1 files changed, 113 insertions, 0 deletions
diff --git a/spec/lib/gitlab/webpack/manifest_spec.rb b/spec/lib/gitlab/webpack/manifest_spec.rb
new file mode 100644
index 00000000000..1427bdd7d4f
--- /dev/null
+++ b/spec/lib/gitlab/webpack/manifest_spec.rb
@@ -0,0 +1,113 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+require 'json'
+
+RSpec.describe Gitlab::Webpack::Manifest do
+  let(:manifest) do
+    <<-EOF
+      {
+        "errors": [],
+        "assetsByChunkName": {
+          "entry1": [ "entry1.js", "entry1-a.js" ],
+          "entry2": "entry2.js"
+        }
+      }
+    EOF
+  end
+
+  around do |example|
+    Gitlab::Webpack::Manifest.clear_manifest!
+
+    example.run
+
+    Gitlab::Webpack::Manifest.clear_manifest!
+  end
+
+  shared_examples_for "a valid manifest" do
+    it "returns single entry asset paths from the manifest" do
+      expect(Gitlab::Webpack::Manifest.asset_paths("entry2")).to eq(["/public_path/entry2.js"])
+    end
+
+    it "returns multiple entry asset paths from the manifest" do
+      expect(Gitlab::Webpack::Manifest.asset_paths("entry1")).to eq(["/public_path/entry1.js", "/public_path/entry1-a.js"])
+    end
+
+    it "errors on a missing entry point" do
+      expect { Gitlab::Webpack::Manifest.asset_paths("herp") }.to raise_error(Gitlab::Webpack::Manifest::AssetMissingError)
+    end
+  end
+
+  before do
+    # Test that config variables work while we're here
+    allow(Gitlab.config.webpack.dev_server).to receive_messages(host: 'hostname', port: 2000, https: false)
+    allow(Gitlab.config.webpack).to receive(:manifest_filename).and_return('my_manifest.json')
+    allow(Gitlab.config.webpack).to receive(:public_path).and_return('public_path')
+    allow(Gitlab.config.webpack).to receive(:output_dir).and_return('manifest_output')
+  end
+
+  context "with dev server enabled" do
+    before do
+      allow(Gitlab.config.webpack.dev_server).to receive(:enabled).and_return(true)
+
+      stub_request(:get, "http://hostname:2000/public_path/my_manifest.json").to_return(body: manifest, status: 200)
+    end
+
+    describe ".asset_paths" do
+      it_behaves_like "a valid manifest"
+
+      it "errors if we can't find the manifest" do
+        allow(Gitlab.config.webpack).to receive(:manifest_filename).and_return('broken.json')
+        stub_request(:get, "http://hostname:2000/public_path/broken.json").to_raise(SocketError)
+
+        expect { Gitlab::Webpack::Manifest.asset_paths("entry1") }.to raise_error(Gitlab::Webpack::Manifest::ManifestLoadError)
+      end
+
+      describe "webpack errors" do
+        context "when webpack has 'Module build failed' errors in its manifest" do
+          it "errors" do
+            error_manifest = Gitlab::Json.parse(manifest).merge("errors" => [
+              "somethingModule build failed something",
+              "I am an error"
+            ]).to_json
+            stub_request(:get, "http://hostname:2000/public_path/my_manifest.json").to_return(body: error_manifest, status: 200)
+
+            expect { Gitlab::Webpack::Manifest.asset_paths("entry1") }.to raise_error(Gitlab::Webpack::Manifest::WebpackError)
+          end
+        end
+
+        context "when webpack does not have 'Module build failed' errors in its manifest" do
+          it "does not error" do
+            error_manifest = Gitlab::Json.parse(manifest).merge("errors" => ["something went wrong"]).to_json
+            stub_request(:get, "http://hostname:2000/public_path/my_manifest.json").to_return(body: error_manifest, status: 200)
+
+            expect { Gitlab::Webpack::Manifest.asset_paths("entry1") }.not_to raise_error
+          end
+        end
+
+        it "does not error if errors is present but empty" do
+          error_manifest = Gitlab::Json.parse(manifest).merge("errors" => []).to_json
+          stub_request(:get, "http://hostname:2000/public_path/my_manifest.json").to_return(body: error_manifest, status: 200)
+          expect { Gitlab::Webpack::Manifest.asset_paths("entry1") }.not_to raise_error
+        end
+      end
+    end
+  end
+
+  context "with dev server disabled" do
+    before do
+      allow(Gitlab.config.webpack.dev_server).to receive(:enabled).and_return(false)
+      allow(File).to receive(:read).with(::Rails.root.join("manifest_output/my_manifest.json")).and_return(manifest)
+    end
+
+    describe ".asset_paths" do
+      it_behaves_like "a valid manifest"
+
+      it "errors if we can't find the manifest" do
+        allow(Gitlab.config.webpack).to receive(:manifest_filename).and_return('broken.json')
+        allow(File).to receive(:read).with(::Rails.root.join("manifest_output/broken.json")).and_raise(Errno::ENOENT)
+        expect { Gitlab::Webpack::Manifest.asset_paths("entry1") }.to raise_error(Gitlab::Webpack::Manifest::ManifestLoadError)
+      end
+    end
+  end
+end