Add tests for installWrangler

[courtney-sims]

Baby step refactor to get more tests into this repo:

• isolates index functions from side effects
• creates type for config
• uses config and package manager types for parameters to index functions so we can pass in some test data
• adds some tests for the InstallWrangler method

Also pins the node version to avoid compatibility issues with the newly released version 23

Tested by running this version on a demo site:

[jrf0110]

Now that we're defining a type for config, we should use it when instantiating config in index.ts here https://github.com/cloudflare/wrangler-action/pull/322/files#diff-a2a171449d862fe29692ce031981047d7ab755ae7f84c707aef80701b3ea0c80L40

/**
 * A configuration object that contains all the inputs & immutable state for the action.
 */
const config: WranglerActionConfig = {
	WRANGLER_VERSION: getInput("wranglerVersion") || DEFAULT_WRANGLER_VERSION,
	didUserProvideWranglerVersion: Boolean(getInput("wranglerVersion")),
	secrets: getMultilineInput("secrets"),
	workingDirectory: checkWorkingDirectory(getInput("workingDirectory")),
	CLOUDFLARE_API_TOKEN: getInput("apiToken"),
	CLOUDFLARE_ACCOUNT_ID: getInput("accountId"),
	ENVIRONMENT: getInput("environment"),
	VARS: getMultilineInput("vars"),
	COMMANDS: getMultilineInput("command"),
	QUIET_MODE: getBooleanInput("quiet"),
	PACKAGE_MANAGER: getInput("packageManager"),
	WRANGLER_OUTPUT_DIR: `${join(tmpdir(), "wranglerArtifacts")}`,
} ;

Or you could put the runtime validation there:

const config = WranglerActionConfig.parse({
	WRANGLER_VERSION: getInput("wranglerVersion") || DEFAULT_WRANGLER_VERSION,
	didUserProvideWranglerVersion: Boolean(getInput("wranglerVersion")),
	secrets: getMultilineInput("secrets"),
	workingDirectory: checkWorkingDirectory(getInput("workingDirectory")),
	CLOUDFLARE_API_TOKEN: getInput("apiToken"),
	CLOUDFLARE_ACCOUNT_ID: getInput("accountId"),
	ENVIRONMENT: getInput("environment"),
	VARS: getMultilineInput("vars"),
	COMMANDS: getMultilineInput("command"),
	QUIET_MODE: getBooleanInput("quiet"),
	PACKAGE_MANAGER: getInput("packageManager"),
	WRANGLER_OUTPUT_DIR: `${join(tmpdir(), "wranglerArtifacts")}`,
}  satisfies WranglerActionConfig);

[courtney-sims]

Good point! Thanks!

[Maximo-Guk]

Maybe we could just pin it to 22?