diff --git a/spec/fixtures/uscore311.tgz b/spec/fixtures/uscore311.tgz
new file mode 100644
index 000000000..a9d256ca3
Binary files /dev/null and b/spec/fixtures/uscore311.tgz differ
diff --git a/spec/inferno/dsl/ig_spec.rb b/spec/inferno/dsl/ig_spec.rb
new file mode 100644
index 000000000..cc7b3b167
--- /dev/null
+++ b/spec/inferno/dsl/ig_spec.rb
@@ -0,0 +1,39 @@
+RSpec.describe Inferno::DSL::IG do
+  let(:uscore3_package) { File.expand_path('../../fixtures/uscore311.tgz', __dir__) }
+
+  describe '#from_file' do
+    it 'loads an IG from file' do
+      ig = described_class.from_file(uscore3_package)
+
+      # For each artifact type in the IG, check:
+      # the right number are loaded,
+      # they're all the expected type,
+      # and spot check a couple IDs
+
+      # https://www.hl7.org/fhir/us/core/STU3.1.1/profiles.html
+      expect(ig.profiles.length).to eq(26)
+      expect(ig.profiles.map(&:resourceType).uniq).to eq(['StructureDefinition'])
+      expect(ig.profiles.map(&:id)).to include('us-core-patient', 'us-core-condition',
+                                               'head-occipital-frontal-circumference-percentile')
+
+      expect(ig.extensions.length).to eq(4)
+      expect(ig.extensions.map(&:resourceType).uniq).to eq(['StructureDefinition'])
+      expect(ig.extensions.map(&:type).uniq).to eq(['Extension'])
+      expect(ig.extensions.map(&:id)).to include('us-core-race', 'us-core-ethnicity')
+
+      # https://www.hl7.org/fhir/us/core/STU3.1.1/terminology.html
+      expect(ig.value_sets.length).to eq(32)
+      expect(ig.value_sets.map(&:resourceType).uniq).to eq(['ValueSet'])
+      expect(ig.value_sets.map(&:id)).to include('us-core-usps-state', 'simple-language')
+
+      # https://www.hl7.org/fhir/us/core/STU3.1.1/searchparameters.html
+      expect(ig.search_params.length).to eq(74)
+      expect(ig.search_params.map(&:resourceType).uniq).to eq(['SearchParameter'])
+      expect(ig.search_params.map(&:id)).to include('us-core-patient-name', 'us-core-encounter-id')
+
+      # https://www.hl7.org/fhir/us/core/STU3.1.1/all-examples.html
+      expect(ig.examples.length).to eq(84)
+      expect(ig.examples.map(&:id)).to include('child-example', 'self-tylenol')
+    end
+  end
+end
diff --git a/spec/inferno/utils/ig_downloader_spec.rb b/spec/inferno/utils/ig_downloader_spec.rb
index 2e77e33ae..dc0cfaee4 100644
--- a/spec/inferno/utils/ig_downloader_spec.rb
+++ b/spec/inferno/utils/ig_downloader_spec.rb
@@ -76,6 +76,16 @@ def with_temp_path(name)
           expect(File.read(temp_path)).to eq(package_binary)
         end
       end
+
+      it 'successfully downloads package to custom path' do
+        stub_request(:get, 'https://packages.fhir.org/hl7.fhir.us.udap-security/-/hl7.fhir.us.udap-security-1.0.0.tgz')
+          .to_return(body: package_binary)
+
+        with_temp_path('ig-downloader-canonical') do |temp_path|
+          ig_downloader.load_ig(canonical, nil, { verbose: false }, temp_path)
+          expect(File.read(temp_path)).to eq(package_binary)
+        end
+      end
     end
   end