python execfile("/path/to/icu_unicodestring_prettyprinter.py")
+#
+# You can also run that line of code in the GDB console without adding it to ~/.gdbinit.
+
+from __future__ import print_function
+from array import array
+import re
+import gdb
+
+class UnicodeStringPrinter:
+	"""GDB pretty printer for ICU4C UnicodeString"""
+
+	def __init__(self, val):
+		self.val = val
+
+	def to_string(self):
+
+		fLengthAndFlags = self.val["fUnion"]["fFields"]["fLengthAndFlags"]
+
+		if fLengthAndFlags >= 0:
+			# Short length
+			length = fLengthAndFlags >> 5
+		else:
+			# Long length
+			length = self.val["fUnion"]["fFields"]["fLength"]
+
+		if (fLengthAndFlags & 2) != 0:
+			# Stack storage
+			if (fLengthAndFlags & 1) != 0:
+				return u"UnicodeString (BOGUS)"
+			stack = True
+			buffer = self.val["fUnion"]["fStackFields"]["fBuffer"]
+		else:
+			# Heap storage
+			stack = False
+			buffer = self.val["fUnion"]["fFields"]["fArray"]
+
+		content = array('B', [buffer[i] for i in range(length)]).tostring()
+		return u"UnicodeString (%d on %s): \"%s\"" % (
+			length,
+			u"stack" if stack else u"heap",
+			content)
+
+unicode_string_re = re.compile("^icu_?\d*::UnicodeString$")
+
+def lookup_type(val):
+	if unicode_string_re.match(str(val.type.unqualified().strip_typedefs())):
+		return UnicodeStringPrinter(val)
+	return None
+
+gdb.pretty_printers.append(lookup_type)

tests/unit/TestLogger.h

@@ -23,6 +23,11 @@ class TestLogger : public Logger
     //std::cerr << message << '\n';
   }
 
+  void flush() override
+  {
+
+  }
+
   bool message_exists() const { return !log_messages.empty(); }
   bool message_print(bool waiting_exist = false) const
   {