Adding a negative test case to test a dot in the beginning of the path

Author: iifawzi

packages/expect/src/__tests__/__snapshots__/matchers.test.js.snap

@@ -3334,6 +3334,15 @@ Expected value: <g>1</>
 Received value: <r>{"c": {"d": 1}}</>
 `;
 
+exports[`.toHaveProperty() {pass: false} expect({"a": {"b": {"c": {}}}}).toHaveProperty('.a.b.c') 1`] = `
+<d>expect(</><r>received</><d>).</>toHaveProperty<d>(</><g>path</><d>)</>
+
+Expected path: <g>".a.b.c"</>
+Received path: <r>[]</>
+
+Received value: <r>{"a": {"b": {"c": {}}}}</>
+`;
+
 exports[`.toHaveProperty() {pass: false} expect({"a": {"b": {"c": {}}}}).toHaveProperty('a.b.c.d') 1`] = `
 <d>expect(</><r>received</><d>).</>toHaveProperty<d>(</><g>path</><d>)</>
 

packages/expect/src/__tests__/matchers.test.js

@@ -1958,6 +1958,7 @@ describe('.toHaveProperty()', () => {
 
   [
     [{a: {b: {c: {}}}}, 'a.b.c.d'],
+    [{a: {b: {c: {}}}}, '.a.b.c'],
     [{a: 1}, 'a.b.c.d'],
     [{}, 'a'],
     [1, 'a.b.c'],

packages/expect/src/utils.ts

@@ -377,7 +377,7 @@ export const pathAsArray = (propertyPath: string): Array<any> => {
   const pattern = RegExp('[^.[\\]]+|(?=(?:\\.)(?:\\.|$))', 'g');
   const properties: Array<string> = [];
 
-  // because the regex won't match the first dot, if present.
+  // Because the regex won't match a dot in the beginning of the path, if present.
   if (propertyPath[0] === '.') {
     properties.push('');
   }