tests: update edges tests

tests/cypress/component/1-store/edges/findEdge.cy.ts

@@ -18,12 +18,29 @@ describe('Store Action: `findEdge`', () => {
     randomIndex = Math.floor(Math.random() * edges.length)
   })
 
-  it('finds edge in store', () => {
+  it('finds edge in store when passed a valid (string) and existing id', () => {
     const storedEdge = store.findEdge(edges[randomIndex].id)
-    expect(storedEdge?.id).to.equal(edges[randomIndex].id)
+
+    if (!storedEdge) {
+      throw new Error('Edge not found in store')
+    }
+
+    expect(storedEdge.id).to.equal(edges[randomIndex].id)
   })
 
   it('does not find edge in store when passed invalid id', () => {
-    expect(store.findEdge('-123')).to.equal(undefined)
+    expect(store.findEdge('some-invalid-id')).to.equal(undefined)
+  })
+
+  it('does not find edge in store when passed undefined', () => {
+    expect(store.findEdge(undefined)).to.equal(undefined)
+  })
+
+  it('does not find edge in store when passed empty string', () => {
+    expect(store.findEdge('')).to.equal(undefined)
+  })
+
+  it('does not find edge in store when passed number', () => {
+    expect(store.findEdge(123 as any)).to.equal(undefined)
   })
 })