Add tests for AuthType

.babelrc

@@ -0,0 +1,7 @@
+{
+    "env": {
+        "test": {
+            "presets": [["@babel/preset-env"]]
+        }
+    }
+}

package.json

@@ -15,7 +15,7 @@
     "start": "plugin-helpers start",
     "test:server": "plugin-helpers test:server",
     "test:browser": "./node_modules/.bin/jest --clearCache && ./node_modules/.bin/jest --config ./tests/jest.config.js",
-    "test:jest": "../../kibana/node_modules/.bin/jest --config ./test/jest.config.js",
+    "test:jest": "./node_modules/.bin/jest --config tests/jest.config.js",
     "build": "plugin-helpers build"
   },
   "dependencies": {

tests/AuthType.test.js

@@ -0,0 +1,35 @@
+import AuthType  from "../lib/auth/types/AuthType";
+
+const mockServer = {
+    config: () => { 
+        return {
+            get: () => {
+                return null;
+            }
+        }
+    } 
+}
+
+describe('AuthType tests', () => {
+    it('should contain only security_impersonate_as when no additional headers are passed', () => {
+        // act
+        var authType = new AuthType(null, mockServer, null, null, null, {});
+        // assert
+        expect(authType.allowedAdditionalAuthHeaders).toHaveLength(1);
+        expect(authType.allowedAdditionalAuthHeaders).toContain("security_impersonate_as");
+    });
+
+    it('should add whitelisted headers when present', () => {
+        // arrange
+        const mockEsConfig = {
+            requestHeadersWhitelist: ["test-header-1", "test-header-2"]
+        }
+        // act
+        var authType = new AuthType(null, mockServer, null, null, null, mockEsConfig);
+        // assert
+        expect(authType.allowedAdditionalAuthHeaders).toHaveLength(3);
+        expect(authType.allowedAdditionalAuthHeaders).toContain("security_impersonate_as");
+        expect(authType.allowedAdditionalAuthHeaders).toContain("test-header-1");
+        expect(authType.allowedAdditionalAuthHeaders).toContain("test-header-2")
+    });
+});