Add more versions to unit test

Technical Change Notes
======================

- Handle a bug in hoe with later versions of Ruby and/or Psych.

1 files changed, 47 insertions, 43 deletions

diff --git a/History.md b/History.md
index 063387b..1c81d9f 100644
--- a/History.md
+++ b/History.md
@@ -1,15 +1,19 @@
 # History
 
+## NEXT / 2021-12-14
+
+- Updated the CI configuration and monkey-patch Hoe.
+
 ## 1.4.4 / 2020-07-01
 
 - Fixed an issue reported by Jun Aruga in the Diff::LCS::Ldiff binary text
-  detection. [#44][]
+  detection. [#44]
 - Fixed a theoretical issue reported by Jun Aruga in Diff::LCS::Hunk to raise
-  a more useful exception. [#43][]
+  a more useful exception. [#43]
 - Added documentation that should address custom object issues as reported in
-  [#35][].
+  [#35].
 
-- Fixed more diff errors, in part reported in [#65][].
+- Fixed more diff errors, in part reported in [#65].
 
   - The use of `Numeric#abs` is incorrect in `Diff::LCS::Block#diff_size`.
     The diff size _must_ be accurate for correct change placement.
@@ -49,52 +53,52 @@
     parameters, but only a trailing options hash.
   - Made the use of `psych` dependent on `RUBY_VERSION >= 1.9`.
 
-  Resolves [#63][].
+  Resolves [#63].
 
 ## 1.4.2 / 2020-06-23
 
-- Camille Drapier fixed a small issue with RuboCop configuration. [#59][]
+- Camille Drapier fixed a small issue with RuboCop configuration. [#59]
 - Applied another fix (and unit test) to fix an issue for the Chef team.
-  [#60][], [#61][]
+  [#60], [#61]
 
 ## 1.4.1 / 2020-06-23
 
-- Fix an issue where diff sizes could be negative, and they should be. [#57][],
-  [#58][]
+- Fix an issue where diff sizes could be negative, and they should be. [#57],
+  [#58]
 
 ## 1.4 / 2020-06-23
 
 - Ruby versions lower than 2.4 are soft-deprecated and will not be run as
   part of the CI process any longer.
 - Akinora MUSHA (knu) added the ability for Diff::LCS::Change objects to be
-  implicitly treated arrays. Originally provided as pull request [#47][],
-  but it introduced a number of test failures as documented in [#48][], and
-  remediation of Diff::LCS itself was introduced in [#49][].
-- Resolved [#5][] with some tests comparing output from `system` calls to
-  `bin/ldiff` with some pre-generated output. Resolved [#6][] with these
+  implicitly treated arrays. Originally provided as pull request [#47],
+  but it introduced a number of test failures as documented in [#48], and
+  remediation of Diff::LCS itself was introduced in [#49].
+- Resolved [#5] with some tests comparing output from `system` calls to
+  `bin/ldiff` with some pre-generated output. Resolved [#6] with these
   tests.
 - Resolved a previously undetected `bin/ldiff` issue with `--context` output
   not matching `diff --context` output.
 - Resolved an issue with later versions of Ruby not working with an `OptParse`
   specification of `Numeric`; this has been changed to `Integer`.
-- Brandon Fish added truffleruby in [#52][].
-- Fixed two missing classes as reported in [#53][].
+- Brandon Fish added truffleruby in [#52].
+- Fixed two missing classes as reported in [#53].
 
 ## 1.3 / 2017-01-18
 
 - Bugs fixed:
 
-  - Fixed an error for bin/ldiff --version. Fixes issue [#21][].
+  - Fixed an error for bin/ldiff --version. Fixes issue [#21].
   - Force Diff::LCS::Change and Diff::LCS::ContextChange to only perform
     equality comparisons against themselves. Provided by Kevin Mook in
-    pull request [#29][].
+    pull request [#29].
   - Fix tab expansion in htmldiff, provided by Mark Friedgan in
-    pull request [#25][].
-  - Silence Ruby 2.4 Fixnum deprecation warnings. Fixxues issue [#38][] and
-    [pull request#36][].
-  - Ensure that test dependencies are loaded properly. Fixes issue [#33][]
-    and pull request [#34][].
-  - Fix issue [#1][] with incorrect intuition of patch direction. Tentative
+    pull request [#25].
+  - Silence Ruby 2.4 Fixnum deprecation warnings. Fixxues issue [#38] and
+    [pull request#36].
+  - Ensure that test dependencies are loaded properly. Fixes issue [#33]
+    and pull request [#34].
+  - Fix issue [#1] with incorrect intuition of patch direction. Tentative
     fix, but the previous failure cases pass now.
 
 - Tooling changes:
@@ -113,7 +117,7 @@
 - Bugs fixed:
 
   - Comparing arrays flattened them too far, especially with
-    Diff::LCS.sdiff. Fixed by Josh Bronson in pull request [#23][].
+    Diff::LCS.sdiff. Fixed by Josh Bronson in pull request [#23].
 
 ## 1.2.4 / 2013-04-20
 
@@ -121,9 +125,9 @@
 
   - A bug was introduced after 1.1.3 when pruning common sequences at the
     start of comparison. Paul Kunysch (@pck) fixed this in
-    pull request [#18][]. Thanks!
+    pull request [#18]. Thanks!
 
-  - The Rubinius (1.9 mode) bug in [rubinius/rubinius#2268][] has been
+  - The Rubinius (1.9 mode) bug in [rubinius/rubinius#2268] has been
     fixed by the Rubinius team two days after it was filed. Thanks for
     fixing this so quickly!
 
@@ -135,12 +139,12 @@
 
   - The new encoding detection for diff output generation (added in 1.2.2)
     introduced a bug if the left side of the comparison was the empty set.
-    Originally found in [rspec/rspec-expectations#238][] and
-    [rspec/rspec-expectations#239][]. Jon Rowe developed a reasonable
+    Originally found in [rspec/rspec-expectations#238] and
+    [rspec/rspec-expectations#239]. Jon Rowe developed a reasonable
     heuristic (left side, right side, empty string literal) to avoid this
     bug.
   - There is a known issue with Rubinius in 1.9 mode reported in
-    [rubinius/rubinius#2268][] and demonstrated in the Travis CI builds.
+    [rubinius/rubinius#2268] and demonstrated in the Travis CI builds.
     For all other tested platforms, diff-lcs is considered stable. As soon
     as a suitably small test-case can be created for the Rubinius team to
     examine, this will be added to the Rubinius issue around this.
@@ -152,8 +156,8 @@
   - Diff::LCS::Hunk could not properly generate a difference for comparison
     sets that are not US-ASCII-compatible because of the use of literal
     regular expressions and strings. Jon Rowe found this in
-    [rspec/rspec-expectations#219][] and provided a first pass
-    implementation in pull request [#15][]. I've reworked it because of
+    [rspec/rspec-expectations#219] and provided a first pass
+    implementation in pull request [#15]. I've reworked it because of
     test failures in Rubinius when running in Ruby 1.9 mode. This coerces
     the added values to the encoding of the old dataset (as determined by
     the first piece of the old dataset).
@@ -163,10 +167,10 @@
 
 - Bugs Fixed:
 
-  - As seen in [rspec/rspec-expectations#200][], the release of
+  - As seen in [rspec/rspec-expectations#200], the release of
     Diff::LCS 1.2 introduced an unnecessary public API change to
     Diff::LCS::Hunk (see the change at
-    [rspec/rspec-expectations@3d6fc82c][] for details). The new method name
+    [rspec/rspec-expectations@3d6fc82c] for details). The new method name
     (and behaviour) is more correct, but I should not have renamed the
     function or should have at least provided an alias. This release
     restores Diff::LCS::Hunk#unshift as an alias to #merge. Note that the
@@ -183,30 +187,30 @@
 
 - Bugs Fixed:
 
-  - Fixed issue [#1][] patch direction detection.
-  - Resolved issue [#2][] by handling `string[string.size, 1]` properly (it
+  - Fixed issue [#1] patch direction detection.
+  - Resolved issue [#2] by handling `string[string.size, 1]` properly (it
     returns `""` not `nil`).
   - Michael Granger (ged) fixed an implementation error in
-    Diff::LCS::Change and added specs in pull request [#8][]. Thanks!
+    Diff::LCS::Change and added specs in pull request [#8]. Thanks!
   - Made the code auto-testable.
   - Vít Ondruch (voxik) provided the latest version of the GPL2 license
-    file in pull request [#10][]. Thanks!
+    file in pull request [#10]. Thanks!
   - Fixed a documentation issue with the includable versions of #patch! and
     #unpatch! where they implied that they would replace the original
     value. Given that Diff::LCS.patch always returns a copy, the
     documentation was incorrect and has been corrected. To provide the
     behaviour that was originally documented, two new methods were added to
-    provide this behaviour. Found by scooter-dangle in issue [#12][].
+    provide this behaviour. Found by scooter-dangle in issue [#12].
     Thanks!
 
 - Code Style Changes:
 
   - Removed trailing spaces.
   - Calling class methods using `.` instead of `::`.
-  - Vít Ondruch (voxik) removed unnecessary shebangs in pull request [#9][].
+  - Vít Ondruch (voxik) removed unnecessary shebangs in pull request [#9].
     Thanks!
   - Kenichi Kamiya (kachick) removed some warnings of an unused variable in
-    lucky pull request [#13][]. Thanks!
+    lucky pull request [#13]. Thanks!
   - Embarked on a major refactoring to make the files a little more
     manageable and understand the code on a deeper level.
   - Adding to http://travis-ci.org.
@@ -221,8 +225,8 @@
 - Bugs fixed:
 
   - Eliminated the explicit use of RubyGems in both bin/htmldiff and
-    bin/ldiff. Resolves issue [#4][].
-  - Eliminated Ruby warnings. Resolves issue [#3][].
+    bin/ldiff. Resolves issue [#4].
+  - Eliminated Ruby warnings. Resolves issue [#3].
 
 ## 1.1.2 / 2004-10-20