TestSpec_PublicAPI_CopyFile validates the documented behavior: copies src to dst using buffered I/O, creates dst if not exist, truncates if exists.
(t *testing.T)
| 152 | // TestSpec_PublicAPI_CopyFile validates the documented behavior: |
| 153 | // copies src to dst using buffered I/O, creates dst if not exist, truncates if exists. |
| 154 | func TestSpec_PublicAPI_CopyFile(t *testing.T) { |
| 155 | dir := t.TempDir() |
| 156 | src := filepath.Join(dir, "source.txt") |
| 157 | dst := filepath.Join(dir, "destination.txt") |
| 158 | content := []byte("hello specification test") |
| 159 | |
| 160 | require.NoError(t, os.WriteFile(src, content, 0600)) |
| 161 | |
| 162 | t.Run("copies file content to new destination", func(t *testing.T) { |
| 163 | err := fileutil.CopyFile(src, dst) |
| 164 | require.NoError(t, err, "CopyFile should not error for valid src/dst") |
| 165 | got, err := os.ReadFile(dst) |
| 166 | require.NoError(t, err) |
| 167 | assert.Equal(t, content, got, "destination should have same content as source") |
| 168 | }) |
| 169 | |
| 170 | t.Run("truncates existing destination", func(t *testing.T) { |
| 171 | require.NoError(t, os.WriteFile(dst, []byte("old content that is longer"), 0600)) |
| 172 | err := fileutil.CopyFile(src, dst) |
| 173 | require.NoError(t, err, "CopyFile should not error when destination exists") |
| 174 | got, err := os.ReadFile(dst) |
| 175 | require.NoError(t, err) |
| 176 | assert.Equal(t, content, got, "destination should be truncated and overwritten with source content") |
| 177 | }) |
| 178 | } |
| 179 | |
| 180 | // makeTar builds an in-memory tar archive with named entries. |
| 181 | func makeTar(entries map[string][]byte) []byte { |