chore: FileAppendHandler unit test coverage

[kimbor]

Description:
Improve unit test coverage for FileAppendHandler class

Related issue(s):

Fixes #13188

[github-actions]

Node: HAPI Test (Restart) Results

2 tests   2 ✅  7m 53s ⏱️
2 suites  0 💤
2 files    0 ❌

Results for commit 1b27ec1.

[github-actions]

Node: HAPI Test (Node Death Reconnect) Results

2 tests   2 ✅  9m 8s ⏱️
2 suites  0 💤
2 files    0 ❌

Results for commit 1b27ec1.

[github-actions]

Node: HAPI Test (Token) Results

235 tests   233 ✅  19m 14s ⏱️
 17 suites    2 💤
 17 files      0 ❌

Results for commit 1b27ec1.

[github-actions]

Node: HAPI Test (Crypto) Results

335 tests   335 ✅  35m 47s ⏱️
 25 suites    0 💤
 25 files      0 ❌

Results for commit 1b27ec1.

[github-actions]

Node: HAPI Test (Misc) Results

459 tests   449 ✅  39m 9s ⏱️
 77 suites   10 💤
 77 files      0 ❌

Results for commit 1b27ec1.

[github-actions]

Node: Unit Test Results

  2 286 files  ±0    2 286 suites  ±0   2h 39m 47s ⏱️ - 38m 45s
118 847 tests +3  118 780 ✅ +3  67 💤 ±0  0 ❌ ±0 
127 335 runs  +3  127 268 ✅ +3  67 💤 ±0  0 ❌ ±0 

Results for commit 1b27ec1. ± Comparison against base commit 1722fef.

This pull request removes 4037 and adds 3804 tests. Note that renamed tests count towards both.

  
             IssuerDN: CN=s-aaaa
            SubjectDN: CN=s-aaaa
           Final Date: Fri Jan 01 00:00:00 UTC 2100
           Public Key: RSA Public Key [2e:28:bc:1e:d3:83:25:92:8e:cb:98:b1:b6:84:06:9c:d5:d8:14:d5],[56:66:d1:a4]
           Start Date: Sat Jan 01 00:00:00 UTC 2000
         SerialNumber: 12482092706667292405
        modulus: c1a0ff5d2372b53d12d12bb87dd03f5…
   Address[id=0,nickname=Austin,selfName=aaaa,weight=1000,hostnameInternal=127.0.0.1,portInternalIpv4=11282,hostnameExternal=187.245.70.189,portExternalIpv4=58655,sigPublicKey=<null>,agreePublicKey=<null>,sigCert=com.swirlds.platform.crypto.SerializableX509Certificate@5357bed9,agreeCert=com.swirlds.platform.crypto.SerializableX509Certificate@3fdb9eb9,memo=g75T9ArskB],
…

com.hedera.node.app.grpc.impl.netty.GrpcServiceBuilderTest ‑ [4] 

com.hedera.node.app.grpc.impl.netty.GrpcServiceBuilderTest ‑ [6] 

com.hedera.node.app.grpc.impl.netty.GrpcServiceBuilderTest ‑ [7]   
  
com.hedera.node.app.service.file.impl.test.handlers.FileAppendHandlerTest ‑ Fails handle if keys doesn't exist on file to be appended
com.hedera.node.app.service.file.impl.test.handlers.FileAppendHandlerTest ‑ Pre handle works as expected
com.hedera.node.app.service.file.impl.test.handlers.FileAppendHandlerTest ‑ Pre handle works as expected immutable
com.hedera.node.app.service.file.impl.test.handlers.FileAppendHandlerTest ‑ appliesNewContent()
com.hedera.node.app.service.file.impl.test.handlers.FileAppendHandlerTest ‑ appliesUpgradeFileNewContent()
com.hedera.node.app.service.file.impl.test.handlers.FileAppendHandlerTest ‑ calculateFeesHappyPath()
com.hedera.node.app.service.file.impl.test.handlers.FileAppendHandlerTest ‑ handleRejectsMissingFile()
…

[github-actions]

Node: HAPI Test (Time Consuming) Results

21 tests   21 ✅  54m 2s ⏱️
 3 suites   0 💤
 3 files     0 ❌

Results for commit 1b27ec1.

[github-actions]

Node: HAPI Test (Smart Contract) Results

592 tests   591 ✅  1h 7m 21s ⏱️
 63 suites    0 💤
 63 files      1 ❌

For more details on these failures, see this check.

Results for commit 1b27ec1.

♻️ This comment has been updated with latest results.