Merge pull request #400 from felixbuenemann/case-node

Implement CASE Conditional Expression

1 files changed, 82 insertions, 0 deletions

diff --git a/test/nodes/test_case.rb b/test/nodes/test_case.rb
new file mode 100644
index 0000000000..a813ec7e69
--- /dev/null
+++ b/test/nodes/test_case.rb
@@ -0,0 +1,82 @@
+require 'helper'
+
+module Arel
+  module Nodes
+    describe 'Case' do
+      describe '#initialize' do
+        it 'sets case expression from first argument' do
+          node = Case.new 'foo'
+
+          assert_equal 'foo', node.case
+        end
+
+        it 'sets default case from second argument' do
+          node = Case.new nil, 'bar'
+
+          assert_equal 'bar', node.default
+        end
+      end
+
+      describe '#clone' do
+        it 'clones case, conditions and default' do
+          foo = Nodes.build_quoted 'foo'
+
+          node = Case.new
+          node.case = foo
+          node.conditions = [When.new(foo, foo)]
+          node.default = foo
+
+          dolly = node.clone
+
+          assert_equal dolly.case, node.case
+          refute_same  dolly.case, node.case
+
+          assert_equal dolly.conditions, node.conditions
+          refute_same  dolly.conditions, node.conditions
+
+          assert_equal dolly.default, node.default
+          refute_same  dolly.default, node.default
+        end
+      end
+
+      describe 'equality' do
+        it 'is equal with equal ivars' do
+          foo = Nodes.build_quoted 'foo'
+          one = Nodes.build_quoted 1
+          zero = Nodes.build_quoted 0
+
+          case1 = Case.new foo
+          case1.conditions = [When.new(foo, one)]
+          case1.default = Else.new zero
+
+          case2 = Case.new foo
+          case2.conditions = [When.new(foo, one)]
+          case2.default = Else.new zero
+
+          array = [case1, case2]
+
+          assert_equal 1, array.uniq.size
+        end
+
+        it 'is not equal with different ivars' do
+          foo = Nodes.build_quoted 'foo'
+          bar = Nodes.build_quoted 'bar'
+          one = Nodes.build_quoted 1
+          zero = Nodes.build_quoted 0
+
+          case1 = Case.new foo
+          case1.conditions = [When.new(foo, one)]
+          case1.default = Else.new zero
+
+          case2 = Case.new foo
+          case2.conditions = [When.new(bar, one)]
+          case2.default = Else.new zero
+
+          array = [case1, case2]
+
+          assert_equal 2, array.uniq.size
+        end
+      end
+    end
+  end
+end