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Diffstat (limited to 'spec/arel/unit/predicates/equality_spec.rb')
| -rw-r--r-- | spec/arel/unit/predicates/equality_spec.rb | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/spec/arel/unit/predicates/equality_spec.rb b/spec/arel/unit/predicates/equality_spec.rb new file mode 100644 index 0000000000..8a58ba3096 --- /dev/null +++ b/spec/arel/unit/predicates/equality_spec.rb @@ -0,0 +1,49 @@ +require File.join(File.dirname(__FILE__), '..', '..', '..', 'spec_helper') + +module Arel + describe Equality do + before do + @relation1 = Table.new(:users) + @relation2 = Table.new(:photos) + @attribute1 = @relation1[:id] + @attribute2 = @relation2[:user_id] + end + + describe '==' do + it "obtains if attribute1 and attribute2 are identical" do + Equality.new(@attribute1, @attribute2).should == Equality.new(@attribute1, @attribute2) + Equality.new(@attribute1, @attribute2).should_not == Equality.new(@attribute1, @attribute1) + end + + it "obtains if the concrete type of the predicates are identical" do + Equality.new(@attribute1, @attribute2).should_not == Binary.new(@attribute1, @attribute2) + end + + it "is commutative on the attributes" do + Equality.new(@attribute1, @attribute2).should == Equality.new(@attribute2, @attribute1) + end + end + + describe '#to_sql' do + describe 'when relating to a non-nil value' do + it "manufactures an equality predicate" do + Equality.new(@attribute1, @attribute2).to_sql.should be_like(" + `users`.`id` = `photos`.`user_id` + ") + end + end + + describe 'when relation to a nil value' do + before do + @nil = nil + end + + it "manufactures an is null predicate" do + Equality.new(@attribute1, @nil).to_sql.should be_like(" + `users`.`id` IS NULL + ") + end + end + end + end +end
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