Added an encode/decode test for 'required' fields of all types.

tests/test_encode3.c

@@ -0,0 +1,50 @@
+/* Attempts to test all the datatypes supported by ProtoBuf.
+ * Currently only tests the 'required' variety.
+ */
+
+#include <stdio.h>
+#include <pb_encode.h>
+#include "alltypes.pb.h"
+
+int main()
+{
+    /* Initialize the structure with constants */
+    AllTypes alltypes = {
+        1001,
+        1002,
+        1003,
+        1004,
+        1005,
+        1006,
+        true,
+        
+        1008,
+        1009,
+        1010.0f,
+        
+        1011,
+        1012,
+        1013.0,
+        
+        "1014",
+        {4, "1015"},
+        {"1016", 1016},
+        MyEnum_Truth,
+        
+        1099
+    };
+    
+    uint8_t buffer[512];
+    pb_ostream_t stream = pb_ostream_from_buffer(buffer, sizeof(buffer));
+    
+    /* Now encode it and check if we succeeded. */
+    if (pb_encode(&stream, AllTypes_fields, &alltypes))
+    {
+        fwrite(buffer, 1, stream.bytes_written, stdout);
+        return 0; /* Success */
+    }
+    else
+    {
+        return 1; /* Failure */
+    }
+}