Add config migrations (#693)

Co-authored-by: Danielv123 <danielv@danielv.no>

test/lib/config/classes.js

@@ -7,6 +7,14 @@ const CA = lib.ConfigAccess;
 describe("lib/config/classes", function() {
 	describe("Config", function() {
 		class TestConfig extends lib.Config {
+			static migrations(config) {
+				if (config.hasOwnProperty("test.migration")) {
+					config["alpha.foo"] = config["test.migration"];
+					delete config["test.migration"];
+				}
+				return config;
+			}
+
 			static fieldDefinitions = {
 				"alpha.foo": { type: "string", optional: true },
 				"beta.bar": { type: "object", initialValue: {} },
@@ -60,6 +68,13 @@ describe("lib/config/classes", function() {
 				assert.equal(testInstance.fields["test.enum"], "b");
 				assert.equal(testInstance.fields["test.priv"], undefined);
 			});
+			it("should apply migrations", function() {
+				const config = new TestConfig("local", {
+					"test.migration": "foo",
+				});
+				assert.equal(config.get("alpha.foo"), "foo");
+				assert.equal(config.fields["test.migration"], undefined);
+			});
 		});
 
 		describe(".toJSON()", function() {

test/mock.js

@@ -160,7 +160,7 @@ class MockController {
 		this.app.locals.controller = this;
 		this.app.locals.streams = new Map();
 		this.mockConfigEntries = new Map([
-			["controller.external_address", "test"],
+			["controller.public_url", "test"],
 			["controller.auth_secret", "TestSecretDoNotUse"],
 			["controller.proxy_stream_timeout", 1],
 		]);