minor: forms started!

src/pages/concepts/views.md

@@ -2798,6 +2798,160 @@ export default class MyCardViewController extends AbstractViewController<Card> {
 </details>
 
 
+## Rendering Forms
+
+`Forms`, like all other components, are render in the `CardSection` of your `Card`. You will rely heavily on the `formAssert` utility for testing. Before getting too deep, it'll be helpful to understand some [`Schema`](../schemas) basics.
+
+### Rendering a Form
+
+<details>
+<summary><strong>Test 1</strong>: Assert form is rendered in your card</summary>
+
+```ts
+import { AbstractSpruceFixtureTest } from '@sprucelabs/spruce-test-fixtures'
+import { formAssert } from '@sprucelabs/heartwood-view-controllers'
+
+export default class MyCardTest extends AbstractSpruceFixtureTest {
+    @test()
+    protected static async rendersACard() {
+        const vc = this.views.Controller('theatre.jump-to-card', {})
+        formAssert.cardRendersForm(vc)
+    }
+}
+```
+</details>
+
+<details>
+<summary><strong>Production 1</strong>: Render an empty form in your card</summary>
+
+This is a big first step, but pay attention to a few things:
+
+1. You construct your form using the `buildForm` utility for better typing.
+2. The `FormViewController` interface is a generic, so it'll take the type of your `Schema` to enable advanced typing.
+3. You render your `Form` into the `form` property of your `CardSection`.
+
+```ts
+import {
+    AbstractViewController,
+    ViewControllerOptions,
+    Card,
+    CardViewController,
+    buildForm,
+    FormViewController,
+} from '@sprucelabs/heartwood-view-controllers'
+import { buildSchema } from '@sprucelabs/schema'
+
+export default class MyCardViewController extends AbstractViewController<Card> {
+    public static id = 'my-card'
+    private cardVc: CardViewController
+    private formVc: FormViewController<MyFormSchema>
+
+    public constructor(options: ViewControllerOptions) {
+        super(options)
+
+        this.formVc = this.Controller(
+            'form',
+            buildForm({
+                schema: myFormSchema,
+                sections: [],
+            })
+        )
+        this.cardVc = this.Controller('card', {
+            body: {
+                sections: [
+                    {
+                        form: this.formVc.render(),
+                    },
+                ],
+            },
+        })
+    }
+
+    public render() {
+        return this.cardVc.render()
+    }
+}
+
+const myFormSchema = buildSchema({
+    id: 'jumpToForm',
+    fields: {},
+})
+
+type MyFormSchema = typeof myFormSchema
+
+```
+
+> **Note**: You will rely on `buildForm` to get better typing while constructing your form.
+
+</details>
+
+<details>
+<summary><strong>Test 2a</strong>: Asserting desired fields are rendered</summary>
+
+Our goal is to check that a desired field is being rendered, but first we'll get blocked by needing to expose our `formVc`. We'll do that using a test double.
+
+```ts
+import { AbstractSpruceFixtureTest } from '@sprucelabs/spruce-test-fixtures'
+import { formAssert } from '@sprucelabs/heartwood-view-controllers'
+
+export default class MyCardTest extends AbstractSpruceFixtureTest {
+    @test()
+    protected static async rendersACard() {
+        const vc = this.views.Controller('eightbitstories.my-card', {})
+        formAssert.cardRendersForm(vc)
+    }
+
+    @test()
+    protected static async rendersExpectedFields() {
+        const vc = this.views.Controller('eightbitstories.my-card', {})
+        formAssert.formRendersFields(vc.getForm(), ['destination'])
+    }
+}
+
+```
+
+> **Note**: You should see an error that `getForm()` doesn't exist. We'll create a `Spy` to fix that.
+
+</details>
+
+<details>
+<summary><strong>Test 2b</strong>: Create a `Spy` for `MyCardViewController`</summary>
+
+```ts
+import { AbstractSpruceFixtureTest } from '@sprucelabs/spruce-test-fixtures'
+import { formAssert } from '@sprucelabs/heartwood-view-controllers'
+import MyCardViewController from '../../viewControllers/MyCardViewController'
+
+export default class MyCardTest extends AbstractSpruceFixtureTest {
+    @test()
+    protected static async rendersACard() {
+        const vc = this.views.Controller('eightbitstories.my-card', {})
+        formAssert.cardRendersForm(vc)
+    }
+
+    @test()
+    protected static async rendersExpectedFields() {
+        this.views.setController('eightbitstories.my-card', SpyMyCard)
+        const vc = this.views.Controller('eightbitstories.my-card', {}) as SpyMyCard
+        formAssert.formRendersFields(vc.getForm(), ['field1','field2'])
+    }
+}
+
+class SpyMyCard extends MyCardViewController {
+    public getForm() {
+        return this.formVc
+    }
+}
+
+```
+
+> **Note**: If you are following along, you will get a type error because `formVc` is 'private'. You can make it 'protected' in `MyCardViewController` to get around this.
+
+> **Note**: Now you should get an error that your form is not rendering the expected fields. It's time to implement the fields in your form.
+
+</details>
+
+
 ## View Controller Plugins
 
 You can globally enhance View Controller functionality by using View Controller Plugins. Here are some plugins that are already available: