tests: update nodes tests

tests/cypress/component/1-store/nodes/findNode.cy.ts

@@ -20,10 +20,27 @@ describe('Store Action: `findNode`', () => {
 
   it('finds node in store', () => {
     const storedNode = store.findNode(nodes[randomIndex].id)
-    expect(storedNode?.id).to.equal(nodes[randomIndex].id)
+
+    if (!storedNode) {
+      throw new Error('Node not found in store')
+    }
+
+    expect(storedNode.id).to.equal(nodes[randomIndex].id)
   })
 
   it('does not find node in store when passed invalid id', () => {
-    expect(store.findNode('-123')).to.equal(undefined)
+    expect(store.findNode('some-invalid-id')).to.equal(undefined)
+  })
+
+  it('does not find node in store when passed undefined', () => {
+    expect(store.findNode(undefined)).to.equal(undefined)
+  })
+
+  it('does not find node in store when passed empty string', () => {
+    expect(store.findNode('')).to.equal(undefined)
+  })
+
+  it('does not find node in store when passed number', () => {
+    expect(store.findNode(123 as any)).to.equal(undefined)
   })
 })