Changes to tty/utf16_test.go. All files

tty/utf16_test.go

new file mode 100644@@ -0,0 +1,67 @@+// Copyright 2026 The TCell Authors+//+// Licensed under the Apache License, Version 2.0 (the "License");+// you may not use this file except in compliance with the License.+// You may obtain a copy of the License at+//+//    http://www.apache.org/licenses/LICENSE-2.0+//+// Unless required by applicable law or agreed to in writing, software+// distributed under the License is distributed on an "AS IS" BASIS,+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.+// See the License for the specific language governing permissions and+// limitations under the License.++package tty++import (+	"reflect"+	"testing"+)++func TestDecodeUTF16Rune(t *testing.T) {+	tests := []struct {+		name string+		in   []rune+		want []rune+	}{+		{+			name: "bmp rune",+			in:   []rune{'A'},+			want: []rune{'A'},+		},+		{+			name: "valid surrogate pair",+			in:   []rune{0xD83D, 0xDE00},+			want: []rune{'😀'},+		},+		{+			name: "orphaned high before bmp",+			in:   []rune{0xD83D, ' '},+			want: []rune{'�', ' '},+		},+		{+			name: "orphaned high before high",+			in:   []rune{0xD83D, 0xD83D, 0xDE00},+			want: []rune{'�', '😀'},+		},+		{+			name: "orphaned low",+			in:   []rune{0xDE00},+			want: []rune{'�'},+		},+	}++	for _, tt := range tests {+		t.Run(tt.name, func(t *testing.T) {+			var surrogate rune+			var got []rune+			for _, wc := range tt.in {+				got = append(got, decodeUTF16Rune(&surrogate, wc)...)+			}+			if !reflect.DeepEqual(got, tt.want) {+				t.Fatalf("decodeUTF16Rune(%U) = %U, want %U", tt.in, got, tt.want)+			}+		})+	}+}