Add tests that CodedOutputStream.spaceLeft isn't negative after overflow.

For writing fixed32 and fixed64.

Not all encoders pass this test yet.

PiperOrigin-RevId: 677948616

java/core/src/test/java/com/google/protobuf/CodedOutputStreamTest.java

@@ -294,6 +294,12 @@ public class CodedOutputStreamTest {
     for (int i = 0; i < 4; i++) {
       Coder coder = outputType.newCoder(i);
       assertThrows(OutOfSpaceException.class, () -> coder.stream().writeFixed32NoTag(1));
+      // These OutputTypes are not behaving correctly yet.
+      if (outputType != OutputType.ARRAY
+          && outputType != OutputType.NIO_HEAP
+          && outputType != OutputType.NIO_HEAP_WITH_INITIAL_OFFSET) {
+        assertThat(coder.stream().spaceLeft()).isEqualTo(i);
+      }
     }
   }
 
@@ -305,6 +311,12 @@ public class CodedOutputStreamTest {
     for (int i = 0; i < 8; i++) {
       Coder coder = outputType.newCoder(i);
       assertThrows(OutOfSpaceException.class, () -> coder.stream().writeFixed64NoTag(1));
+      // These OutputTypes are not behaving correctly yet.
+      if (outputType != OutputType.ARRAY
+          && outputType != OutputType.NIO_HEAP
+          && outputType != OutputType.NIO_HEAP_WITH_INITIAL_OFFSET) {
+        assertThat(coder.stream().spaceLeft()).isEqualTo(i);
+      }
     }
   }