Added additional setter methods for select lists

README.md

@@ -169,11 +169,26 @@ setTextAreaValue(element("textarea"), "Sasquatch") //Text area now has value "Sa
 setCheckboxValue(element("input[type=check]"), true) //Checkbox is now checked
 setRadioButton(element("input[type=radio]"), true) //Radio button is now selected
 setSelectValue(element("select"), "Hancock") //Dropdown list now has the value "Hancock" selected
+setSelectIndex(element("select"), 1) //Dropdown list now has the second option selected
+
 ```
 
 These work with any DOM element reference, not just those returned by ng-units selection methods. They can be used 
 in traditional TestBed tests if desired.
 
+#### Select lists and `[ngValue]`
+Using `[ngValue]` for select list option bindings complicates setting a value slightly. The bound values can 
+types other than strings, and consequently the value is not bound to the DOM. This makes determining which option to select more complicated. 
+
+If you know the index of the option you want you can use  `setSelectIndex(element("select"), index)` to select the value
+
+If you have access to a list of all the options you can use `setSelectFromOptions()` to select the value:
+```typescript
+    const listOptions = [{ message: "Hello"}, { message: "Goodbye"}]
+    setSelectFromOptions(element("select"), { message: "Goodbye"}, listOptions)
+```
+
+
 #### Setting component inputs
 Initial values for component inputs can be set prior to component instantiation (so they are properly present at 
 OnInit time) with the test builder method`.setInput()`.

src/dom.spec.ts

@@ -5,6 +5,8 @@ import {
     selectComponents,
     setCheckboxValue,
     setRadioButton,
+    setSelectFromOptions,
+    setSelectIndex,
     setSelectValue,
     setTextAreaValue,
     setTextInputValue,
@@ -119,6 +121,117 @@ describe("DOM", () => {
             expect(subject.selectValue).to.equal("Adios")
         })
 
+
+    })
+
+    describe("setSelectIndex() sets the value of select elements", () => {
+
+        it("when options have value attributes", () => {
+            @Component({
+                selector: "parent",
+                template: `
+                    <select [(ngModel)]="selectValue">
+                        <option></option>
+                        <option value="Hola">Hello</option>
+                        <option value="Adios">Goodbye</option>
+                    </select>
+                `,
+            })
+            class TestComponent {
+                public selectValue = ""
+            }
+            const {subject, subjectElement, fixture} = setupTestModule(TestComponent)
+
+
+            setSelectIndex(subjectElement.querySelector("select"), 2)
+            fixture.detectChanges()
+
+            expect(subject.selectValue).to.equal("Adios")
+        })
+
+        it("when options have ngValue attributes", () => {
+            @Component({
+                selector: "parent",
+                template: `
+                    <select [(ngModel)]="selectValue">
+                        <option [ngValue]="null"></option>
+                        <option [ngValue]="{ message: 'Hola' }">Hello</option>
+                        <option [ngValue]="{ message: 'Adios' }">Goodbye</option>
+                    </select>
+                `,
+            })
+            class TestComponent {
+                public selectValue = null
+            }
+            const {subject, subjectElement, fixture} = setupTestModule(TestComponent)
+
+            setSelectIndex(subjectElement.querySelector("select"), 1)
+            fixture.detectChanges()
+            expect(subject.selectValue).to.deep.equal({ message: "Hola" })
+
+            setSelectIndex(subjectElement.querySelector("select"), 0)
+            fixture.detectChanges()
+            expect(subject.selectValue).to.equal(null)
+        })
+
+    })
+
+    describe("setSelectFromOptions() sets the value of select elements", () => {
+
+        it("when options have ngValue attributes", () => {
+            @Component({
+                selector: "parent",
+                template: `
+                <select [(ngModel)]="selectValue">
+                    <option *ngFor="let option of allOptions" [ngValue]="option">{{option?.label}}</option>
+                </select>
+            `,
+            })
+            class TestComponent {
+                public allOptions = [
+                    null,
+                    { label: "Hello", value: "Hola" },
+                    { bar: "Adios" },
+                ]
+
+                public selectValue = null
+            }
+            const {subject, subjectElement, fixture} = setupTestModule(TestComponent)
+
+
+            setSelectFromOptions(subjectElement.querySelector("select"), { bar: "Adios" }, subject.allOptions)
+            fixture.detectChanges()
+
+            expect(subject.selectValue).to.deep.equal({ bar: "Adios" })
+        })
+
+        it("when options have value attributes", () => {
+            @Component({
+                selector: "parent",
+                template: `
+                <select [(ngModel)]="selectValue">
+                    <option *ngFor="let option of allOptions" value="{{option?.value}}">{{option?.label}}</option>
+                </select>
+            `,
+            })
+            class TestComponent {
+                public allOptions = [
+                    null,
+                    { label: "Hello", value: "Hola" },
+                    { label: "Goodbye", value: "Adios" },
+                ]
+
+                public selectValue = null
+            }
+            const {subject, subjectElement, fixture} = setupTestModule(TestComponent)
+
+
+            setSelectFromOptions(subjectElement.querySelector("select"), { label: "Goodbye", value: "Adios" }, subject.allOptions)
+            fixture.detectChanges()
+
+            expect(subject.selectValue).to.equal("Adios")
+        })
+
     })
 
     it('setRadioButton() sets the value of <input type="radio"> elements', () => {

src/dom.ts

@@ -3,6 +3,7 @@ import {isNil, isString, findIndex} from "lodash"
 import {By} from "@angular/platform-browser"
 import {selectorOf} from "./selector-of"
 import {Type} from "@angular/core"
+import { isEqual } from "lodash"
 
 function doIfElementPresent<T>(element: T | null, action: (item: T) => void) {
     if (isNil(element)) {
@@ -30,6 +31,20 @@ export function setSelectValue(selectBox: Element | null, value: string): void {
     })
 }
 
+export function setSelectIndex(selectBox: Element | null, index: number): void {
+    doIfElementPresent(selectBox, selectBox => {
+        (selectBox as any).selectedIndex = index
+        trigger(selectBox, "change")
+    })
+}
+
+export function setSelectFromOptions(selectBox: Element | null, optionToSelection: any, allOptions: any[]): void {
+    doIfElementPresent(selectBox, selectBox => {
+        (selectBox as any).selectedIndex = findIndex(allOptions, option => isEqual(option, optionToSelection))
+        trigger(selectBox, "change")
+    })
+}
+
 export const setTextAreaValue = setTextInputValue
 
 export function setCheckboxValue(input: Element | null, checked: boolean): void {