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test: add test examples for prefixdb.go #22752

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@xujiangyu xujiangyu commented Dec 4, 2024

Description

Closes: #XXXX


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  • included the correct type prefix in the PR title, you can find examples of the prefixes below:
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  • reviewed "Files changed" and left comments if necessary
  • included the necessary unit and integration tests
  • added a changelog entry to CHANGELOG.md
  • updated the relevant documentation or specification, including comments for documenting Go code
  • confirmed all CI checks have passed

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  • confirmed the correct type prefix in the PR title
  • confirmed all author checklist items have been addressed
  • reviewed state machine logic, API design and naming, documentation is accurate, tests and test coverage

Summary by CodeRabbit

  • Tests
    • Introduced a new test suite to validate the functionality of the PrefixDB implementation, ensuring reliable operations for setting, getting, checking existence, and deleting keys.

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coderabbitai bot commented Dec 4, 2024

📝 Walkthrough

Walkthrough

A new test file named prefixdb_test.go has been added to the store/db package. This file contains a test suite for the PrefixDB implementation, utilizing the testing package, testify/require for assertions, and gomock for mocking dependencies. The test function TestPrefixDB validates the functionality of Set, Get, Has, and Delete operations, ensuring correct behavior and error handling for each method.

Changes

File Change Summary
store/db/prefixdb_test.go Introduced a new test file with a test function TestPrefixDB to validate PrefixDB operations.

Possibly related PRs

Suggested labels

C:Store

Suggested reviewers

  • kocubinski
  • cool-develope
  • sontrinh16
  • tac0turtle

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Actionable comments posted: 3

🧹 Outside diff range and nitpick comments (2)
store/db/prefixdb_test.go (2)

3-10: Reorder imports according to style guidelines

The imports should be grouped in the following order:

  1. Standard library
  2. Third-party packages
  3. First-party packages

Apply this diff to fix the import ordering:

import (
	"testing"

-	"github.com/stretchr/testify/require"
-	"cosmossdk.io/store/db"
-	"cosmossdk.io/store/mock"
-	"go.uber.org/mock/gomock"
+	"go.uber.org/mock/gomock"
+	"github.com/stretchr/testify/require"
+
+	"cosmossdk.io/store/db"
+	"cosmossdk.io/store/mock"
)
🧰 Tools
🪛 golangci-lint (1.62.2)

6-6: File is not gci-ed with --skip-generated -s standard -s default -s prefix(cosmossdk.io) -s prefix(github.com/cosmos/cosmos-sdk) --custom-order

(gci)


9-9: File is not gci-ed with --skip-generated -s standard -s default -s prefix(cosmossdk.io) -s prefix(github.com/cosmos/cosmos-sdk) --custom-order

(gci)


8-8: File is not gofumpt-ed with -extra

(gofumpt)


12-19: Consider using table-driven tests for better coverage

While the current test structure is functional, consider converting it to a table-driven test to:

  1. Test different prefix values
  2. Test edge cases (empty prefix, empty key)
  3. Test error scenarios from the underlying DB

Would you like me to provide an example of how to restructure this as a table-driven test?

📜 Review details

Configuration used: .coderabbit.yml
Review profile: CHILL

📥 Commits

Reviewing files that changed from the base of the PR and between 7fa2356 and 579aebc.

📒 Files selected for processing (1)
  • store/db/prefixdb_test.go (1 hunks)
🧰 Additional context used
📓 Path-based instructions (1)
store/db/prefixdb_test.go (2)

Pattern **/*.go: Review the Golang code for conformity with the Uber Golang style guide, highlighting any deviations.


Pattern **/*_test.go: "Assess the unit test code assessing sufficient code coverage for the changes associated in the pull request"

🪛 golangci-lint (1.62.2)
store/db/prefixdb_test.go

6-6: File is not gci-ed with --skip-generated -s standard -s default -s prefix(cosmossdk.io) -s prefix(github.com/cosmos/cosmos-sdk) --custom-order

(gci)


9-9: File is not gci-ed with --skip-generated -s standard -s default -s prefix(cosmossdk.io) -s prefix(github.com/cosmos/cosmos-sdk) --custom-order

(gci)


49-49: File is not gci-ed with --skip-generated -s standard -s default -s prefix(cosmossdk.io) -s prefix(github.com/cosmos/cosmos-sdk) --custom-order

(gci)


8-8: File is not gofumpt-ed with -extra

(gofumpt)

Comment on lines +20 to +32
key := []byte("key1")
value := []byte("value1")
mockDB.EXPECT().Set(gomock.Eq(append(prefix, key...)), gomock.Eq(value)).Return(nil)

err := pdb.Set(key, value)
require.NoError(t, err)

mockDB.EXPECT().Get(gomock.Eq(append(prefix, key...))).Return(value, nil)

returnedValue, err := pdb.Get(key)
require.NoError(t, err)
require.Equal(t, value, returnedValue)

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🛠️ Refactor suggestion

Add test cases for error scenarios and edge cases

The current test coverage for Set/Get operations could be enhanced by adding:

  1. Error scenarios from the underlying DB
  2. Edge cases with nil/empty values
  3. Concurrent access scenarios
  4. Large key/value pairs

Example test cases to add:

// Test error propagation
mockDB.EXPECT().Set(gomock.Any(), gomock.Any()).Return(errors.New("db error"))
err := pdb.Set(key, value)
require.Error(t, err)

// Test nil value
mockDB.EXPECT().Set(gomock.Any(), nil).Return(nil)
err = pdb.Set(key, nil)
require.NoError(t, err)

Comment on lines +33 to +49
mockDB.EXPECT().Has(gomock.Eq(append(prefix, key...))).Return(true, nil)

has, err := pdb.Has(key)
require.NoError(t, err)
require.True(t, has)

mockDB.EXPECT().Delete(gomock.Eq(append(prefix, key...))).Return(nil)

err = pdb.Delete(key)
require.NoError(t, err)

mockDB.EXPECT().Has(gomock.Eq(append(prefix, key...))).Return(false, nil)

has, err = pdb.Has(key)
require.NoError(t, err)
require.False(t, has)
}
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🛠️ Refactor suggestion

Enhance Has/Delete operations test coverage

The test coverage for Has/Delete operations should include:

  1. Error scenarios from the underlying DB
  2. Multiple key operations
  3. Delete of non-existent keys

Example test cases to add:

// Test Has error propagation
mockDB.EXPECT().Has(gomock.Any()).Return(false, errors.New("db error"))
_, err = pdb.Has(key)
require.Error(t, err)

// Test Delete non-existent key
mockDB.EXPECT().Delete(gomock.Any()).Return(nil)
err = pdb.Delete([]byte("non-existent-key"))
require.NoError(t, err)
🧰 Tools
🪛 golangci-lint (1.62.2)

49-49: File is not gci-ed with --skip-generated -s standard -s default -s prefix(cosmossdk.io) -s prefix(github.com/cosmos/cosmos-sdk) --custom-order

(gci)

Comment on lines +1 to +49
package db_test

import (
"testing"

"github.com/stretchr/testify/require"
"cosmossdk.io/store/db"
"cosmossdk.io/store/mock"
"go.uber.org/mock/gomock"
)

func TestPrefixDB(t *testing.T) {
mockCtrl := gomock.NewController(t)
defer mockCtrl.Finish()

mockDB := mock.NewMockKVStoreWithBatch(mockCtrl)
prefix := []byte("test:")
pdb := db.NewPrefixDB(mockDB, prefix)

key := []byte("key1")
value := []byte("value1")
mockDB.EXPECT().Set(gomock.Eq(append(prefix, key...)), gomock.Eq(value)).Return(nil)

err := pdb.Set(key, value)
require.NoError(t, err)

mockDB.EXPECT().Get(gomock.Eq(append(prefix, key...))).Return(value, nil)

returnedValue, err := pdb.Get(key)
require.NoError(t, err)
require.Equal(t, value, returnedValue)

mockDB.EXPECT().Has(gomock.Eq(append(prefix, key...))).Return(true, nil)

has, err := pdb.Has(key)
require.NoError(t, err)
require.True(t, has)

mockDB.EXPECT().Delete(gomock.Eq(append(prefix, key...))).Return(nil)

err = pdb.Delete(key)
require.NoError(t, err)

mockDB.EXPECT().Has(gomock.Eq(append(prefix, key...))).Return(false, nil)

has, err = pdb.Has(key)
require.NoError(t, err)
require.False(t, has)
}
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💡 Codebase verification

Test coverage needs significant improvement

The current test file is missing critical test coverage for required interface methods:

  1. Iterator and ReverseIterator methods are completely untested, despite being core requirements of the KVStore interface
  2. Batch operations through the KVStoreWithBatch interface are not covered
  3. No tests for edge cases like empty prefix, nil keys, or concurrent access scenarios

Required test additions:

  • Add tests for forward and reverse iteration over prefixed keys
  • Include batch operation tests as required by KVStoreWithBatch interface
  • Add tests for concurrent access safety (the struct has a mutex)
  • Cover edge cases with empty/nil inputs
🔗 Analysis chain

Verify test coverage with additional scenarios

While the test provides good basic coverage, consider adding:

  1. Batch operations testing
  2. Iterator testing if supported by PrefixDB
  3. Performance tests for large datasets
  4. Recovery from panic scenarios

Run the following script to check test coverage:


Let me gather more information about the interface methods and implementations to provide a comprehensive assessment.

🏁 Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Check test coverage for prefixdb package

# Search for PrefixDB methods that might need testing
ast-grep --pattern 'type PrefixDB struct {
  $$$
}'

# Search for interface methods that should be tested
ast-grep --pattern 'type DB interface {
  $$$
}'

Length of output: 547


Script:

#!/bin/bash
# Search for all methods implemented by PrefixDB
ast-grep --pattern 'func (p *PrefixDB) $_($$$) $$$'

# Search for KVStoreWithBatch interface definition
ast-grep --pattern 'type KVStoreWithBatch interface {
  $$$
}'

# Search for any existing iterator or batch related tests
rg -l "Iterator|Batch" store/db/prefixdb_test.go

Length of output: 500


Script:

#!/bin/bash
# Let's check the KVStore interface methods
ast-grep --pattern 'type KVStore interface {
  $$$
}'

# Check PrefixDB implementation for iterator and batch methods
rg -A 5 "func \(p \*PrefixDB\)" store/db/prefixdb.go

# Check if there are any other test files for PrefixDB
fd prefixdb.*test

Length of output: 1513

🧰 Tools
🪛 golangci-lint (1.62.2)

6-6: File is not gci-ed with --skip-generated -s standard -s default -s prefix(cosmossdk.io) -s prefix(github.com/cosmos/cosmos-sdk) --custom-order

(gci)


9-9: File is not gci-ed with --skip-generated -s standard -s default -s prefix(cosmossdk.io) -s prefix(github.com/cosmos/cosmos-sdk) --custom-order

(gci)


49-49: File is not gci-ed with --skip-generated -s standard -s default -s prefix(cosmossdk.io) -s prefix(github.com/cosmos/cosmos-sdk) --custom-order

(gci)


8-8: File is not gofumpt-ed with -extra

(gofumpt)

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