1 files changed, 63 insertions, 0 deletions
diff --git a/ui/buffers_test.go b/ui/buffers_test.go
new file mode 100644
index 0000000..fdcbece
--- /dev/null
+++ b/ui/buffers_test.go
@@ -0,0 +1,63 @@
+package ui
+
+import "testing"
+
+func assertSplitPoints(t *testing.T, line string, expected []Point) {
+	l := Line{Content: line}
+	l.computeSplitPoints()
+
+	if len(l.SplitPoints) != len(expected) {
+		t.Errorf("%q: expected %d split points got %d", line, len(expected), len(l.SplitPoints))
+	}
+
+	for i := 0; i < len(expected); i++ {
+		e := expected[i]
+		a := l.SplitPoints[i]
+
+		if e.X != a.X {
+			t.Errorf("%q, point #%d: expected X=%d got %d", line, i, e.X, a.X)
+		}
+		if e.I != a.I {
+			t.Errorf("%q, point #%d: expected I=%d got %d", line, i, e.I, a.I)
+		}
+	}
+}
+
+func TestLineSplitPoints(t *testing.T) {
+	assertSplitPoints(t, "hello", []Point{
+		{X: 5, I: 5},
+	})
+	assertSplitPoints(t, "hello world", []Point{
+		{X: 5, I: 5},
+		{X: 11, I: 11},
+	})
+	assertSplitPoints(t, "lorem ipsum dolor shit amet", []Point{
+		{X: 5, I: 5},
+		{X: 11, I: 11},
+		{X: 17, I: 17},
+		{X: 22, I: 22},
+		{X: 27, I: 27},
+	})
+}
+
+func assertRenderedHeight(t *testing.T, line string, width int, expected int) {
+	l := Line{Content: line}
+	l.computeSplitPoints()
+	l.Invalidate()
+
+	actual := l.RenderedHeight(width)
+
+	if actual != expected {
+		t.Errorf("%q (width=%d) expected to take %d lines, takes %d", line, width, expected, actual)
+	}
+}
+
+func TestRenderedHeight(t *testing.T) {
+	assertRenderedHeight(t, "hello world", 100, 1)
+	assertRenderedHeight(t, "hello world", 10, 2)
+
+	assertRenderedHeight(t, "have a good day!", 100, 1)
+	assertRenderedHeight(t, "have a good day!", 10, 2)
+	assertRenderedHeight(t, "have a good day!", 6, 3)
+	assertRenderedHeight(t, "have a good day!", 4, 4)
+}