diff --git a/tests/unit-tests/exclude.t.cpp b/tests/unit-tests/exclude.t.cpp
index a211f15..88b692a 100644
--- a/tests/unit-tests/exclude.t.cpp
+++ b/tests/unit-tests/exclude.t.cpp
@@ -189,6 +189,34 @@
   // const uint8_t ANY_COMPONENT_ANY[] = { 0x10, 0x07, 0x13, 0x00, 0x08, 0x01, 0x54, 0x13, 0x00 };
   // BOOST_CHECK_THROW(e2.wireDecode(Block(ANY_COMPONENT_ANY, sizeof(ANY_COMPONENT_ANY))),
   //                   Exclude::Error);
+
+  uint8_t WIRE[] = {
+    0x10, 0x20, // Exclude
+          0x01, 0x1E, // ImplicitSha256DigestComponent with incorrect length
+                0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd,
+                0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd,
+                0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd,
+                0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd
+  };
+
+  BOOST_CHECK_THROW(Exclude().wireDecode(Block(WIRE, sizeof(WIRE))), Exclude::Error);
+}
+
+BOOST_AUTO_TEST_CASE(ImplicitSha256Digest)
+{
+  uint8_t WIRE[] = {
+    0x10, 0x22, // Exclude
+          0x01, 0x20, // ImplicitSha256DigestComponent
+                0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd,
+                0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd,
+                0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd,
+                0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd
+  };
+
+  Block block(WIRE, sizeof(WIRE));
+
+  Exclude exclude;
+  BOOST_CHECK_NO_THROW(exclude.wireDecode(block));
 }
 
 BOOST_AUTO_TEST_SUITE_END()