irc: add isHighlight tests

irc_test.go

@@ -0,0 +1,34 @@
+package soju
+
+import (
+	"testing"
+)
+
+func TestIsHighlight(t *testing.T) {
+	nick := "SojuUser"
+	testCases := []struct {
+		name string
+		text string
+		hl   bool
+	}{
+		{"noContains", "hi there Soju User!", false},
+		{"middle", "hi there SojuUser!", true},
+		{"start", "SojuUser: how are you doing?", true},
+		{"end", "maybe ask SojuUser", true},
+		{"inWord", "but OtherSojuUserSan is a different nick", false},
+		{"startWord", "and OtherSojuUser is another different nick", false},
+		{"endWord", "and SojuUserSan is yet a different nick", false},
+		{"underscore", "and SojuUser_san has nothing to do with me", false},
+		{"zeroWidthSpace", "writing S\u200BojuUser shouldn't trigger a highlight", false},
+	}
+
+	for _, tc := range testCases {
+		tc := tc // capture range variable
+		t.Run(tc.name, func(t *testing.T) {
+			hl := isHighlight(tc.text, nick)
+			if hl != tc.hl {
+				t.Errorf("isHighlight(%q, %q) = %v, but want %v", tc.text, nick, hl, tc.hl)
+			}
+		})
+	}
+}