Add test for loader widget

widgets/loader_test.go

@@ -0,0 +1,33 @@
+package widgets
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestLoader(t *testing.T) {
+	l := NewLoader(100)
+
+	for i := 1; i < 100; i++ {
+		l.Inc()
+		got := l.Progress()
+		if int(got) != i {
+			t.Fatalf("Expect progress to be %d%%, but got %.f%%", i, got)
+		}
+
+		gotText := l.text()
+		expectedText := fmt.Sprintf("Loading %d%%...", i)
+		if gotText != expectedText {
+			t.Fatalf("Expect text to be %s, but got %s", expectedText, gotText)
+		}
+	}
+
+	// 100%
+	l.Inc()
+	if l.Progress() != 100.0 {
+		t.Fatalf("Expect progress to be 100%%, but got %.f%%", l.Progress())
+	}
+	if l.text() != "Completed" {
+		t.Fatalf("Expect text to be \"Completed\", but got %s", l.text())
+	}
+}