diff options
Diffstat (limited to 'spec/arel/engines/sql/unit/predicates/equality_spec.rb')
-rw-r--r-- | spec/arel/engines/sql/unit/predicates/equality_spec.rb | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/spec/arel/engines/sql/unit/predicates/equality_spec.rb b/spec/arel/engines/sql/unit/predicates/equality_spec.rb new file mode 100644 index 0000000000..2ab79d7028 --- /dev/null +++ b/spec/arel/engines/sql/unit/predicates/equality_spec.rb @@ -0,0 +1,61 @@ +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 + sql = Equality.new(@attribute1, @attribute2).to_sql + + adapter_is :mysql do + sql.should be_like(%Q{`users`.`id` = `photos`.`user_id`}) + end + + adapter_is_not :mysql do + sql.should be_like(%Q{"users"."id" = "photos"."user_id"}) + end + end + end + + describe 'when relation to a nil value' do + before do + @nil = nil + end + + it "manufactures an is null predicate" do + sql = Equality.new(@attribute1, @nil).to_sql + + adapter_is :mysql do + sql.should be_like(%Q{`users`.`id` IS NULL}) + end + + adapter_is_not :mysql do + sql.should be_like(%Q{"users"."id" IS NULL}) + end + end + end + end + end +end
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