feat(breaking): upgrade to Jest 25 (#110)

* fix(package): update pretty-format to version 25.1.0

* fix(package): update jest-snapshot to version 25.1.0

* fix(package): update jest-diff to version 25.1.0

* chore(package): update lockfile yarn.lock

* update imports and undefined testName

Co-authored-by: Michał Pierzchała <thymikee@gmail.com>

Author: greenkeeper[bot]

__tests__/__snapshots__/snapshotDiff.test.js.snap

@@ -15,15 +15,15 @@ exports[`can colorize diff 1`] = `
       very
       long
       script
-[2m  [22m"
+"
 `;
 
 exports[`can expand diff 1`] = `
 "Snapshot Diff:
 - First value
 + Second value
 
-  
+
       some
       some
       some
@@ -36,7 +36,7 @@ exports[`can expand diff 1`] = `
       very
       long
       script
-  "
+"
 `;
 
 exports[`can use contextLines on diff 1`] = `
@@ -92,7 +92,7 @@ exports[`can use stablePatchmarks on diff 1`] = `
   @very
   @long
   @script
-  "
+"
 `;
 
 exports[`collapses diffs and strips ansi by default 1`] = `
@@ -110,7 +110,7 @@ exports[`collapses diffs and strips ansi by default 1`] = `
       very
       long
       script
-  "
+"
 `;
 
 exports[`detects React components 1`] = `
@@ -155,7 +155,7 @@ exports[`diffs short strings 1`] = `
 - First value
 + Second value
 
-  
+
 -   abcx
 +   abcy
     "

__tests__/__snapshots__/toMatchDiffSnapshot.test.js.snap

@@ -15,7 +15,7 @@ exports[`proxies "colors" option(s) 1`] = `
       very
       long
       script
-[2m  [22m"
+"
 `;
 
 exports[`proxies "contextLines" option(s) 1`] = `
@@ -32,7 +32,7 @@ exports[`proxies "expand" option(s) 1`] = `
 - First value
 + Second value
 
-  
+
       some
       some
       some
@@ -45,7 +45,7 @@ exports[`proxies "expand" option(s) 1`] = `
       very
       long
       script
-  "
+"
 `;
 
 exports[`works with custom name: slim 1`] = `
@@ -63,7 +63,7 @@ exports[`works with custom name: slim 1`] = `
       very
       long
       script
-  "
+"
 `;
 
 exports[`works with default options 1`] = `
@@ -81,5 +81,5 @@ exports[`works with default options 1`] = `
       very
       long
       script
-  "
+"
 `;

package.json

@@ -19,9 +19,9 @@
     "jest": ">=16"
   },
   "dependencies": {
-    "jest-diff": "^24.0.0",
-    "jest-snapshot": "^24.0.0",
-    "pretty-format": "^24.0.0",
+    "jest-diff": "^25.1.0",
+    "jest-snapshot": "^25.1.0",
+    "pretty-format": "^25.1.0",
     "strip-ansi": "^6.0.0"
   },
   "devDependencies": {

src/index.js

@@ -2,7 +2,7 @@
 
 'use strict';
 
-const diff = require('jest-diff');
+const diff = require('jest-diff').default;
 const snapshot = require('jest-snapshot');
 const reactSerializer = require('./react-serializer');
 
@@ -84,7 +84,7 @@ function toMatchDiffSnapshot(
 ) {
   const difference = snapshotDiff(valueA, valueB, options);
 
-  return snapshot.toMatchSnapshot.call(this, difference, testName);
+  return snapshot.toMatchSnapshot.call(this, difference, testName || '');
 }
 
 function getSnapshotDiffSerializer() {