Merge pull request #2014 from reitermarkus/spec-checksum

Convert Checksum test to spec.

Author: reitermarkus

Library/Homebrew/test/checksum_spec.rb

@@ -0,0 +1,19 @@
+require "checksum"
+
+describe Checksum do
+  describe "#empty?" do
+    subject { described_class.new(:sha256, "") }
+    it { is_expected.to be_empty }
+  end
+
+  describe "#==" do
+    subject { described_class.new(:sha256, TEST_SHA256) }
+    let(:other) { described_class.new(:sha256, TEST_SHA256) }
+    let(:other_reversed) { described_class.new(:sha256, TEST_SHA256.reverse) }
+    let(:other_sha1) { described_class.new(:sha1, TEST_SHA1) }
+
+    it { is_expected.to eq(other) }
+    it { is_expected.not_to eq(other_reversed) }
+    it { is_expected.not_to eq(other_sha1) }
+  end
+end