diff --git a/Library/Homebrew/test/cask/cask_loader/from_api_loader_spec.rb b/Library/Homebrew/test/cask/cask_loader/from_api_loader_spec.rb
new file mode 100644
index 0000000000..db8a16dcaa
--- /dev/null
+++ b/Library/Homebrew/test/cask/cask_loader/from_api_loader_spec.rb
@@ -0,0 +1,138 @@
+# typed: false
+# frozen_string_literal: true
+
+describe Cask::CaskLoader::FromAPILoader, :cask do
+  alias_matcher :be_able_to_load, :be_can_load
+
+  shared_context "with API setup" do |new_token|
+    let(:token) { new_token }
+    let(:cask_from_source) { Cask::CaskLoader.load(token) }
+    let(:cask_json) do
+      hash = cask_from_source.to_hash_with_variations
+      json = JSON.pretty_generate(hash)
+      JSON.parse(json)
+    end
+    let(:casks_from_api_hash) { { cask_json["token"] => cask_json.except("token") } }
+    let(:api_loader) { described_class.new(token, from_json: cask_json) }
+
+    before do
+      allow(Homebrew::API::Cask)
+        .to receive(:all_casks)
+        .and_return(casks_from_api_hash)
+    end
+  end
+
+  describe ".can_load?" do
+    include_context "with API setup", "test-opera"
+
+    context "when not using the API" do
+      before do
+        allow(Homebrew::EnvConfig)
+          .to receive(:install_from_api?)
+          .and_return(false)
+      end
+
+      it "returns false" do
+        expect(described_class).not_to be_able_to_load(token)
+      end
+    end
+
+    context "when using the API" do
+      before do
+        allow(Homebrew::EnvConfig)
+          .to receive(:install_from_api?)
+          .and_return(true)
+      end
+
+      it "returns true for valid token" do
+        expect(described_class).to be_able_to_load(token)
+      end
+
+      it "returns true for valid full name" do
+        expect(described_class).to be_able_to_load("homebrew/cask/#{token}")
+      end
+
+      it "returns false for full name with invalid tap" do
+        expect(described_class).not_to be_able_to_load("homebrew/cask-versions/#{token}")
+      end
+    end
+  end
+
+  describe "#load" do
+    shared_examples "loads from fetched source" do |cask_token|
+      include_context "with API setup", cask_token
+      let(:content_loader) { instance_double(Cask::CaskLoader::FromContentLoader) }
+
+      it "fetches cask source from API" do
+        expect(Homebrew::API::Cask).to receive(:fetch_source).once
+        expect(Cask::CaskLoader::FromContentLoader)
+          .to receive(:new).once
+          .and_return(content_loader)
+        expect(content_loader).to receive(:load).once
+
+        api_loader.load(config: nil)
+      end
+    end
+
+    context "with a preflight stanza" do
+      include_examples "loads from fetched source", "with-preflight"
+    end
+
+    context "with an uninstall-preflight stanza" do
+      include_examples "loads from fetched source", "with-uninstall-preflight"
+    end
+
+    context "with a postflight stanza" do
+      include_examples "loads from fetched source", "with-postflight"
+    end
+
+    context "with an uninstall-postflight stanza" do
+      include_examples "loads from fetched source", "with-uninstall-postflight"
+    end
+
+    context "with a language stanza" do
+      include_examples "loads from fetched source", "with-languages"
+    end
+
+    shared_examples "loads from API" do |cask_token|
+      include_context "with API setup", cask_token
+      let(:cask_from_api) { api_loader.load(config: nil) }
+
+      it "loads from JSON API" do
+        expect(Homebrew::API::Cask).not_to receive(:fetch_source)
+        expect(Cask::CaskLoader::FromContentLoader).not_to receive(:new)
+
+        expect(cask_from_api).to be_a(Cask::Cask)
+        expect(cask_from_api.token).to eq(cask_token)
+      end
+    end
+
+    context "with a binary stanza" do
+      include_examples "loads from API", "with-binary"
+    end
+
+    context "with cask dependencies" do
+      include_examples "loads from API", "with-depends-on-cask-multiple"
+    end
+
+    context "with formula dependencies" do
+      include_examples "loads from API", "with-depends-on-formula-multiple"
+    end
+
+    context "with macos dependencies" do
+      include_examples "loads from API", "with-depends-on-macos-array"
+    end
+
+    context "with an installer stanza" do
+      include_examples "loads from API", "with-installer-script"
+    end
+
+    context "with uninstall stanzas" do
+      include_examples "loads from API", "with-uninstall-multi"
+    end
+
+    context "with a zap stanza" do
+      include_examples "loads from API", "with-zap"
+    end
+  end
+end