update claimed as tax dependent

lib/aca_entities/atp/functions/build_application.rb

@@ -365,7 +365,7 @@ def applicant_hash
             is_filing_as_head_of_household: tax_returns_hash[:is_head_of_household] ? true : false,
             is_joint_tax_filing: tax_returns_hash[:joint_tax_filing_status],
             is_claimed_as_tax_dependent: tax_returns_hash[:tax_dependents].nil? ? nil : tax_returns_hash[:tax_dependents].include?(@applicant_identifier), # default value
-            claimed_as_tax_dependent_by: @primary_applicant_identifier, # default value to primary
+            claimed_as_tax_dependent_by: @primary_applicant_identifier == @applicant_identifier ? nil : @primary_applicant_identifier,
             student: other_questions[:student],
             is_refugee: nil, # default value
             is_trafficking_victim: nil, # default value

spec/aca_entities/atp/functions/build_application_spec.rb

@@ -175,4 +175,20 @@
       expect(@result[:applicants][0][:deductions].last[:amount]).to eq(100)
     end
   end
+
+  context "is_claimed_as_tax_dependent_by" do
+
+    before do
+      @result = subject.first
+    end
+
+    it "does not populate is claimed as tax dependent by for the primary applicant" do
+      expect(@result[:applicants][0][:claimed_as_tax_dependent_by]).to be nil
+    end
+
+    it "populates is_claimed_as_tax_dependent_by for non-primary applicants" do
+      binding.irb
+      expect(@result[:applicants][1][:claimed_as_tax_dependent_by]).to eql(@result[:applicants][0][:person_hbx_id])
+    end
+  end
 end