Fixes #3405 - Changed logic for schemes.jsx component to select default scheme when there is no selected scheme. Added test for functionality.

src/core/components/schemes.jsx

@@ -19,8 +19,9 @@ export default class Schemes extends React.Component {
   }
 
   componentWillReceiveProps(nextProps) {
-    if ( this.props.operationScheme && !nextProps.schemes.has(this.props.operationScheme) ) {
-      //fire 'change' event if our selected scheme is no longer an option
+    if ( !this.props.operationScheme || !nextProps.schemes.has(this.props.operationScheme) ) {
+      // if we don't have a selected operationScheme or if our selected scheme is no longer an option,
+      // then fire 'change' event and select the first scheme in the list of options
       this.setScheme(nextProps.schemes.first())
     }
   }

test/components/schemes.js

@@ -0,0 +1,41 @@
+
+/* eslint-env mocha */
+import React from "react"
+import expect, { createSpy } from "expect"
+import { shallow } from "enzyme"
+import { fromJS } from "immutable"
+import Schemes from "components/schemes"
+
+describe("<Schemes/>", function(){
+  it("calls props.specActions.setScheme() when no operationScheme is selected", function(){
+
+    // Given
+    let props = {
+      specActions: {
+        setScheme: createSpy()
+      },
+      schemes: fromJS([
+        "http",
+        "https"
+      ]),
+      operationScheme: undefined,
+      path: "/test",
+      method: "get"
+    }
+    
+    // When
+    let wrapper = shallow(<Schemes {...props}/>)
+
+    // Then operationScheme should default to first scheme in options list
+    expect(props.specActions.setScheme).toHaveBeenCalledWith("http", "/test" , "get")
+
+    // When the operationScheme is no longer in the list of options
+    props.schemes = fromJS([
+      "https"
+    ])
+    wrapper.setProps(props)
+
+    // Then operationScheme should default to first scheme in options list
+    expect(props.specActions.setScheme).toHaveBeenCalledWith("https", "/test", "get")
+  })
+})