fix: only updatePassedSnapshot if updateSnapshot is also true (#327)

* chore(deps): bump qs from 6.5.2 to 6.5.3 (#320)

* chore(deps): make jest optional peerDependency (#322)

* chore(deps): bump http-cache-semantics from 4.1.0 to 4.1.1 (#324)

Bumps [http-cache-semantics](https://github.com/kornelski/http-cache-semantics) from 4.1.0 to 4.1.1.
- [Release notes](https://github.com/kornelski/http-cache-semantics/releases)
- [Commits](kornelski/http-cache-semantics@v4.1.0...v4.1.1)

---
updated-dependencies:
- dependency-name: http-cache-semantics
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* fix: updatePassedSnapshot to only update passed snapshots when jest --updatesnapshot flag is present

* fix: fixed indentations

* fix: added unit test case

* removed package.json file

* Revert "removed package.json file"

This reverts commit 6cf2343.

---------

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

__tests__/diff-snapshot.spec.js

@@ -693,6 +693,22 @@ describe('diff-snapshot', () => {
       expect(diffResult).toHaveProperty('diffOutputPath', path.join(mockSnapshotsDir, '__diff_output__', `${mockSnapshotIdentifier}-diff.png`));
     });
 
+    describe('diffImageToSnapshot', () => {
+      it('should fail if snapshot already exists', () => {
+        const { diffImageToSnapshot } = setupTest({ snapshotExists: true });
+        const options = {
+          receivedImageBuffer: mockFailImageBuffer,
+          snapshotIdentifier: mockSnapshotIdentifier,
+          snapshotsDir: mockSnapshotsDir,
+          updateSnapshot: false,
+        };
+
+        expect(() => {
+          diffImageToSnapshot(options);
+        }).toThrow();
+      });
+    });
+
     it('should throw an error if an unknown threshold type is supplied', () => {
       const diffImageToSnapshot = setupTest({ snapshotExists: true });
 

src/diff-snapshot.js

@@ -147,9 +147,8 @@ const alignImagesToSameSize = (firstImage, secondImage) => {
 
 const isFailure = ({ pass, updateSnapshot }) => !pass && !updateSnapshot;
 
-const shouldUpdate = ({ pass, updateSnapshot, updatePassedSnapshot }) => (
-  (!pass && updateSnapshot) || (pass && updatePassedSnapshot)
-);
+const shouldUpdate = ({ pass, updateSnapshot, updatePassedSnapshot }) =>
+  updateSnapshot && (!pass || (pass && updatePassedSnapshot));
 
 const shouldFail = ({
   totalPixels,