Add test for empty result view bug

extensions/ql-vscode/src/view/results/__tests__/results.spec.tsx

@@ -1,5 +1,5 @@
 import * as React from "react";
-import { render as reactRender, screen } from "@testing-library/react";
+import { act, render as reactRender, screen } from "@testing-library/react";
 import { ResultsApp } from "../results";
 import {
   Interpretation,
@@ -20,18 +20,20 @@ const exampleSarif = fs.readJSONSync(
 describe(ResultsApp.name, () => {
   const render = () => reactRender(<ResultsApp />);
   const postMessage = async (msg: IntoResultsViewMsg) => {
-    // window.postMessage doesn't set the origin correctly, see
-    // https://github.com/jsdom/jsdom/issues/2745
-    window.dispatchEvent(
-      new MessageEvent("message", {
-        source: window,
-        origin: window.location.origin,
-        data: msg,
-      }),
-    );
+    await act(async () => {
+      // window.postMessage doesn't set the origin correctly, see
+      // https://github.com/jsdom/jsdom/issues/2745
+      window.dispatchEvent(
+        new MessageEvent("message", {
+          source: window,
+          origin: window.location.origin,
+          data: msg,
+        }),
+      );
 
-    // The event is dispatched asynchronously, so we need to wait for it to be handled.
-    await new Promise((resolve) => setTimeout(resolve, 0));
+      // The event is dispatched asynchronously, so we need to wait for it to be handled.
+      await new Promise((resolve) => setTimeout(resolve, 0));
+    });
   };
 
   it("renders results", async () => {
@@ -95,6 +97,7 @@ describe(ResultsApp.name, () => {
         },
       },
     };
+
     await postMessage(message);
 
     expect(
@@ -117,4 +120,84 @@ describe(ResultsApp.name, () => {
       screen.getByText("'x' is assigned a value but never used."),
     ).toBeInTheDocument();
   });
+
+  it("renders results when switching between queries with different result set names", async () => {
+    render();
+
+    await postMessage({
+      t: "setState",
+      interpretation: undefined,
+      origResultsPaths: {
+        resultsPath: "/a/b/c/results.bqrs",
+        interpretedResultsPath: "/a/b/c/interpretedResults.sarif",
+      },
+      resultsPath: "/a/b/c/results.bqrs",
+      parsedResultSets: {
+        pageNumber: 0,
+        pageSize: 200,
+        numPages: 1,
+        numInterpretedPages: 0,
+        resultSet: {
+          schema: {
+            name: "#select",
+            rows: 1,
+            columns: [{ kind: "s" }],
+            pagination: { "step-size": 200, offsets: [13] },
+          },
+          rows: [["foobar1"]],
+          t: "RawResultSet",
+        },
+        resultSetNames: ["#select"],
+      },
+      sortedResultsMap: {},
+      database: {
+        name: "test-db",
+        databaseUri: "test-db-uri",
+      },
+      shouldKeepOldResultsWhileRendering: false,
+      metadata: {},
+      queryName: "empty.ql",
+      queryPath: "/a/b/c/empty.ql",
+    });
+
+    expect(screen.getByText("foobar1")).toBeInTheDocument();
+
+    await postMessage({
+      t: "setState",
+      interpretation: undefined,
+      origResultsPaths: {
+        resultsPath: "/a/b/c/results.bqrs",
+        interpretedResultsPath: "/a/b/c/interpretedResults.sarif",
+      },
+      resultsPath: "/a/b/c/results.bqrs",
+      parsedResultSets: {
+        pageNumber: 0,
+        pageSize: 200,
+        numPages: 1,
+        numInterpretedPages: 0,
+        resultSet: {
+          schema: {
+            name: "#Quick_evaluation_of_expression",
+            rows: 1,
+            columns: [{ name: "#expr_result", kind: "s" }],
+            pagination: { "step-size": 200, offsets: [49] },
+          },
+          rows: [["foobar2"]],
+          t: "RawResultSet",
+        },
+        resultSetNames: ["#Quick_evaluation_of_expression"],
+      },
+      sortedResultsMap: {},
+      database: {
+        name: "test-db",
+        databaseUri: "test-db-uri",
+      },
+      shouldKeepOldResultsWhileRendering: false,
+      metadata: {},
+      queryName: "Quick evaluation of empty.ql:1",
+      queryPath: "/a/b/c/empty.ql",
+    });
+
+    expect(screen.getByText("foobar2")).toBeInTheDocument();
+  });
 });