Resolver/test panel presence (#73889)

* Test for panel presence

x-pack/plugins/security_solution/public/resolver/test_utilities/simulator/index.tsx

@@ -251,6 +251,20 @@ export class Simulator {
     return this.findInDOM('[data-test-subj="resolver:graph"]');
   }
 
+  /**
+   * The outer panel container.
+   */
+  public panelElement(): ReactWrapper {
+    return this.findInDOM('[data-test-subj="resolver:panel"]');
+  }
+
+  /**
+   * The panel content element (which may include tables, lists, other data depending on the view).
+   */
+  public panelContentElement(): ReactWrapper {
+    return this.findInDOM('[data-test-subj^="resolver:panel:"]');
+  }
+
   /**
    * Like `this.wrapper.find` but only returns DOM nodes.
    */

x-pack/plugins/security_solution/public/resolver/view/clickthrough.test.tsx

@@ -63,6 +63,16 @@ describe('Resolver, when analyzing a tree that has 1 ancestor and 2 children', (
       expect(simulator.processNodeElements().length).toBe(3);
     });
 
+    it(`should have the default "process list" panel present`, async () => {
+      expect(simulator.panelElement().length).toBe(1);
+      expect(simulator.panelContentElement().length).toBe(1);
+      const testSubjectName = simulator
+        .panelContentElement()
+        .getDOMNode()
+        .getAttribute('data-test-subj');
+      expect(testSubjectName).toMatch(/process-list/g);
+    });
+
     describe("when the second child node's first button has been clicked", () => {
       beforeEach(() => {
         // Click the first button under the second child element.

x-pack/plugins/security_solution/public/resolver/view/panel.tsx

@@ -220,7 +220,7 @@ PanelContent.displayName = 'PanelContent';
 
 export const Panel = memo(function Event({ className }: { className?: string }) {
   return (
-    <EuiPanel className={className}>
+    <EuiPanel className={className} data-test-subj="resolver:panel">
       <PanelContent />
     </EuiPanel>
   );

x-pack/plugins/security_solution/public/resolver/view/panels/panel_content_process_list.tsx

@@ -187,7 +187,12 @@ export const ProcessListWithCounts = memo(function ProcessListWithCounts({
       <StyledBreadcrumbs breadcrumbs={crumbs} />
       {showWarning && <StyledLimitWarning numberDisplayed={numberOfProcesses} />}
       <EuiSpacer size="l" />
-      <EuiInMemoryTable<ProcessTableView> items={processTableView} columns={columns} sorting />
+      <EuiInMemoryTable<ProcessTableView>
+        data-test-subj="resolver:panel:process-list"
+        items={processTableView}
+        columns={columns}
+        sorting
+      />
     </>
   );
 });