fix(sap.fhir.model.r4.FHIRListBinding): Invalidate list bindings (#342)

* fix(sap.fhir.model.r4.FHIRListBinding): Invalidate list bindings

As per suggestion Server-side bindings (e.g. ODataListBinding) are expected to start with a "refresh" eventListBindings "initialize" + fire refresh-event (although not defined in the metadata)

* tests: fix test cases

* refactor: review comments

* tests: added tests

src/sap/fhir/model/r4/FHIRListBinding.js

@@ -65,7 +65,16 @@ sap.ui.define([
 			}
 			this.sId = FHIRUtils.uuidv4();
 			this._resetData();
+		},
+
+		initialize: function () {
+			// List doesn't get invalidated when context length is 0
+			// as per suggestion Server-side bindings (e.g. ODataListBinding) are expected to start with a "refresh" event
+			// overwrite the ListBindings "initialize" + fire refresh-event (although not defined in the metadata)
+			this.fireEvent("refresh", { reason: ChangeReason.Refresh });
+			return this;
 		}
+
 	});
 
 	/**

test/qunit/model/FHIRListBinding.integration.js

@@ -59,4 +59,16 @@ sap.ui.define(["../utils/TestUtilsIntegration", "../utils/TestUtils"], function
 	QUnit.test("check if valueset is loaded if mentioned in the structure definition field description of type 'codeableconcept'", function (assert) {
 		testValueSetLoadedCorrectly(assert, "/Coverage/a7854", "type", 1, 21);
 	});
+
+	QUnit.test("check if refresh event is triggered during list binding initialization", function (assert) {
+		createContextBinding("/Patient/a2519");
+		oListBinding = oModel.bindList("gender", oContextBinding.getBoundContext(), undefined, undefined, undefined);
+		var done = assert.async();
+		var fnChangeHandler = function (oEvent) {
+			assert.strictEqual(oEvent.mParameters.reason, "refresh");
+			done();
+		};
+		oListBinding.attachRefresh(fnChangeHandler);
+		oListBinding.initialize();
+	});
 });