add unit test

viewport/viewport_test.go

@@ -0,0 +1,118 @@
+package viewport
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/charmbracelet/lipgloss"
+)
+
+func Test_SetContent(t *testing.T) {
+	vp := New(0, 0)
+	vp.SetContent("test")
+
+	actual := strings.Join(vp.lines, "\n")
+	expected := "test"
+
+	if actual != expected {
+		t.Errorf("Error: vp.lines = %q, want %q", actual, expected)
+	}
+}
+
+func assertArray(t *testing.T, actual, expected []string) {
+	if len(actual) != len(expected) {
+		t.Errorf("Error: actual = %d, want %d", len(actual), len(expected))
+	}
+
+	for i, actualLine := range actual {
+		if len(actualLine) != len(expected[i]) {
+			t.Errorf("Error: actual = %d, want %d", len(actualLine), len(expected[i]))
+		}
+	}
+
+	actualStr := strings.Join(actual, "\n")
+	expectedStr := strings.Join(expected, "\n")
+
+	if actualStr != expectedStr {
+		t.Errorf("Error: actual = %q, want %q", actualStr, expectedStr)
+	}
+}
+
+func Test_SetContent_WithLargeText(t *testing.T) {
+	content := []string{
+		"this is a really long text that should wrap around the viewport",
+	}
+	vp := New(30, 5)
+	vp.SetContent(strings.Join(content, "\n"))
+
+	assertArray(t, vp.lines, []string{
+		"this is a really long text    ",
+		"that should wrap around the   ",
+		"viewport                      ",
+	})
+}
+
+func Test_SetContent_WithMultipleLineLargeTest(t *testing.T) {
+	content := []string{
+		"this is a really long text that should wrap around the viewport",
+		"this is a really long text that should wrap around the viewport",
+	}
+	vp := New(30, 5)
+	vp.SetContent(strings.Join(content, "\n"))
+
+	assertArray(t, vp.lines, []string{
+		"this is a really long text    ",
+		"that should wrap around the   ",
+		"viewport                      ",
+		"this is a really long text    ",
+		"that should wrap around the   ",
+		"viewport                      ",
+	})
+}
+
+func Test_SetContent_WithStyledLargeText(t *testing.T) {
+	content := []string{
+		lipgloss.NewStyle().Foreground(lipgloss.Color("1")).Render("this ") + "is a really long text that should wrap around the viewport",
+	}
+	vp := New(30, 5)
+	vp.SetContent(strings.Join(content, "\n"))
+
+	assertArray(t, vp.lines, []string{
+		"this is a really long text    ",
+		"that should wrap around the   ",
+		"viewport                      ",
+	})
+}
+
+func Test_SetContent_WithLargeTextWithViewportPadding(t *testing.T) {
+	content := []string{
+		"this is a really long text that should wrap around the viewport",
+	}
+	vp := New(30, 5)
+	vp.Style = lipgloss.NewStyle().Padding(1)
+	vp.SetContent(strings.Join(content, "\n"))
+
+	assertArray(t, vp.lines, []string{
+		"this is a really long text  ",
+		"that should wrap around the ",
+		"viewport                    ",
+	})
+}
+
+func Test_SetContent_WithLargeTextWithWideCharacter(t *testing.T) {
+	content := []string{
+		"this is a really long text that should wrap around the viewport",
+		"これはビューポートを囲む必要がある非常に長い日本語のテキストです",
+	}
+	vp := New(30, 5)
+	vp.SetContent(strings.Join(content, "\n"))
+
+	assertArray(t, vp.lines, []string{
+		"this is a really long text    ",
+		"that should wrap around the   ",
+		"viewport                      ",
+		"これはビューポートを囲む必要が",
+		"ある非常に長い日本語のテキスト",
+		"です                          ",
+	})
+}