1 files changed, 46 insertions, 0 deletions
diff --git a/spec/ruby/library/zlib/adler32_spec.rb b/spec/ruby/library/zlib/adler32_spec.rb
new file mode 100644
index 0000000000..1767dc2011
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+++ b/spec/ruby/library/zlib/adler32_spec.rb
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+require File.expand_path('../../../spec_helper', __FILE__)
+require 'zlib'
+
+describe "Zlib.adler32" do
+  it "calculates Adler checksum for string" do
+    Zlib.adler32("").should == 1
+    Zlib.adler32(" ").should == 2162721
+    Zlib.adler32("123456789").should == 152961502
+    Zlib.adler32("!@#\{$\}%^&**()").should == 365495023
+    Zlib.adler32("to be or not to be" * 22).should == 3979904837
+    Zlib.adler32("0").should == 3211313
+    Zlib.adler32((2**32).to_s).should == 193331739
+    Zlib.adler32((2**64).to_s).should == 723452953
+  end
+
+  it "calculates Adler checksum for string and initial Adler value" do
+    test_string = "This is a test string! How exciting!%?"
+    Zlib.adler32(test_string, 0).should == 63900955
+    Zlib.adler32(test_string, 1).should == 66391324
+    Zlib.adler32(test_string, 2**8).should == 701435419
+    Zlib.adler32(test_string, 2**16).should == 63966491
+    lambda { Zlib.adler32(test_string, 2**128) }.should raise_error(RangeError)
+  end
+
+  it "calculates the Adler checksum for string and initial Adler value for Bignums" do
+    test_string = "This is a test string! How exciting!%?"
+    Zlib.adler32(test_string, 2**30).should == 1137642779
+  end
+
+  it "assumes that the initial value is given to adler, if adler is omitted" do
+    orig_crc = Zlib.adler32
+    Zlib.adler32("").should == Zlib.adler32("", orig_crc)
+    Zlib.adler32(" ").should == Zlib.adler32(" ", orig_crc)
+    Zlib.adler32("123456789").should == Zlib.adler32("123456789", orig_crc)
+    Zlib.adler32("!@#\{$\}%^&**()").should == Zlib.adler32("!@#\{$\}%^&**()", orig_crc)
+    Zlib.adler32("to be or not to be" * 22).should == Zlib.adler32("to be or not to be" * 22, orig_crc)
+    Zlib.adler32("0").should == Zlib.adler32("0", orig_crc)
+    Zlib.adler32((2**32).to_s).should == Zlib.adler32((2**32).to_s, orig_crc)
+    Zlib.adler32((2**64).to_s).should == Zlib.adler32((2**64).to_s, orig_crc)
+  end
+
+  it "it returns the CRC initial value, if string is omitted" do
+    Zlib.adler32.should == 1
+  end
+
+end