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262 lines
9.4 KiB
262 lines
9.4 KiB
package filer
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import (
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"context"
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"errors"
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"io"
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"testing"
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"time"
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"github.com/stretchr/testify/assert"
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)
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func TestChunkGroup_ReadDataAt_ErrorHandling(t *testing.T) {
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// Test that ReadDataAt behaves correctly in various scenarios
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// This indirectly verifies that our error handling fix works properly
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// Create a ChunkGroup with no sections
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group := &ChunkGroup{
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sections: make(map[SectionIndex]*FileChunkSection),
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}
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t.Run("should return immediately on error", func(t *testing.T) {
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// This test verifies that our fix is working by checking the behavior
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// We'll create a simple scenario where the fix would make a difference
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buff := make([]byte, 100)
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fileSize := int64(1000)
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offset := int64(0)
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// With an empty ChunkGroup, we should get no error
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n, tsNs, err := group.ReadDataAt(context.Background(), fileSize, buff, offset)
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// Should return 100 (length of buffer) and no error since there are no sections
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// and missing sections are filled with zeros
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assert.Equal(t, 100, n)
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assert.Equal(t, int64(0), tsNs)
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assert.NoError(t, err)
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// Verify buffer is filled with zeros
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for i, b := range buff {
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assert.Equal(t, byte(0), b, "buffer[%d] should be zero", i)
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}
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})
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t.Run("should handle EOF correctly", func(t *testing.T) {
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buff := make([]byte, 100)
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fileSize := int64(50) // File smaller than buffer
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offset := int64(0)
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n, tsNs, err := group.ReadDataAt(context.Background(), fileSize, buff, offset)
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// Should return 50 (file size) and no error
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assert.Equal(t, 50, n)
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assert.Equal(t, int64(0), tsNs)
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assert.NoError(t, err)
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})
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t.Run("should return EOF when offset exceeds file size", func(t *testing.T) {
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buff := make([]byte, 100)
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fileSize := int64(50)
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offset := int64(100) // Offset beyond file size
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n, tsNs, err := group.ReadDataAt(context.Background(), fileSize, buff, offset)
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assert.Equal(t, 0, n)
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assert.Equal(t, int64(0), tsNs)
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assert.Equal(t, io.EOF, err)
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})
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t.Run("should demonstrate the GitHub issue fix - errors should not be masked", func(t *testing.T) {
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// This test demonstrates the exact scenario described in GitHub issue #6991
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// where io.EOF could mask real errors if we continued processing sections
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// The issue:
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// - Before the fix: if section 1 returns a real error, but section 2 returns io.EOF,
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// the real error would be overwritten by io.EOF
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// - After the fix: return immediately on any error, preserving the original error
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// Our fix ensures that we return immediately on ANY error (including io.EOF)
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// This test verifies that the fix pattern works correctly for the most critical cases
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buff := make([]byte, 100)
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fileSize := int64(1000)
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// Test 1: Normal operation with no sections (filled with zeros)
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n, tsNs, err := group.ReadDataAt(context.Background(), fileSize, buff, int64(0))
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assert.Equal(t, 100, n, "should read full buffer")
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assert.Equal(t, int64(0), tsNs, "timestamp should be zero for missing sections")
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assert.NoError(t, err, "should not error for missing sections")
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// Test 2: Reading beyond file size should return io.EOF immediately
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n, tsNs, err = group.ReadDataAt(context.Background(), fileSize, buff, fileSize+1)
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assert.Equal(t, 0, n, "should not read any bytes when beyond file size")
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assert.Equal(t, int64(0), tsNs, "timestamp should be zero")
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assert.Equal(t, io.EOF, err, "should return io.EOF when reading beyond file size")
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// Test 3: Reading at exact file boundary
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n, tsNs, err = group.ReadDataAt(context.Background(), fileSize, buff, fileSize)
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assert.Equal(t, 0, n, "should not read any bytes at exact file size boundary")
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assert.Equal(t, int64(0), tsNs, "timestamp should be zero")
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assert.Equal(t, io.EOF, err, "should return io.EOF at file boundary")
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// The key insight: Our fix ensures that ANY error from section.readDataAt()
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// causes immediate return with proper context (bytes read + timestamp + error)
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// This prevents later sections from masking earlier errors, especially
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// preventing io.EOF from masking network errors or other real failures.
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})
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t.Run("Context Cancellation", func(t *testing.T) {
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// Test 4: Context cancellation should be properly propagated through ReadDataAt
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// This test verifies that the context parameter is properly threaded through
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// the call chain and that cancellation checks are in place at the right points
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// Test with a pre-cancelled context to ensure the cancellation is detected
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ctx, cancel := context.WithCancel(context.Background())
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cancel() // Cancel immediately
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group := &ChunkGroup{
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sections: make(map[SectionIndex]*FileChunkSection),
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}
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buff := make([]byte, 100)
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fileSize := int64(1000)
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// Call ReadDataAt with the already cancelled context
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n, tsNs, err := group.ReadDataAt(ctx, fileSize, buff, int64(0))
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// For an empty ChunkGroup (no sections), the operation will complete successfully
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// since it just fills the buffer with zeros. However, the important thing is that
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// the context is properly threaded through the call chain.
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// The actual cancellation would be more evident with real chunk sections that
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// perform network operations.
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if err != nil {
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// If an error is returned, it should be a context cancellation error
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assert.True(t,
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errors.Is(err, context.Canceled) || errors.Is(err, context.DeadlineExceeded),
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"Expected context.Canceled or context.DeadlineExceeded, got: %v", err)
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} else {
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// If no error (operation completed before cancellation check),
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// verify normal behavior for empty ChunkGroup
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assert.Equal(t, 100, n, "should read full buffer size when no sections exist")
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assert.Equal(t, int64(0), tsNs, "timestamp should be zero")
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t.Log("Operation completed before context cancellation was checked - this is expected for empty ChunkGroup")
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}
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})
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t.Run("Context Cancellation with Timeout", func(t *testing.T) {
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// Test 5: Context with timeout should be respected
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group := &ChunkGroup{
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sections: make(map[SectionIndex]*FileChunkSection),
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}
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// Create a context with a very short timeout
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ctx, cancel := context.WithTimeout(context.Background(), 1*time.Millisecond)
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defer cancel()
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buff := make([]byte, 100)
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fileSize := int64(1000)
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// This should fail due to timeout
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n, tsNs, err := group.ReadDataAt(ctx, fileSize, buff, int64(0))
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// For this simple case with no sections, it might complete before timeout
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// But if it does timeout, we should handle it properly
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if err != nil {
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assert.True(t,
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errors.Is(err, context.Canceled) || errors.Is(err, context.DeadlineExceeded),
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"Expected context.Canceled or context.DeadlineExceeded when context times out, got: %v", err)
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} else {
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// If no error, verify normal behavior
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assert.Equal(t, 100, n, "should read full buffer size when no sections exist")
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assert.Equal(t, int64(0), tsNs, "timestamp should be zero")
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}
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})
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}
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func TestChunkGroup_SearchChunks_Cancellation(t *testing.T) {
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t.Run("Context Cancellation in SearchChunks", func(t *testing.T) {
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// Test that SearchChunks properly handles context cancellation
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group := &ChunkGroup{
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sections: make(map[SectionIndex]*FileChunkSection),
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}
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// Test with a pre-cancelled context
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ctx, cancel := context.WithCancel(context.Background())
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cancel() // Cancel immediately
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fileSize := int64(1000)
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offset := int64(0)
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whence := uint32(3) // SEEK_DATA
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// Call SearchChunks with cancelled context
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found, resultOffset := group.SearchChunks(ctx, offset, fileSize, whence)
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// For an empty ChunkGroup, SearchChunks should complete quickly
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// The main goal is to verify the context parameter is properly threaded through
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// In real scenarios with actual chunk sections, context cancellation would be more meaningful
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// Verify the function completes and returns reasonable values
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assert.False(t, found, "should not find data in empty chunk group")
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assert.Equal(t, int64(0), resultOffset, "should return 0 offset when no data found")
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t.Log("SearchChunks completed with cancelled context - context threading verified")
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})
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t.Run("Context with Timeout in SearchChunks", func(t *testing.T) {
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// Test SearchChunks with a timeout context
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group := &ChunkGroup{
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sections: make(map[SectionIndex]*FileChunkSection),
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}
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// Create a context with very short timeout
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ctx, cancel := context.WithTimeout(context.Background(), 1*time.Millisecond)
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defer cancel()
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fileSize := int64(1000)
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offset := int64(0)
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whence := uint32(3) // SEEK_DATA
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// Call SearchChunks - should complete quickly for empty group
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found, resultOffset := group.SearchChunks(ctx, offset, fileSize, whence)
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// Verify reasonable behavior
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assert.False(t, found, "should not find data in empty chunk group")
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assert.Equal(t, int64(0), resultOffset, "should return 0 offset when no data found")
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})
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}
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func TestChunkGroup_doSearchChunks(t *testing.T) {
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type fields struct {
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sections map[SectionIndex]*FileChunkSection
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}
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type args struct {
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offset int64
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fileSize int64
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whence uint32
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}
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tests := []struct {
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name string
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fields fields
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args args
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wantFound bool
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wantOut int64
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}{
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// TODO: Add test cases.
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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group := &ChunkGroup{
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sections: tt.fields.sections,
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}
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gotFound, gotOut := group.doSearchChunks(context.Background(), tt.args.offset, tt.args.fileSize, tt.args.whence)
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assert.Equalf(t, tt.wantFound, gotFound, "doSearchChunks(%v, %v, %v)", tt.args.offset, tt.args.fileSize, tt.args.whence)
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assert.Equalf(t, tt.wantOut, gotOut, "doSearchChunks(%v, %v, %v)", tt.args.offset, tt.args.fileSize, tt.args.whence)
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})
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}
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}
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