fix toContain suggest to contain equal message

CHANGELOG.md

@@ -19,6 +19,7 @@
 - `[jest-jasmine2]` Use prettier through `require` instead of `localRequire`. Fixes `matchInlineSnapshot` where prettier dependencies like `path` and `fs` are mocked with `jest.mock`. ([#6776](https://github.com/facebook/jest/pull/6776))
 - `[docs]` Fix contributors link ([#6711](https://github.com/facebook/jest/pull/6711))
 - `[website]` Fix website versions page to link to correct language ([#6734](https://github.com/facebook/jest/pull/6734))
+- `[expect]` Update `toContain` suggestion to contain equal message ([#6792](https://github.com/facebook/jest/pull/6810))
 
 ## 23.4.1
 

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

@@ -1517,7 +1517,9 @@ exports[`.toContain(), .toContainEqual() '[{}, []]' does not contain '[]' 1`] =
 Expected array:
   <red>[{}, []]</>
 To contain value:
-  <green>[]</> <dim>Looks like you wanted to test for object/array equality with the stricter \`toContain\` matcher. You probably need to use \`toContainEqual\` instead.</>"
+  <green>[]</>
+
+<dim>Looks like you wanted to test for object/array equality with the stricter \`toContain\` matcher. You probably need to use \`toContainEqual\` instead.</>"
 `;
 
 exports[`.toContain(), .toContainEqual() '[{}, []]' does not contain '{}' 1`] = `
@@ -1526,7 +1528,9 @@ exports[`.toContain(), .toContainEqual() '[{}, []]' does not contain '{}' 1`] =
 Expected array:
   <red>[{}, []]</>
 To contain value:
-  <green>{}</> <dim>Looks like you wanted to test for object/array equality with the stricter \`toContain\` matcher. You probably need to use \`toContainEqual\` instead.</>"
+  <green>{}</>
+
+<dim>Looks like you wanted to test for object/array equality with the stricter \`toContain\` matcher. You probably need to use \`toContainEqual\` instead.</>"
 `;
 
 exports[`.toContain(), .toContainEqual() '[0, 1]' contains '1' 1`] = `

packages/expect/src/matchers.js

@@ -313,7 +313,7 @@ const matchers: MatchersObject = {
             `  ${printReceived(collection)}\n` +
             `To contain value:\n` +
             `  ${printExpected(value)}` +
-            (suggestToContainEqual ? ` ${SUGGEST_TO_CONTAIN_EQUAL}` : '')
+            (suggestToContainEqual ? `\n\n${SUGGEST_TO_CONTAIN_EQUAL}` : '')
           );
         };