Increase test coverage in block.rs

Add tests to `primitive::block` module to increase test coverage.

primitives/src/block.rs

@@ -406,6 +406,12 @@ mod tests {
         assert_eq!(version.to_consensus(), 1_234_567_890);
     }
 
+    #[test]
+    fn version_default() {
+        let version = Version::default();
+        assert_eq!(version.to_consensus(), Version::NO_SOFT_FORK_SIGNALLING.to_consensus());
+    }
+
     // Check that the size of the header consensus serialization matches the const SIZE value
     #[test]
     fn header_size() {
@@ -422,4 +428,108 @@ mod tests {
 
         assert_eq!(header_size, Header::SIZE);
     }
+
+    #[test]
+    #[cfg(feature = "alloc")]
+    fn block_new_unchecked() {
+        let header = dummy_header();
+        let transactions = vec![];
+        let block = Block::new_unchecked(header, transactions.clone());
+        assert_eq!(block.header, header);
+        assert_eq!(block.transactions, transactions);
+    }
+
+    #[test]
+    #[cfg(feature = "alloc")]
+    fn block_assume_checked() {
+        let header = dummy_header();
+        let transactions = vec![];
+        let block = Block::new_unchecked(header, transactions.clone());
+        let witness_root = Some(WitnessMerkleNode::from_byte_array([0x88; 32]));
+        let checked_block = block.assume_checked(witness_root);
+        assert_eq!(checked_block.header(), &header);
+        assert_eq!(checked_block.transactions(), &transactions);
+        assert_eq!(checked_block.cached_witness_root(), witness_root);
+    }
+
+    #[test]
+    #[cfg(feature = "alloc")]
+    fn block_into_parts() {
+        let header = dummy_header();
+        let transactions = vec![];
+        let block = Block::new_unchecked(header, transactions.clone());
+        let (block_header, block_transactions) = block.into_parts();
+        assert_eq!(block_header, header);
+        assert_eq!(block_transactions, transactions);
+    }
+
+    #[test]
+    #[cfg(feature = "alloc")]
+    fn block_cached_witness_root() {
+        let header = dummy_header();
+        let transactions = vec![];
+        let block = Block::new_unchecked(header, transactions);
+        let witness_root = Some(WitnessMerkleNode::from_byte_array([0x88; 32]));
+        let checked_block = block.assume_checked(witness_root);
+        assert_eq!(checked_block.cached_witness_root(), witness_root);
+    }
+
+    #[test]
+    #[cfg(feature = "alloc")]
+    fn block_block_hash() {
+        let header = dummy_header();
+        let transactions = vec![];
+        let block = Block::new_unchecked(header, transactions);
+        assert_eq!(block.block_hash(), header.block_hash());
+    }
+
+    #[test]
+    fn block_hash_from_header() {
+        let header = dummy_header();
+        let block_hash = header.block_hash();
+        assert_eq!(block_hash, BlockHash::from(header));
+    }
+
+    #[test]
+    fn block_hash_from_header_ref() {
+        let header = dummy_header();
+        let block_hash: BlockHash = BlockHash::from(&header);
+        assert_eq!(block_hash, header.block_hash());
+    }
+
+    #[test]
+    #[cfg(feature = "alloc")]
+    fn block_hash_from_block() {
+        let header = dummy_header();
+        let transactions = vec![];
+        let block = Block::new_unchecked(header, transactions);
+        let block_hash: BlockHash = BlockHash::from(block);
+        assert_eq!(block_hash, header.block_hash());
+    }
+
+    #[test]
+    #[cfg(feature = "alloc")]
+    fn block_hash_from_block_ref() {
+        let header = dummy_header();
+        let transactions = vec![];
+        let block = Block::new_unchecked(header, transactions);
+        let block_hash: BlockHash = BlockHash::from(&block);
+        assert_eq!(block_hash, header.block_hash());
+    }
+
+    #[test]
+    fn header_debug() {
+        let header = dummy_header();
+        let expected = format!(
+            "Header {{ block_hash: {:?}, version: {:?}, prev_blockhash: {:?}, merkle_root: {:?}, time: {:?}, bits: {:?}, nonce: {:?} }}",
+            header.block_hash(),
+            header.version,
+            header.prev_blockhash,
+            header.merkle_root,
+            header.time,
+            header.bits,
+            header.nonce
+        );
+        assert_eq!(format!("{:?}", header), expected);
+    }
 }