test format

app/main_test.go

@@ -0,0 +1,29 @@
+package main
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestFormat(t *testing.T) {
+	tbl := []struct {
+		inp  string
+		out  string
+		size int
+	}{
+		{"blah", "blah", 100},
+		{"blah <p>xyx</p>", "blah xyx", 100},
+		{"blah <p>xyx</p> something 122 abcdefg 12345 qwer", "blah xyx ...", 15},
+		{"blah <p>xyx</p> something 122 abcdefg 12345 qwerty", "blah xyx something ...", 20},
+		{"<p>xyx</p><title>", "xyx", 20},
+	}
+
+	for i, tt := range tbl {
+		t.Run(fmt.Sprintf("check-%d", i), func(t *testing.T) {
+			out := format(tt.inp, tt.size)
+			assert.Equal(t, tt.out, out)
+		})
+	}
+}