implement indextargets option 'DefaultEnabled'

[apt.git] / test / libapt / hashsums_test.cc

diff --git a/test/libapt/hashsums_test.cc b/test/libapt/hashsums_test.cc
index ff153671860e9bc70e8f4fb17cfbb08a5b75972c..63c63ecd3051fa2c4d98ac60ad0d32c5b8fc2f1a 100644 (file)
--- a/test/libapt/hashsums_test.cc
+++ b/test/libapt/hashsums_test.cc
@@ -1,13 +1,20 @@
+#include <config.h>
+
+#include <apt-pkg/configuration.h>

 #include <apt-pkg/md5.h>
 #include <apt-pkg/sha1.h>
 #include <apt-pkg/sha2.h>
 #include <apt-pkg/strutl.h>
 #include <apt-pkg/hashes.h>
 #include <apt-pkg/md5.h>
 #include <apt-pkg/sha1.h>
 #include <apt-pkg/sha2.h>
 #include <apt-pkg/strutl.h>
 #include <apt-pkg/hashes.h>

+#include <apt-pkg/fileutl.h>
+

 #include <iostream>
 #include <iostream>

+#include <stdlib.h>
+#include <string>

 
 

-#include <stdio.h>
+#include <gtest/gtest.h>

 
 

-#include "assert.h"
+#include "file-helpers.h"

 
 template <class T> void Test(const char *In,const char *Out)
 {
 
 template <class T> void Test(const char *In,const char *Out)
 {


@@ -16,126 +23,349 @@ template <class T> void Test(const char *In,const char *Out)
    equals(Sum.Result().Value(), Out);
 }
 
    equals(Sum.Result().Value(), Out);
 }
 

-template <class T> void TestMill(const char *Out)
+
+
+TEST(HashSumsTest,SummationStrings)

 {
 {

-   T Sum;
+#define EXPECT_SUM(Summation, In, Out) \
+   { \
+      Summation Sum; \
+      Sum.Add(In); \
+      EXPECT_EQ(Sum.Result().Value(), Out) << #Summation << " for '" << In << "'"; \
+   }
+
+   // From  FIPS PUB 180-1
+   EXPECT_SUM(SHA1Summation, "","da39a3ee5e6b4b0d3255bfef95601890afd80709");
+   EXPECT_SUM(SHA1Summation, "abc","a9993e364706816aba3e25717850c26c9cd0d89d");
+   EXPECT_SUM(SHA1Summation, "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq",
+        "84983e441c3bd26ebaae4aa1f95129e5e54670f1");
+
+   // MD5 tests from RFC 1321
+   EXPECT_SUM(MD5Summation, "","d41d8cd98f00b204e9800998ecf8427e");
+   EXPECT_SUM(MD5Summation, "a","0cc175b9c0f1b6a831c399e269772661");
+   EXPECT_SUM(MD5Summation, "abc","900150983cd24fb0d6963f7d28e17f72");
+   EXPECT_SUM(MD5Summation, "message digest","f96b697d7cb7938d525a2f31aaf161d0");
+   EXPECT_SUM(MD5Summation, "abcdefghijklmnopqrstuvwxyz","c3fcd3d76192e4007dfb496cca67e13b");
+   EXPECT_SUM(MD5Summation, "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789",
+        "d174ab98d277d9f5a5611c2c9f419d9f");
+   EXPECT_SUM(MD5Summation, "12345678901234567890123456789012345678901234567890123456789012345678901234567890",
+        "57edf4a22be3c955ac49da2e2107b67a");
+
+   // SHA-256, From FIPS 180-2
+   EXPECT_SUM(SHA256Summation, "", "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855");
+   EXPECT_SUM(SHA256Summation, "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq",
+        "248d6a61d20638b8e5c026930c3e6039a33ce45964ff2167f6ecedd419db06c1");
+
+   // SHA-512
+   EXPECT_SUM(SHA512Summation, "",
+        "cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce"
+        "47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e");
+   EXPECT_SUM(SHA512Summation, "abc",
+        "ddaf35a193617abacc417349ae20413112e6fa4e89a97ea20a9eeee64b55d39a"
+        "2192992a274fc1a836ba3c23a3feebbd454d4423643ce80e2a9ac94fa54ca49f");
+

 
 

-   const unsigned char As[] = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
-   unsigned Count = 1000000;
-   for (; Count != 0;)
+   EXPECT_SUM(MD5Summation, "The quick brown fox jumps over the lazy dog", "9e107d9d372bb6826bd81d3542a419d6");
+   EXPECT_SUM(MD5Summation, "The quick brown fox jumps over the lazy dog.", "e4d909c290d0fb1ca068ffaddf22cbd0");
+   EXPECT_SUM(SHA1Summation, "The quick brown fox jumps over the lazy dog", "2fd4e1c67a2d28fced849ee1bb76e7391b93eb12");
+   EXPECT_SUM(SHA1Summation, "The quick brown fox jumps over the lazy cog", "de9f2c7fd25e1b3afad3e85a0bd17d9b100db4b3");
+   EXPECT_SUM(SHA256Summation, "The quick brown fox jumps over the lazy dog", "d7a8fbb307d7809469ca9abcb0082e4f8d5651e46d3cdb762d02d0bf37c9e592");
+   EXPECT_SUM(SHA256Summation, "The quick brown fox jumps over the lazy dog.", "ef537f25c895bfa782526529a9b63d97aa631564d5d789c2b765448c8635fb6c");
+   EXPECT_SUM(SHA512Summation, "The quick brown fox jumps over the lazy dog", "07e547d9586f6a73f73fbac0435ed76951218fb7d0c8d788a309d785436bbb64"
+        "2e93a252a954f23912547d1e8a3b5ed6e1bfd7097821233fa0538f3db854fee6");
+   EXPECT_SUM(SHA512Summation, "The quick brown fox jumps over the lazy dog.", "91ea1245f20d46ae9a037a989f54f1f790f0a47607eeb8a14d12890cea77a1bb"
+        "c6c7ed9cf205e67b7f2b8fd4c7dfd3a7a8617e45f3c463d481c7e586c39ac1ed");
+
+#undef EXPECT_SUM
+}
+TEST(HashSumsTest, Mill)
+{
+   SHA1Summation Sum1;
+
+   const unsigned char As[] = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
+   size_t const AsCount = sizeof(As)/sizeof(As[0]) - 1;
+   size_t Count = 1000000;
+   while (Count != 0)

    {
    {

-      if (Count >= 64)
+      if (Count >= AsCount)

       {
       {

-        Sum.Add(As,64);
-        Count -= 64;
+        Sum1.Add(As, AsCount);
+        Count -= AsCount;

       }
       else
       {
       }
       else
       {

-        Sum.Add(As,Count);
+        Sum1.Add(As,Count);

         Count = 0;
       }
    }
 
         Count = 0;
       }
    }
 

-   if (stringcasecmp(Sum.Result().Value(), Out) != 0)
-      abort();
+   EXPECT_EQ("34aa973cd4c4daa4f61eeb2bdbad27316534016f", Sum1.Result().Value());

 }
 
 }
 

-int main(int argc, char** argv)
+static void getSummationString(char const * const type, std::string &sum)

 {
 {

-   // From  FIPS PUB 180-1
-   Test<SHA1Summation>("","da39a3ee5e6b4b0d3255bfef95601890afd80709");
-   Test<SHA1Summation>("abc","a9993e364706816aba3e25717850c26c9cd0d89d");
-   Test<SHA1Summation>("abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq",
-                      "84983e441c3bd26ebaae4aa1f95129e5e54670f1");
-   TestMill<SHA1Summation>("34aa973cd4c4daa4f61eeb2bdbad27316534016f");
+   /* to compare our result with an independent source we call the specific binaries
+      and read their result back. We do this with a little trick by claiming that the
+      summation is a compressor – and open the 'compressed' file later on directly to
+      read out the summation sum calculated by it */
+   APT::Configuration::Compressor compress(type, ".ext", type, NULL, NULL, 99);
+   std::string name("apt-test-");
+   name.append("hashsums").append(".XXXXXX");
+   char * tempfile = strdup(name.c_str());
+   int tempfile_fd = mkstemp(tempfile);
+   close(tempfile_fd);
+   ASSERT_NE(-1, tempfile_fd);

 
 

-   // MD5 tests from RFC 1321
-   Test<MD5Summation>("","d41d8cd98f00b204e9800998ecf8427e");
-   Test<MD5Summation>("a","0cc175b9c0f1b6a831c399e269772661");
-   Test<MD5Summation>("abc","900150983cd24fb0d6963f7d28e17f72");
-   Test<MD5Summation>("message digest","f96b697d7cb7938d525a2f31aaf161d0");
-   Test<MD5Summation>("abcdefghijklmnopqrstuvwxyz","c3fcd3d76192e4007dfb496cca67e13b");
-   Test<MD5Summation>("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789",
-                     "d174ab98d277d9f5a5611c2c9f419d9f");
-   Test<MD5Summation>("12345678901234567890123456789012345678901234567890123456789012345678901234567890",
-                     "57edf4a22be3c955ac49da2e2107b67a");
+   FileFd fd;
+   ASSERT_TRUE(fd.Open(tempfile, FileFd::WriteOnly | FileFd::Empty, compress));
+   ASSERT_TRUE(fd.IsOpen());
+   FileFd input(__FILE__, FileFd::ReadOnly);
+   ASSERT_TRUE(input.IsOpen());
+   ASSERT_NE(0, input.FileSize());
+   ASSERT_TRUE(CopyFile(input, fd));
+   ASSERT_TRUE(input.IsOpen());
+   ASSERT_TRUE(fd.IsOpen());
+   ASSERT_FALSE(fd.Failed());
+   input.Close();
+   fd.Close();
+   ASSERT_TRUE(fd.Open(tempfile, FileFd::ReadOnly, FileFd::None));
+   ASSERT_TRUE(fd.IsOpen());
+   ASSERT_NE(0, fd.FileSize());
+   ASSERT_FALSE(fd.Failed());
+   unlink(tempfile);
+   free(tempfile);
+   char readback[2000];
+   unsigned long long actual;
+   ASSERT_TRUE(fd.Read(readback, sizeof(readback)/sizeof(readback[0]), &actual));
+   actual -= 4;
+   readback[actual] = '\0';
+   sum = readback;
+}
+TEST(HashSumsTest, FileBased)
+{
+   std::string summation;

 
 

-   // SHA-256, From FIPS 180-2
-   Test<SHA256Summation>("", "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855");
-   Test<SHA256Summation>("abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq",
-                        "248d6a61d20638b8e5c026930c3e6039a33ce45964ff2167f6ecedd419db06c1");
+   getSummationString("md5sum", summation);
+   MD5SumValue md5(summation);
+   EXPECT_EQ(md5.Value(), summation);

 
 

-   // SHA-512
-   Test<SHA512Summation>("",
-       "cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce"
-       "47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e");
-   Test<SHA512Summation>(
-      "abc",
-      "ddaf35a193617abacc417349ae20413112e6fa4e89a97ea20a9eeee64b55d39a"
-      "2192992a274fc1a836ba3c23a3feebbd454d4423643ce80e2a9ac94fa54ca49f");
-
-
-   Test<MD5Summation>("The quick brown fox jumps over the lazy dog", "9e107d9d372bb6826bd81d3542a419d6");
-   Test<MD5Summation>("The quick brown fox jumps over the lazy dog.", "e4d909c290d0fb1ca068ffaddf22cbd0");
-   Test<SHA1Summation>("The quick brown fox jumps over the lazy dog", "2fd4e1c67a2d28fced849ee1bb76e7391b93eb12");
-   Test<SHA1Summation>("The quick brown fox jumps over the lazy cog", "de9f2c7fd25e1b3afad3e85a0bd17d9b100db4b3");
-   Test<SHA256Summation>("The quick brown fox jumps over the lazy dog", "d7a8fbb307d7809469ca9abcb0082e4f8d5651e46d3cdb762d02d0bf37c9e592");
-   Test<SHA256Summation>("The quick brown fox jumps over the lazy dog.", "ef537f25c895bfa782526529a9b63d97aa631564d5d789c2b765448c8635fb6c");
-   Test<SHA512Summation>("The quick brown fox jumps over the lazy dog", "07e547d9586f6a73f73fbac0435ed76951218fb7d0c8d788a309d785436bbb64"
-                                                                       "2e93a252a954f23912547d1e8a3b5ed6e1bfd7097821233fa0538f3db854fee6");
-   Test<SHA512Summation>("The quick brown fox jumps over the lazy dog.", "91ea1245f20d46ae9a037a989f54f1f790f0a47607eeb8a14d12890cea77a1bb"
-                                                                        "c6c7ed9cf205e67b7f2b8fd4c7dfd3a7a8617e45f3c463d481c7e586c39ac1ed");
-
-   FILE* fd = fopen(argv[1], "r");
-   if (fd == NULL) {
-      std::cerr << "Can't open file for 1. testing: " << argv[1] << std::endl;
-      return 1;
+   getSummationString("sha1sum", summation);
+   SHA1SumValue sha1(summation);
+   EXPECT_EQ(sha1.Value(), summation);
+
+   getSummationString("sha256sum", summation);
+   SHA256SumValue sha256(summation);
+   EXPECT_EQ(sha256.Value(), summation);
+
+   getSummationString("sha512sum", summation);
+   SHA512SumValue sha512(summation);
+   EXPECT_EQ(sha512.Value(), summation);
+
+   FileFd fd(__FILE__, FileFd::ReadOnly);
+   EXPECT_TRUE(fd.IsOpen());
+   std::string FileSize;
+   strprintf(FileSize, "%llu", fd.FileSize());
+
+   {
+      Hashes hashes;
+      hashes.AddFD(fd.Fd());
+      HashStringList list = hashes.GetHashStringList();
+      EXPECT_FALSE(list.empty());
+      EXPECT_EQ(5, list.size());
+      EXPECT_EQ(md5.Value(), list.find("MD5Sum")->HashValue());
+      EXPECT_EQ(sha1.Value(), list.find("SHA1")->HashValue());
+      EXPECT_EQ(sha256.Value(), list.find("SHA256")->HashValue());
+      EXPECT_EQ(sha512.Value(), list.find("SHA512")->HashValue());
+      EXPECT_EQ(FileSize, list.find("Checksum-FileSize")->HashValue());

    }
    }

+   unsigned long long sz = fd.FileSize();
+   fd.Seek(0);

    {
    {

-   Hashes hashes;
-   hashes.AddFD(fileno(fd));
-   equals(argv[2], hashes.MD5.Result().Value());
-   equals(argv[3], hashes.SHA1.Result().Value());
-   equals(argv[4], hashes.SHA256.Result().Value());
-   equals(argv[5], hashes.SHA512.Result().Value());
+      Hashes hashes;
+      hashes.AddFD(fd.Fd(), sz);
+      HashStringList list = hashes.GetHashStringList();
+      EXPECT_FALSE(list.empty());
+      EXPECT_EQ(5, list.size());
+      EXPECT_EQ(md5.Value(), list.find("MD5Sum")->HashValue());
+      EXPECT_EQ(sha1.Value(), list.find("SHA1")->HashValue());
+      EXPECT_EQ(sha256.Value(), list.find("SHA256")->HashValue());
+      EXPECT_EQ(sha512.Value(), list.find("SHA512")->HashValue());
+      EXPECT_EQ(FileSize, list.find("Checksum-FileSize")->HashValue());

    }
    }

-   fseek(fd, 0L, SEEK_END);
-   unsigned long sz = ftell(fd);
-   fseek(fd, 0L, SEEK_SET);
+   fd.Seek(0);

    {
    {

-   Hashes hashes;
-   hashes.AddFD(fileno(fd), sz);
-   equals(argv[2], hashes.MD5.Result().Value());
-   equals(argv[3], hashes.SHA1.Result().Value());
-   equals(argv[4], hashes.SHA256.Result().Value());
-   equals(argv[5], hashes.SHA512.Result().Value());
+      Hashes hashes(Hashes::MD5SUM | Hashes::SHA512SUM);
+      hashes.AddFD(fd);
+      HashStringList list = hashes.GetHashStringList();
+      EXPECT_FALSE(list.empty());
+      EXPECT_EQ(3, list.size());
+      EXPECT_EQ(md5.Value(), list.find("MD5Sum")->HashValue());
+      EXPECT_EQ(NULL, list.find("SHA1"));
+      EXPECT_EQ(NULL, list.find("SHA256"));
+      EXPECT_EQ(sha512.Value(), list.find("SHA512")->HashValue());
+      EXPECT_EQ(FileSize, list.find("Checksum-FileSize")->HashValue());
+      fd.Seek(0);
+      Hashes hashes2(list);
+      hashes2.AddFD(fd);
+      list = hashes2.GetHashStringList();
+      EXPECT_FALSE(list.empty());
+      EXPECT_EQ(3, list.size());
+      EXPECT_EQ(md5.Value(), list.find("MD5Sum")->HashValue());
+      EXPECT_EQ(NULL, list.find("SHA1"));
+      EXPECT_EQ(NULL, list.find("SHA256"));
+      EXPECT_EQ(sha512.Value(), list.find("SHA512")->HashValue());
+      EXPECT_EQ(FileSize, list.find("Checksum-FileSize")->HashValue());

    }
    }

-   fseek(fd, 0L, SEEK_SET);
+   fd.Seek(0);

    {
    {

-   MD5Summation md5;
-   md5.AddFD(fileno(fd));
-   equals(argv[2], md5.Result().Value());
+      MD5Summation MD5;
+      MD5.AddFD(fd.Fd());
+      EXPECT_EQ(md5.Value(), MD5.Result().Value());

    }
    }

-   fseek(fd, 0L, SEEK_SET);
+   fd.Seek(0);

    {
    {

-   SHA1Summation sha1;
-   sha1.AddFD(fileno(fd));
-   equals(argv[3], sha1.Result().Value());
+      SHA1Summation SHA1;
+      SHA1.AddFD(fd.Fd());
+      EXPECT_EQ(sha1.Value(), SHA1.Result().Value());

    }
    }

-   fseek(fd, 0L, SEEK_SET);
+   fd.Seek(0);

    {
    {

-   SHA256Summation sha2;
-   sha2.AddFD(fileno(fd));
-   equals(argv[4], sha2.Result().Value());
+      SHA256Summation SHA2;
+      SHA2.AddFD(fd.Fd());
+      EXPECT_EQ(sha256.Value(), SHA2.Result().Value());

    }
    }

-   fseek(fd, 0L, SEEK_SET);
+   fd.Seek(0);

    {
    {

-   SHA512Summation sha2;
-   sha2.AddFD(fileno(fd));
-   equals(argv[5], sha2.Result().Value());
+      SHA512Summation SHA2;
+      SHA2.AddFD(fd.Fd());
+      EXPECT_EQ(sha512.Value(), SHA2.Result().Value());

    }
    }

-   fclose(fd);
-   return 0;
+   fd.Close();
+
+   HashString sha2file("SHA512", sha512.Value());
+   EXPECT_TRUE(sha2file.VerifyFile(__FILE__));
+   HashString sha2wrong("SHA512", "00000000000");
+   EXPECT_FALSE(sha2wrong.VerifyFile(__FILE__));
+   EXPECT_EQ(sha2file, sha2file);
+   EXPECT_TRUE(sha2file == sha2file);
+   EXPECT_NE(sha2file, sha2wrong);
+   EXPECT_TRUE(sha2file != sha2wrong);
+
+   HashString sha2big("SHA256", sha256.Value());
+   EXPECT_TRUE(sha2big.VerifyFile(__FILE__));
+   HashString sha2small("sha256:" + sha256.Value());
+   EXPECT_TRUE(sha2small.VerifyFile(__FILE__));
+   EXPECT_EQ(sha2big, sha2small);
+   EXPECT_TRUE(sha2big == sha2small);
+   EXPECT_FALSE(sha2big != sha2small);
+
+   HashStringList hashes;
+   EXPECT_TRUE(hashes.empty());
+   EXPECT_TRUE(hashes.push_back(sha2file));
+   EXPECT_FALSE(hashes.empty());
+   EXPECT_EQ(1, hashes.size());
+
+   HashStringList wrong;
+   EXPECT_TRUE(wrong.push_back(sha2wrong));
+   EXPECT_NE(wrong, hashes);
+   EXPECT_FALSE(wrong == hashes);
+   EXPECT_TRUE(wrong != hashes);
+
+   HashStringList similar;
+   EXPECT_TRUE(similar.push_back(sha2big));
+   EXPECT_NE(similar, hashes);
+   EXPECT_FALSE(similar == hashes);
+   EXPECT_TRUE(similar != hashes);
+
+   EXPECT_TRUE(hashes.push_back(sha2big));
+   EXPECT_EQ(2, hashes.size());
+   EXPECT_TRUE(hashes.push_back(sha2small));
+   EXPECT_EQ(2, hashes.size());
+   EXPECT_FALSE(hashes.push_back(sha2wrong));
+   EXPECT_EQ(2, hashes.size());
+   EXPECT_TRUE(hashes.VerifyFile(__FILE__));
+
+   EXPECT_EQ(similar, hashes);
+   EXPECT_TRUE(similar == hashes);
+   EXPECT_FALSE(similar != hashes);
+   similar.clear();
+   EXPECT_TRUE(similar.empty());
+   EXPECT_EQ(0, similar.size());
+   EXPECT_NE(similar, hashes);
+   EXPECT_FALSE(similar == hashes);
+   EXPECT_TRUE(similar != hashes);

 }
 }

+TEST(HashSumsTest, HashStringList)
+{
+   _config->Clear("Acquire::ForceHash");
+
+   HashStringList list;
+   EXPECT_TRUE(list.empty());
+   EXPECT_FALSE(list.usable());
+   EXPECT_EQ(0, list.size());
+   EXPECT_EQ(NULL, list.find(NULL));
+   EXPECT_EQ(NULL, list.find(""));
+   EXPECT_EQ(NULL, list.find("MD5Sum"));
+   EXPECT_EQ(0, list.FileSize());
+
+   // empty lists aren't equal
+   HashStringList list2;
+   EXPECT_FALSE(list == list2);
+   EXPECT_TRUE(list != list2);
+
+   // some hashes don't really contribute to usability
+   list.push_back(HashString("Checksum-FileSize", "29"));
+   EXPECT_FALSE(list.empty());
+   EXPECT_FALSE(list.usable());
+   EXPECT_EQ(1, list.size());
+   EXPECT_EQ(29, list.FileSize());
+
+   Hashes hashes;
+   hashes.Add("The quick brown fox jumps over the lazy dog");
+   list = hashes.GetHashStringList();
+   EXPECT_FALSE(list.empty());
+   EXPECT_TRUE(list.usable());
+   EXPECT_EQ(5, list.size());
+   EXPECT_TRUE(NULL != list.find(NULL));
+   EXPECT_TRUE(NULL != list.find(""));
+   EXPECT_TRUE(NULL != list.find("MD5Sum"));
+   EXPECT_TRUE(NULL != list.find("Checksum-FileSize"));
+   EXPECT_TRUE(NULL == list.find("ROT26"));

 
 

+   _config->Set("Acquire::ForceHash", "MD5Sum");
+   EXPECT_FALSE(list.empty());
+   EXPECT_TRUE(list.usable());
+   EXPECT_EQ(5, list.size());
+   EXPECT_TRUE(NULL != list.find(NULL));
+   EXPECT_TRUE(NULL != list.find(""));
+   EXPECT_TRUE(NULL != list.find("MD5Sum"));
+   EXPECT_TRUE(NULL != list.find("Checksum-FileSize"));
+   EXPECT_TRUE(NULL == list.find("ROT26"));

 
 

+   _config->Set("Acquire::ForceHash", "ROT26");
+   EXPECT_FALSE(list.empty());
+   EXPECT_FALSE(list.usable());
+   EXPECT_EQ(5, list.size());
+   EXPECT_TRUE(NULL == list.find(NULL));
+   EXPECT_TRUE(NULL == list.find(""));
+   EXPECT_TRUE(NULL != list.find("MD5Sum"));
+   EXPECT_TRUE(NULL != list.find("Checksum-FileSize"));
+   EXPECT_TRUE(NULL == list.find("ROT26"));
+
+   _config->Clear("Acquire::ForceHash");
+
+   list2.push_back(*list.find("MD5Sum"));
+   EXPECT_TRUE(list == list2);
+   EXPECT_FALSE(list != list2);
+
+   // introduce a mismatch to the list
+   list2.push_back(HashString("SHA1", "cacecbd74968bc90ea3342767e6b94f46ddbcafc"));
+   EXPECT_FALSE(list == list2);
+   EXPECT_TRUE(list != list2);
+
+   _config->Set("Acquire::ForceHash", "MD5Sum");
+   EXPECT_TRUE(list == list2);
+   EXPECT_FALSE(list != list2);
+
+   _config->Clear("Acquire::ForceHash");
+}