Add tests for EnvelopeFrom and EnvelopeFromFormat methods

Implemented comprehensive tests for the EnvelopeFrom and EnvelopeFromFormat methods to ensure proper handling of valid and invalid email addresses. This includes validation of both address and format for the "EnvelopeFrom" header.

msg_test.go

@@ -645,6 +645,40 @@ func TestMsg_SetAddrHeader(t *testing.T) {
 			})
 		}
 	})
+	t.Run("SetAddrHeader with valid address and name", func(t *testing.T) {
+		for _, tt := range addrHeaderTests {
+			t.Run(tt.name, func(t *testing.T) {
+				message := NewMsg()
+				if message == nil {
+					t.Fatal("message is nil")
+				}
+				if err := message.SetAddrHeader(tt.header, fmt.Sprintf("%q <%s>", "Toni Tester",
+					"toni.tester@example.com")); err != nil {
+					t.Fatalf("failed to set address header, err: %s", err)
+				}
+				addresses, ok := message.addrHeader[tt.header]
+				if !ok {
+					t.Fatalf("failed to set address header, addrHeader field for %s is not set", tt.header)
+				}
+				if len(addresses) != 1 {
+					t.Fatalf("failed to set address header, addrHeader value count for %s is %d, want: 1",
+						tt.header, len(addresses))
+				}
+				if addresses[0].Address != "toni.tester@example.com" {
+					t.Errorf("failed to set address header, addrHeader value for %s is %s, want: %s", tt.header,
+						addresses[0].Address, "toni.tester@example.com")
+				}
+				if addresses[0].String() != `"Toni Tester" <toni.tester@example.com>` {
+					t.Errorf("failed to set address header, addrHeader value for %s is %s, want: %s", tt.header,
+						addresses[0].String(), `"Toni Tester" <toni.tester@example.com>`)
+				}
+				if addresses[0].Name != "Toni Tester" {
+					t.Errorf("failed to set address header, addrHeader name for %s expected to be %s, "+
+						"got: %s", tt.header, "Toni Tester", addresses[0].Name)
+				}
+			})
+		}
+	})
 	t.Run("SetAddrHeader with multiple addresses", func(t *testing.T) {
 		for _, tt := range addrHeaderTests {
 			t.Run(tt.name, func(t *testing.T) {
@@ -982,6 +1016,103 @@ func TestMsg_SetAddrHeaderIgnoreInvalid(t *testing.T) {
 	})
 }
 
+func TestMsg_EnvelopeFrom(t *testing.T) {
+	t.Run("EnvelopeFrom with valid address", func(t *testing.T) {
+		message := NewMsg()
+		if message == nil {
+			t.Fatal("message is nil")
+		}
+		if err := message.EnvelopeFrom("toni.tester@example.com"); err != nil {
+			t.Fatalf("failed to set envelope from: %s", err)
+		}
+		addresses, ok := message.addrHeader[HeaderEnvelopeFrom]
+		if !ok {
+			t.Fatalf("failed to set envelope from, addrHeader field is not set")
+		}
+		if len(addresses) != 1 {
+			t.Errorf("failed to set envelope from, addrHeader value count is: %d, want: 1", len(addresses))
+		}
+		if addresses[0].Address != "toni.tester@example.com" {
+			t.Errorf("failed to set envelope from, addrHeader value is %s, want: %s", addresses[0].Address,
+				"toni.tester@example.com")
+		}
+		if addresses[0].String() != "<toni.tester@example.com>" {
+			t.Errorf("failed to set envelope from, addrHeader value is %s, want: %s", addresses[0].String(),
+				"<toni.tester@example.com>")
+		}
+		if addresses[0].Name != "" {
+			t.Errorf("failed to set envelope from, addrHeader name is %s, want: empty", addresses[0].Name)
+		}
+	})
+	t.Run("EnvelopeFrom with invalid address", func(t *testing.T) {
+		message := NewMsg()
+		if message == nil {
+			t.Fatal("message is nil")
+		}
+		if err := message.EnvelopeFrom("invalid"); err == nil {
+			t.Fatalf("EnvelopeFrom should fail with invalid address")
+		}
+	})
+	t.Run("EnvelopeFrom with empty string should fail", func(t *testing.T) {
+		message := NewMsg()
+		if message == nil {
+			t.Fatal("message is nil")
+		}
+		if err := message.EnvelopeFrom(""); err == nil {
+			t.Fatalf("EnvelopeFrom should fail with invalid address")
+		}
+	})
+}
+
+func TestMsg_EnvelopeFromFormat(t *testing.T) {
+	t.Run("EnvelopeFromFormat with valid address", func(t *testing.T) {
+		message := NewMsg()
+		if message == nil {
+			t.Fatal("message is nil")
+		}
+		if err := message.EnvelopeFromFormat("Toni Tester", "toni.tester@example.com"); err != nil {
+			t.Fatalf("failed to set envelope from: %s", err)
+		}
+		addresses, ok := message.addrHeader[HeaderEnvelopeFrom]
+		if !ok {
+			t.Fatalf("failed to set envelope from, addrHeader field is not set")
+		}
+		if len(addresses) != 1 {
+			t.Errorf("failed to set envelope from, addrHeader value count is: %d, want: 1", len(addresses))
+		}
+		if addresses[0].Address != "toni.tester@example.com" {
+			t.Errorf("failed to set envelope from, addrHeader value is %s, want: %s", addresses[0].Address,
+				"toni.tester@example.com")
+		}
+		if addresses[0].String() != `"Toni Tester" <toni.tester@example.com>` {
+			t.Errorf("failed to set envelope from, addrHeader value is %s, want: %s", addresses[0].String(),
+				"<toni.tester@example.com>")
+		}
+		if addresses[0].Name != "Toni Tester" {
+			t.Errorf("failed to set envelope from, addrHeader name is %s, want: %s", addresses[0].Name,
+				"Toni Tester")
+		}
+	})
+	t.Run("EnvelopeFromFormat with invalid address", func(t *testing.T) {
+		message := NewMsg()
+		if message == nil {
+			t.Fatal("message is nil")
+		}
+		if err := message.EnvelopeFromFormat("Toni Tester", "invalid"); err == nil {
+			t.Fatalf("EnvelopeFromFormat should fail with invalid address")
+		}
+	})
+	t.Run("EnvelopeFromFormat with empty string should fail", func(t *testing.T) {
+		message := NewMsg()
+		if message == nil {
+			t.Fatal("message is nil")
+		}
+		if err := message.EnvelopeFromFormat("", ""); err == nil {
+			t.Fatalf("EnvelopeFromFormat should fail with invalid address")
+		}
+	})
+}
+
 /*
 // TestNewMsgWithMiddleware tests WithMiddleware