more tests, document config usage

README.md

@@ -47,6 +47,23 @@ npm install @oceanprotocol/lib
 
 ## 🏄 Quick Start
 
+```js
+import { Ocean, ConfigHelper } from '@oceanprotocol/lib'
+
+const defaultConfig = new ConfigHelper().getConfig('rinkeby', 'YOUR_INFURA_PROJECT_ID')
+
+const config = {
+  ...defaultConfig,
+  metadataStoreUri: 'https://your-metadata-store.com',
+  providerUri: 'https://your-provider.com'
+}
+
+async function init() {
+  const ocean = await Ocean.getInstance(config)
+  return ocean
+}
+```
+
 ### Simple Flow
 
 This stripped-down flow shows the essence of Ocean. Just downloading, no metadata.

src/utils/ConfigHelper.ts

@@ -1,4 +1,5 @@
 import Config from '../models/Config'
+import { Logger } from '../lib'
 
 export declare type ConfigHelperNetworkName =
   | 'mainnet'
@@ -56,10 +57,15 @@ export class ConfigHelper {
     const filterBy = typeof network === 'string' ? 'network' : 'chainId'
     const config = configs.find((c) => c[filterBy] === network)
 
+    if (!config) {
+      Logger.error(`No config found for given network '${network}'`)
+      return null
+    }
+
     const nodeUri = infuraProjectId
       ? `${config.nodeUri}/${infuraProjectId}`
       : config.nodeUri
 
-    return config ? { ...config, nodeUri } : null
+    return { ...config, nodeUri }
   }
 }

test/unit/utils/ConfigHelper.test.ts

@@ -14,4 +14,16 @@ describe('ConfigHelper', () => {
     const config = new ConfigHelper().getConfig(network, infuraId)
     assert(config.nodeUri.includes(infuraId))
   })
+
+  it('should get config based on chain ID', () => {
+    const network = 4
+    const config = new ConfigHelper().getConfig(network)
+    assert(config.chainId === network)
+  })
+
+  it('should return nothing with unknown network', () => {
+    const network = 'blabla'
+    const config = new ConfigHelper().getConfig(network)
+    assert(config === null)
+  })
 })