Merge pull request #26 from K-S-A/master

Update Utils.zunpad and add specs

lib/eth/utils.rb

@@ -86,7 +86,7 @@ def zpad(x, l)
     end
 
     def zunpad(x)
-      x.sub /\A\x00+/, ''
+      x.sub(/\A\x00+/, '')
     end
 
     def zpad_int(n, l=32)

spec/eth/utils_spec.rb

@@ -90,4 +90,31 @@
     end
   end
 
+  describe ".zunpad" do
+    subject { Eth::Utils.zunpad(address) }
+
+    context "with single leading null byte" do
+      let(:address) { "\0\xc8\x1b\x94\x934 \"\x1az\xc0\x04\xa9\x02B\xd8\xb1\xd3\xe5\x07\r" }
+
+      it "returns address without leading null byte" do
+        expect(subject).to eq("\xc8\x1b\x94\x934 \"\x1az\xc0\x04\xa9\x02B\xd8\xb1\xd3\xe5\x07\r")
+      end
+    end
+
+    context "with multiple leading null bytes" do
+      let(:address) { "\0\0\xc8\x1b\x94\x934 \"\x1az\xc0\x04\xa9\x02B\xd8\xb1\xd3\xe5\x07\r" }
+
+      it "returns address without leading null bytes" do
+        expect(subject).to eq("\xc8\x1b\x94\x934 \"\x1az\xc0\x04\xa9\x02B\xd8\xb1\xd3\xe5\x07\r")
+      end
+    end
+
+    context "without leading null byte" do
+      let(:address) { "\xc8\x1b\x94\x934 \"\x1az\xc0\x04\xa9\x02B\xd8\xb1\xd3\xe5\x07\r" }
+
+      it "returns unchanged address" do
+        expect(subject).to eq("\xc8\x1b\x94\x934 \"\x1az\xc0\x04\xa9\x02B\xd8\xb1\xd3\xe5\x07\r")
+      end
+    end
+  end
 end