test: add screen manipulation tests

screen_test.go

@@ -0,0 +1,66 @@
+package tea
+
+import (
+	"bytes"
+	"testing"
+)
+
+func TestClearMsg(t *testing.T) {
+	tests := []struct {
+		name     string
+		cmds     sequenceMsg
+		expected string
+	}{
+		{
+			name:     "clear_screen",
+			cmds:     []Cmd{ClearScreen},
+			expected: "\x1b[?25l\x1b[2J\x1b[1;1H\x1b[1;1Hsuccess\r\n\x1b[0D\x1b[2K\x1b[?1002l\x1b[?1003l\x1b[?25h",
+		},
+		{
+			name:     "altscreen",
+			cmds:     []Cmd{EnterAltScreen, ExitAltScreen},
+			expected: "\x1b[?25l\x1b[?1049h\x1b[2J\x1b[1;1H\x1b[1;1H\x1b[?1049lsuccess\r\n\x1b[0D\x1b[2K\x1b[?1002l\x1b[?1003l\x1b[?25h",
+		},
+		{
+			name:     "altscreen_autoexit",
+			cmds:     []Cmd{EnterAltScreen},
+			expected: "\x1b[?25l\x1b[?1049h\x1b[2J\x1b[1;1H\x1b[1;1Hsuccess\r\n\x1b[2;0H\x1b[2K\x1b[?1049l\x1b[?1002l\x1b[?1003l\x1b[?25h",
+		},
+		{
+			name:     "mouse_cellmotion",
+			cmds:     []Cmd{EnableMouseCellMotion},
+			expected: "\x1b[?25l\x1b[?1002hsuccess\r\n\x1b[0D\x1b[2K\x1b[?1002l\x1b[?1003l\x1b[?25h",
+		},
+		{
+			name:     "mouse_allmotion",
+			cmds:     []Cmd{EnableMouseAllMotion},
+			expected: "\x1b[?25l\x1b[?1003hsuccess\r\n\x1b[0D\x1b[2K\x1b[?1002l\x1b[?1003l\x1b[?25h",
+		},
+		{
+			name:     "cursor_hide",
+			cmds:     []Cmd{HideCursor},
+			expected: "\x1b[?25l\x1b[?25lsuccess\r\n\x1b[0D\x1b[2K\x1b[?1002l\x1b[?1003l\x1b[?25h",
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			var buf bytes.Buffer
+			var in bytes.Buffer
+
+			m := &testModel{}
+			p := NewProgram(m, WithInput(&in), WithOutput(&buf))
+
+			test.cmds = append(test.cmds, Quit)
+			go p.Send(test.cmds)
+
+			if _, err := p.Run(); err != nil {
+				t.Fatal(err)
+			}
+
+			if buf.String() != test.expected {
+				t.Errorf("expected embedded sequence, got %q", buf.String())
+			}
+		})
+	}
+}