Merge pull request #3090 from ipfs/feat/test-cover-blocks-util

test: 100% coverage for blocks/blocksutil

blocks/blocksutil/block_generator_test.go

+package blocksutil
+
+import "testing"
+
+func TestBlocksAreDifferent(t *testing.T) {
+	gen := NewBlockGenerator()
+
+	blocks := gen.Blocks(100)
+
+	for i, block1 := range blocks {
+		for j, block2 := range blocks {
+			if i != j {
+				if block1.String() == block2.String() {
+					t.Error("Found duplicate blocks")
+				}
+			}
+		}
+	}
+}