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test(jest): prepare unit tests

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`@@ -1,5 +1,42 @@`
`1`	`1`	`import * as lambda from '@aws-cdk/aws-lambda';`
	`2`	`+import * as cdk from '@aws-cdk/core';`
	`3`	`+`
	`4`	`+import { nodeMajorVersion } from './utils';`
	`5`	`+`
	`6`	`+export interface NodejsFunctionProps extends lambda.FunctionOptions {`
	`7`	`+ /**`
	`8`	`+ * The name of the exported handler in the entry file.`
	`9`	`+ *`
	`10`	`+ * @default "handler"`
	`11`	`+ */`
	`12`	`+ readonly handler?: string;`
	`13`	`+ /**`
	`14`	`+ * The runtime environment. Only runtimes of the Node.js family are`
	`15`	`+ * supported.`
	`16`	`+ *`
	`17`	+ * @default - `NODEJS_12_X` if `process.versions.node` >= '12.0.0',
	`18`	+ * `NODEJS_10_X` otherwise.
	`19`	`+ */`
	`20`	`+ readonly runtime?: lambda.Runtime;`
	`21`	`+}`
`2`	`22`
`3`	`23`	`export class NodejsFunction extends lambda.Function {`
	`24`	`+ constructor(scope: cdk.Construct, id: string, props: NodejsFunctionProps = {}) {`
	`25`	`+ if (props.runtime && props.runtime.family !== lambda.RuntimeFamily.NODEJS) {`
	`26`	+ throw new Error('Only `NODEJS` runtimes are supported.');
	`27`	`+ }`
	`28`	`+`
	`29`	`+ const handler = props.handler ?? 'handler';`
	`30`	`+ const defaultRunTime = nodeMajorVersion() >= 12`
	`31`	`+ ? lambda.Runtime.NODEJS_12_X`
	`32`	`+ : lambda.Runtime.NODEJS_10_X;`
	`33`	`+ const runtime = props.runtime ?? defaultRunTime;`
`4`	`34`
	`35`	`+ super(scope, id, {`
	`36`	`+ ...props,`
	`37`	`+ runtime,`
	`38`	`+ code: lambda.Code.fromInline('TODO'),`
	`39`	+ handler: `index.${handler}`,
	`40`	`+ });`
	`41`	`+ }`
`5`	`42`	`}`

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	`1`	`+/**`
	`2`	`+ * Returns the major version of node installation`
	`3`	`+ */`
	`4`	`+export function nodeMajorVersion(): number {`
	`5`	`+ return parseInt(process.versions.node.split('.')[0], 10);`
	`6`	`+}`

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	`1`	`+import '@aws-cdk/assert/jest';`
	`2`	`+import { Stack } from '@aws-cdk/core';`
	`3`	`+import { NodejsFunction } from '../src';`
	`4`	`+`
	`5`	`+describe('NodejsFunction tests', () => {`
	`6`	`+ it('Should not class constructor be thrown', async () => {`
	`7`	`+ const stack = new Stack();`
	`8`	`+ const factory = () => new NodejsFunction(stack, 'lambda-function', {});`
	`9`	`+ expect(factory).not.toThrow();`
	`10`	`+ expect(stack).toHaveResource('AWS::Lambda::Function', {`
	`11`	`+ Handler: 'index.handler',`
	`12`	`+ });`
	`13`	`+ });`
	`14`	`+});`

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