(#20200) Add a recursive merge function.

Issue #20200 notes that the merge function does not
support nested hashes.

To prevent unintended side effects with changing merge,
add a deep_merge function instead.

1 files changed, 77 insertions, 0 deletions

diff --git a/spec/unit/puppet/parser/functions/deep_merge_spec.rb b/spec/unit/puppet/parser/functions/deep_merge_spec.rb
new file mode 100644
index 0000000..fffb7f7
--- /dev/null
+++ b/spec/unit/puppet/parser/functions/deep_merge_spec.rb
@@ -0,0 +1,77 @@
+#! /usr/bin/env ruby -S rspec
+
+require 'spec_helper'
+
+describe Puppet::Parser::Functions.function(:deep_merge) do
+  let(:scope) { PuppetlabsSpec::PuppetInternals.scope }
+
+  describe 'when calling deep_merge from puppet' do
+    it "should not compile when no arguments are passed" do
+      pending("Fails on 2.6.x, see bug #15912") if Puppet.version =~ /^2\.6\./
+      Puppet[:code] = '$x = deep_merge()'
+      expect {
+        scope.compiler.compile
+      }.to raise_error(Puppet::ParseError, /wrong number of arguments/)
+    end
+
+    it "should not compile when 1 argument is passed" do
+      pending("Fails on 2.6.x, see bug #15912") if Puppet.version =~ /^2\.6\./
+      Puppet[:code] = "$my_hash={'one' => 1}\n$x = deep_merge($my_hash)"
+      expect {
+        scope.compiler.compile
+      }.to raise_error(Puppet::ParseError, /wrong number of arguments/)
+    end
+  end
+
+  describe 'when calling deep_merge on the scope instance' do
+    it 'should require all parameters are hashes' do
+      expect { new_hash = scope.function_deep_merge([{}, '2'])}.to raise_error(Puppet::ParseError, /unexpected argument type String/)
+      expect { new_hash = scope.function_deep_merge([{}, 2])}.to raise_error(Puppet::ParseError, /unexpected argument type Fixnum/)
+    end
+
+    it 'should accept empty strings as puppet undef' do
+      expect { new_hash = scope.function_deep_merge([{}, ''])}.not_to raise_error(Puppet::ParseError, /unexpected argument type String/)
+    end
+
+    it 'should be able to deep_merge two hashes' do
+      new_hash = scope.function_deep_merge([{'one' => '1', 'two' => '1'}, {'two' => '2', 'three' => '2'}])
+      new_hash['one'].should   == '1'
+      new_hash['two'].should   == '2'
+      new_hash['three'].should == '2'
+    end
+
+    it 'should deep_merge multiple hashes' do
+      hash = scope.function_deep_merge([{'one' => 1}, {'one' => '2'}, {'one' => '3'}])
+      hash['one'].should == '3'
+    end
+
+    it 'should accept empty hashes' do
+      scope.function_deep_merge([{},{},{}]).should == {}
+    end
+
+    it 'should deep_merge subhashes' do
+      hash = scope.function_deep_merge([{'one' => 1}, {'two' => 2, 'three' => { 'four' => 4 } }])
+      hash['one'].should == 1
+      hash['two'].should == 2
+      hash['three'].should == { 'four' => 4 }
+    end
+
+    it 'should append to subhashes' do
+      hash = scope.function_deep_merge([{'one' => { 'two' => 2 } }, { 'one' => { 'three' => 3 } }])
+      hash['one'].should == { 'two' => 2, 'three' => 3 }
+    end
+
+    it 'should append to subhashes 2' do
+      hash = scope.function_deep_merge([{'one' => 1, 'two' => 2, 'three' => { 'four' => 4 } }, {'two' => 'dos', 'three' => { 'five' => 5 } }])
+      hash['one'].should == 1
+      hash['two'].should == 'dos'
+      hash['three'].should == { 'four' => 4, 'five' => 5 }
+    end
+
+    it 'should append to subhashes 3' do
+      hash = scope.function_deep_merge([{ 'key1' => { 'a' => 1, 'b' => 2 }, 'key2' => { 'c' => 3 } }, { 'key1' => { 'b' => 99 } }])
+      hash['key1'].should == { 'a' => 1, 'b' => 99 }
+      hash['key2'].should == { 'c' => 3 }
+    end
+  end
+end