feat(tui): file viewer, select messages

packages/tui/internal/layout/flex_test.go

@@ -0,0 +1,90 @@
+package layout
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestFlexGap(t *testing.T) {
+	tests := []struct {
+		name     string
+		opts     FlexOptions
+		items    []FlexItem
+		expected string
+	}{
+		{
+			name: "Row with gap",
+			opts: FlexOptions{
+				Direction: Row,
+				Width:     20,
+				Height:    1,
+				Gap:       2,
+			},
+			items: []FlexItem{
+				{View: "A"},
+				{View: "B"},
+				{View: "C"},
+			},
+			expected: "A  B  C",
+		},
+		{
+			name: "Column with gap",
+			opts: FlexOptions{
+				Direction: Column,
+				Width:     1,
+				Height:    5,
+				Gap:       1,
+				Align:     AlignStart,
+			},
+			items: []FlexItem{
+				{View: "A", FixedSize: 1},
+				{View: "B", FixedSize: 1},
+				{View: "C", FixedSize: 1},
+			},
+			expected: "A\n \nB\n \nC",
+		},
+		{
+			name: "Row with gap and justify space between",
+			opts: FlexOptions{
+				Direction: Row,
+				Width:     15,
+				Height:    1,
+				Gap:       1,
+				Justify:   JustifySpaceBetween,
+			},
+			items: []FlexItem{
+				{View: "A"},
+				{View: "B"},
+				{View: "C"},
+			},
+			expected: "A      B      C",
+		},
+		{
+			name: "No gap specified",
+			opts: FlexOptions{
+				Direction: Row,
+				Width:     10,
+				Height:    1,
+			},
+			items: []FlexItem{
+				{View: "A"},
+				{View: "B"},
+				{View: "C"},
+			},
+			expected: "ABC",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := Render(tt.opts, tt.items...)
+			// Trim any trailing spaces for comparison
+			result = strings.TrimRight(result, " ")
+			expected := strings.TrimRight(tt.expected, " ")
+
+			if result != expected {
+				t.Errorf("Render() = %q, want %q", result, expected)
+			}
+		})
+	}
+}