Implement spawnFunction from the new isolate api.

runtime/vm/object_test.cc

Index: runtime/vm/object_test.cc
===================================================================
--- runtime/vm/object_test.cc	(revision 5367)
+++ runtime/vm/object_test.cc	(working copy)
@@ -603,6 +603,31 @@
 }
 
 
+TEST_CASE(StringFormat) {

[siva, 2012/03/13 19:45:21]

const char* hello_str = "Hello World!";
int32_t hello_len = strlen(hello_str);

[turnidge, 2012/03/13 21:23:37]

Done.

+  int32_t hello_len = strlen("Hello World!");
+  const String& str = String::Handle(String::NewFormat("Hello %s!", "World"));
+  EXPECT(str.IsInstance());
+  EXPECT(str.IsString());
+  EXPECT(str.IsOneByteString());
+  EXPECT(!str.IsTwoByteString());
+  EXPECT(!str.IsFourByteString());
+  EXPECT(!str.IsNumber());
+  EXPECT_EQ(hello_len, str.Length());
+  EXPECT_EQ('H', str.CharAt(0));
+  EXPECT_EQ('e', str.CharAt(1));
+  EXPECT_EQ('l', str.CharAt(2));
+  EXPECT_EQ('l', str.CharAt(3));
+  EXPECT_EQ('o', str.CharAt(4));
+  EXPECT_EQ(' ', str.CharAt(5));
+  EXPECT_EQ('W', str.CharAt(6));
+  EXPECT_EQ('o', str.CharAt(7));
+  EXPECT_EQ('r', str.CharAt(8));
+  EXPECT_EQ('l', str.CharAt(9));
+  EXPECT_EQ('d', str.CharAt(10));
+  EXPECT_EQ('!', str.CharAt(11));

[siva, 2012/03/13 19:45:21]

EXPECT_EQ(str.Equals(hello_str));

instead of these individual checks?

[turnidge, 2012/03/13 21:23:37]

Just mimicking existing tests.  Didn't realize we had an Equals that took a
char*.  Fixed.

+}
+
+
 TEST_CASE(StringConcat) {
   // Create strings from concatenated 1-byte empty strings.
   {