Add basic tests

These tests are really checking if expectations meet reality.

Author: mondoreale

src/utils/chains.test.ts

@@ -0,0 +1,74 @@
+import { config } from '@streamr/config'
+import { defaultChainKey } from '../consts'
+import { parsedChainConfigExtension } from './chainConfigExtension'
+import {
+    getChainDisplayName,
+    getChainKey,
+    getMarketplaceChainConfigs,
+    isChainKey,
+} from './chains'
+
+describe('getChainKey', () => {
+    it('defaults to the default chain key', () => {
+        expect(getChainKey('whatever')).toEqual(defaultChainKey)
+
+        expect(getChainKey(0)).toEqual(defaultChainKey)
+    })
+
+    it('extracts chain key by slug', () => {
+        expect(getChainKey('amoy')).toEqual('polygonAmoy')
+    })
+
+    it('is case insensitive', () => {
+        expect(getChainKey('AMOY')).toEqual('polygonAmoy')
+
+        expect(getChainKey('POlyGON')).toEqual('polygon')
+
+        expect(getChainKey('polygonamoy')).toEqual('polygonAmoy')
+    })
+
+    it('resolves a number to a chain key', () => {
+        expect(getChainKey(137)).toEqual('polygon')
+
+        expect(getChainKey(100)).toEqual('gnosis')
+    })
+})
+
+describe('isChainKey', () => {
+    it('correctly identifies chain keys', () => {
+        expect(isChainKey('whatever')).toBe(false)
+
+        expect(isChainKey('polygon')).toBe(true)
+
+        expect(isChainKey('gnosis')).toBe(true)
+    })
+})
+
+describe('getChainDisplayName', () => {
+    it('used custom naming for chains that we provide it for', () => {
+        // Local config extension provides a custom value
+        expect(parsedChainConfigExtension['polygonAmoy']?.displayName).toEqual('Amoy')
+
+        // Config provides a diffrent value
+        expect(config.polygonAmoy.name).not.toEqual('Amoy')
+
+        // Ultimately local name counts
+        expect(getChainDisplayName('polygonAmoy')).toEqual('Amoy')
+    })
+})
+
+describe('getMarketplaceChainConfigs', () => {
+    it('gives a list of configs for given keys', () => {
+        const [config0, config1, config2] = getMarketplaceChainConfigs('polygon')
+
+        expect(config0.id).toEqual(config.gnosis.id)
+
+        expect(config1.id).toEqual(config.polygon.id)
+
+        expect(config2).toBeUndefined()
+    })
+
+    it('gives an empty list of configs if there are no marketplace chain keys provided', () => {
+        expect(getMarketplaceChainConfigs('ethereum').length).toEqual(0)
+    })
+})