Dependencies test project must be built before test run

These tests rely on the workspace-state.json being present in the .build
folder, however on fresh checkouts this file has not been created before
the tests run.

Author: plemarquand

assets/test/dependencies/Packages/swift-markdown

@@ -0,0 +1 @@
+/Users/plemarquand/work/vscode-swift/assets/test/Swift-Markdown

test/integration-tests/commands/dependency.test.ts

@@ -61,6 +61,13 @@ suite("Dependency Commmands Test Suite", function () {
             await waitForNoRunningTasks();
             folderContext = await folderContextPromise("dependencies");
             await workspaceContext.focusFolder(folderContext);
+
+            tasks = (await getBuildAllTask(folderContext)) as SwiftTask;
+            const { exitCode, output } = await executeTaskAndWaitForResult(tasks);
+            expect(exitCode).to.not.equal(0);
+            expect(output).to.include("PackageLib");
+            expect(output).to.include("required");
+
             treeProvider = new PackageDependenciesProvider(workspaceContext);
 
             const items = await treeProvider.getChildren();