New

core/internal/cover/profile_test.go

@@ -0,0 +1,41 @@
+package cover
+
+import (
+	"bytes"
+	"testing"
+)
+
+func TestProfileRoundTripAcrossRange(t *testing.T) {
+	for id := 0; id < 65536; id += 257 {
+		for _, xor := range []bool{false, true} {
+			for _, clear := range []bool{false, true} {
+				want := Profile{Enabled: true, ID: uint16(id), Padding: uint16(id % (MaxPadding + 1)), HeaderMask: byte(id), XOR: xor, Clear: clear}
+				encoded, err := EncodePreface(want)
+				if err != nil {
+					t.Fatal(err)
+				}
+				got, ok := DecodePreface(encoded)
+				if !ok || got != want {
+					t.Fatalf("id=%04x xor=%t clear=%t got=%+v ok=%t", id, xor, clear, got, ok)
+				}
+			}
+		}
+	}
+}
+
+func TestWritePrefaceIncludesFixedPadding(t *testing.T) {
+	p := Profile{Enabled: true, ID: 0x1234, Padding: 64, HeaderMask: 0x9a, XOR: true}
+	var out bytes.Buffer
+	if err := WritePreface(&out, p); err != nil {
+		t.Fatal(err)
+	}
+	if out.Len() != PrefaceSize+64 {
+		t.Fatalf("length=%d", out.Len())
+	}
+	var encoded [PrefaceSize]byte
+	copy(encoded[:], out.Bytes())
+	got, ok := DecodePreface(encoded)
+	if !ok || got != p {
+		t.Fatalf("got=%+v ok=%t", got, ok)
+	}
+}