Function TestScanDeltaDetectsContentChanges

agent/agentgit/agentgit_test.go:325–387

(t *testing.T)

}

func TestScanDeltaDetectsContentChanges(t *testing.T) {
	t.Parallel()

	repoDir := initTestRepo(t)
	logger := slogtest.Make(t, nil)

	h := agentgit.NewHandler(logger)

	// Modify a committed file.
	readmePath := filepath.Join(repoDir, "README.md")
	require.NoError(t, os.WriteFile(readmePath, []byte("# Edit 1\n"), 0o600))

	h.Subscribe([]string{readmePath})
	ctx := context.Background()

	// First scan — returns the initial dirty state.
	msg1 := h.Scan(ctx)
	require.NotNil(t, msg1)
	require.Len(t, msg1.Repositories, 1)

	require.Contains(t, msg1.Repositories[0].UnifiedDiff, "README.md")

	// Second scan with no changes: heartbeat, no repositories.
	msg2 := h.Scan(ctx)
	require.NotNil(t, msg2, "heartbeat should fire even with no delta")
	require.Empty(t, msg2.Repositories)

	// Now modify the SAME file further (still "Modified" status, but
	// different content).
	require.NoError(t, os.WriteFile(readmePath, []byte("# Edit 2\nMore lines\nEven more\n"), 0o600))

	// Third scan — should detect the content change even though the
	// status is still "Modified".
	msg3 := h.Scan(ctx)
	require.NotNil(t, msg3, "content change in already-dirty file should emit delta")
	require.Len(t, msg3.Repositories, 1)

	require.Contains(t, msg3.Repositories[0].UnifiedDiff, "README.md")

	// Also test an untracked (unstaged) file — its status is "Added"
	// throughout, but further edits should still emit deltas.
	untrackedPath := filepath.Join(repoDir, "untracked.go")
	require.NoError(t, os.WriteFile(untrackedPath, []byte("package main\n"), 0o600))

	h.Subscribe([]string{untrackedPath})
	msg4 := h.Scan(ctx)
	require.NotNil(t, msg4)

	require.Contains(t, msg4.Repositories[0].UnifiedDiff, "untracked.go")

	// No changes: heartbeat, no repositories.
	msg5 := h.Scan(ctx)
	require.NotNil(t, msg5, "heartbeat should fire even with no delta")
	require.Empty(t, msg5.Repositories)

	// Modify the untracked file further.
	require.NoError(t, os.WriteFile(untrackedPath, []byte("package main\n\nfunc init() {}\n"), 0o600))