Update toEqual failure message (jestjs#7325)

* Update toEqual failure message

* Update changelog

* Update failing snapshots

* Show one line reports

* Update failure message when diffString is null

* Update failing snapshot

* Update failure message for jest-diff edge cases

CHANGELOG.md

@@ -90,6 +90,7 @@
 - `[jest-config]` Use strings instead of `RegExp` instances in normalized configuration ([#7251](https://github.com/facebook/jest/pull/7251))
 - `[jest-circus]` Make sure to display real duration even if time is mocked ([#7264](https://github.com/facebook/jest/pull/7264))
 - `[expect]` Improves the failing message for `toStrictEqual` matcher. ([#7224](https://github.com/facebook/jest/pull/7224))
+- `[expect]` Improves the failing message for `toEqual` matcher. ([#7325](https://github.com/facebook/jest/pull/7325))
 - `[jest-resolve]` Fix not being able to resolve path to mapped file with custom platform ([#7312](https://github.com/facebook/jest/pull/7312))
 - `[jest-message-util]` Improve parsing of error messages for unusually formatted stack traces ([#7319](https://github.com/facebook/jest/pull/7319))
 - `[jest-runtime]` Ensure error message text is not lost on errors with code frames ([#7319](https://github.com/facebook/jest/pull/7319))

e2e/__tests__/__snapshots__/failures.test.js.snap

@@ -272,10 +272,8 @@ exports[`works with assertions in separate files 1`] = `
 
     expect(received).toEqual(expected)
 
-    Expected value to equal:
-      2
-    Received:
-      1
+    Expected: 2
+    Received: 1
 
       10 | 
       11 | module.exports = (one: any, two: any) => {
@@ -302,11 +300,6 @@ exports[`works with async failures 1`] = `
 
     expect(received).toEqual(expected)
 
-    Expected value to equal:
-      {\\"baz\\": \\"bar\\"}
-    Received:
-      {\\"foo\\": \\"bar\\"}
-
     Difference:
 
     - Expected
@@ -331,11 +324,6 @@ exports[`works with async failures 1`] = `
 
     expect(received).toEqual(expected)
 
-    Expected value to equal:
-      {\\"baz\\": \\"bar\\"}
-    Received:
-      {\\"foo\\": \\"bar\\"}
-
     Difference:
 
     - Expected

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

@@ -3,11 +3,6 @@
 exports[`defines asymmetric unary matchers 1`] = `
 "<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
 
-Expected value to equal:
-  <green>{\\"value\\": toBeDivisibleBy<2>}</>
-Received:
-  <red>{\\"value\\": 3}</>
-
 Difference:
 
 <green>- Expected</>
@@ -22,11 +17,6 @@ Difference:
 exports[`defines asymmetric unary matchers that can be prefixed by not 1`] = `
 "<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
 
-Expected value to equal:
-  <green>{\\"value\\": not.toBeDivisibleBy<2>}</>
-Received:
-  <red>{\\"value\\": 2}</>
-
 Difference:
 
 <green>- Expected</>
@@ -41,11 +31,6 @@ Difference:
 exports[`defines asymmetric variadic matchers 1`] = `
 "<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
 
-Expected value to equal:
-  <green>{\\"value\\": toBeWithinRange<4, 11>}</>
-Received:
-  <red>{\\"value\\": 3}</>
-
 Difference:
 
 <green>- Expected</>
@@ -60,11 +45,6 @@ Difference:
 exports[`defines asymmetric variadic matchers that can be prefixed by not 1`] = `
 "<dim>expect(</><red>received</><dim>).toEqual(</><green>expected</><dim>)</>
 
-Expected value to equal:
-  <green>{\\"value\\": not.toBeWithinRange<1, 3>}</>
-Received:
-  <red>{\\"value\\": 2}</>
-
 Difference:
 
 <green>- Expected</>