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diff --git a/spec/unit/secret_fetcher/hashi_vault_spec.rb b/spec/unit/secret_fetcher/hashi_vault_spec.rb
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+#
+# Author:: Marc Paradise <marc@chef.io>
+# Copyright:: Copyright (c) Chef Software Inc.
+# License:: Apache License, Version 2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+#
+
+require_relative "../../spec_helper"
+require "chef/secret_fetcher/hashi_vault"
+
+describe Chef::SecretFetcher::HashiVault do
+  let(:node) { {} }
+  let(:run_context) { double("run_context", node: node) }
+  let(:fetcher_config) { {} }
+  let(:fetcher) {
+    Chef::SecretFetcher::HashiVault.new( fetcher_config, run_context )
+  }
+
+  context "when validating HashiVault provided configuration" do
+    context "and role_name is not provided" do
+      let(:fetcher_config) { { vault_addr: "vault.example.com" } }
+      it "raises ConfigurationInvalid" do
+        expect { fetcher.validate! }.to raise_error(Chef::Exceptions::Secret::ConfigurationInvalid)
+      end
+    end
+    context "and vault_addr is not provided" do
+      let(:fetcher_config) { { role_name: "example-role" } }
+      it "raises ConfigurationInvalid" do
+        expect { fetcher.validate! }.to raise_error(Chef::Exceptions::Secret::ConfigurationInvalid)
+      end
+    end
+  end
+
+  context "when all required config is provided" do
+    let(:fetcher_config) { { vault_addr: "vault.example.com", role_name: "example-role" } }
+    it "obtains a token via AWS IAM auth" do
+      auth_stub = double("vault auth", aws_iam: nil)
+      allow(Aws::InstanceProfileCredentials).to receive(:new).and_return double("credentials")
+      allow(Vault).to receive(:auth).and_return(auth_stub)
+      fetcher.validate!
+
+    end
+  end
+end
+