1 files changed, 80 insertions, 0 deletions
diff --git a/telegram/formatter/formatter_test.go b/telegram/formatter/formatter_test.go
index c988b10..e4bdd23 100644
--- a/telegram/formatter/formatter_test.go
+++ b/telegram/formatter/formatter_test.go
@@ -392,3 +392,83 @@ func TestFormattingXEP0393Strikethrough(t *testing.T) {
 		t.Errorf("Wrong strikethrough formatting: %v", markup)
 	}
 }
+
+func TestClaspLeft(t *testing.T) {
+	text := "a b c"
+	entities := []*client.TextEntity{
+		&client.TextEntity{
+			Offset: 1,
+			Length: 2,
+		},
+	}
+	entities = ClaspDirectives(text, entities)
+	if !(len(entities) == 1 &&
+		entities[0].Offset == 2 && entities[0].Length == 1) {
+		t.Errorf("Wrong claspleft: %#v", entities)
+	}
+}
+
+func TestClaspBoth(t *testing.T) {
+	text := "a b c"
+	entities := []*client.TextEntity{
+		&client.TextEntity{
+			Offset: 1,
+			Length: 3,
+		},
+	}
+	entities = ClaspDirectives(text, entities)
+	if !(len(entities) == 1 &&
+		entities[0].Offset == 2 && entities[0].Length == 1) {
+		t.Errorf("Wrong claspboth: %#v", entities)
+	}
+}
+
+func TestClaspNotNeeded(t *testing.T) {
+	text := " abc "
+	entities := []*client.TextEntity{
+		&client.TextEntity{
+			Offset: 1,
+			Length: 3,
+		},
+	}
+	entities = ClaspDirectives(text, entities)
+	if !(len(entities) == 1 &&
+		entities[0].Offset == 1 && entities[0].Length == 3) {
+		t.Errorf("Wrong claspnotneeded: %#v", entities)
+	}
+}
+
+func TestClaspNested(t *testing.T) {
+	text := "a b c"
+	entities := []*client.TextEntity{
+		&client.TextEntity{
+			Offset: 1,
+			Length: 3,
+		},
+		&client.TextEntity{
+			Offset: 2,
+			Length: 2,
+		},
+	}
+	entities = ClaspDirectives(text, entities)
+	if !(len(entities) == 2 &&
+		entities[0].Offset == 2 && entities[0].Length == 1 &&
+		entities[1].Offset == 2 && entities[1].Length == 1) {
+		t.Errorf("Wrong claspnested: %#v", entities)
+	}
+}
+
+func TestClaspEmoji(t *testing.T) {
+	text := "a 🐖 c"
+	entities := []*client.TextEntity{
+		&client.TextEntity{
+			Offset: 1,
+			Length: 4,
+		},
+	}
+	entities = ClaspDirectives(text, entities)
+	if !(len(entities) == 1 &&
+		entities[0].Offset == 2 && entities[0].Length == 2) {
+		t.Errorf("Wrong claspemoji: %#v", entities)
+	}
+}