add zip and parity stuff

fileUtilities/parity_test.go

@@ -0,0 +1,70 @@
+package fileUtilities
+
+import (
+	"bytes"
+	"io"
+	"testing"
+)
+
+func Test_createParityFile(t *testing.T) {
+	type args struct {
+		in1 io.Reader
+		in2 io.Reader
+	}
+	tests := []struct {
+		name    string
+		args    args
+		wantOut string
+		wantErr bool
+	}{
+		{
+			name: "create parity file",
+			args: args{
+				in1: bytes.NewBuffer([]byte{0, 1, 2, 3, 4, 5, 6, 7}),
+				in2: bytes.NewBuffer([]byte{7, 6, 5, 4, 3, 2, 1, 0}),
+			},
+			wantOut: string([]byte{7, 7, 7, 7, 7, 7, 7, 7}),
+			wantErr: false,
+		},
+		{
+			name: "in1 is longer than in2",
+			args: args{
+				in1: bytes.NewBuffer([]byte{0, 1, 2, 3, 4, 5, 6, 7, 8}),
+				in2: bytes.NewBuffer([]byte{7, 6, 5, 4, 3, 2, 1, 0}),
+			},
+			wantOut: string([]byte{7, 7, 7, 7, 7, 7, 7, 7, 8}),
+			wantErr: false,
+		},
+		{
+			name: "in2 is longer than in1",
+			args: args{
+				in1: bytes.NewBuffer([]byte{0, 1, 2, 3, 4, 5, 6, 7}),
+				in2: bytes.NewBuffer([]byte{7, 6, 5, 4, 3, 2, 1, 0, 54}),
+			},
+			wantOut: string([]byte{7, 7, 7, 7, 7, 7, 7, 7, 54}),
+			wantErr: false,
+		},
+		{
+			name: "parity recreates original file",
+			args: args{
+				in1: bytes.NewBuffer([]byte{0, 1, 2, 3, 4, 5, 6, 7}),
+				in2: bytes.NewBuffer([]byte{7, 7, 7, 7, 7, 7, 7, 7, 54}),
+			},
+			wantOut: string([]byte{7, 6, 5, 4, 3, 2, 1, 0, 54}),
+			wantErr: false,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			out := &bytes.Buffer{}
+			err := parityStream(tt.args.in1, tt.args.in2, out)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("parityStream() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if gotOut := out.String(); gotOut != tt.wantOut {
+				t.Errorf("parityStream() gotOut = %v, want %v", gotOut, tt.wantOut)
+			}
+		})
+	}
+}