resultFileName:     "user-defined.conf",
			expectedOutputFile: testDataDir + "/expected/YYY-istio-cni.conf",
		},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			t.Logf("%s: Test preconf %s, expected %s", tc.name, tc.preConfFile, tc.expectedOutputFile)
			install.RunInstallCNITest(t, tc.chainedCNIPlugin, tc.preConfFile, tc.resultFileName, tc.delayedConfFile, tc.expectedOutputFile,

				p := make([]byte, 50)
				n, err := br.Read(p)
				if err != wantErr || n != len(s) || string(p[:n]) != s {
					t.Fatalf("read(%d) = %q, %v, want %q, %v", len(p), string(p[:n]), err, s, wantErr)
				}
				t.Logf("read(%d) = %q, %v", len(p), string(p[:n]), err)
			}
			want("abc", nil)
			want("", nil)
			want("def", nil)
			want("", io.EOF)
		})
	}
}

func TestReaderReset(t *testing.T) {