nvim: add extmarks testcase

Author: zchee

nvim/nvim_test.go

@@ -609,6 +609,64 @@ func TestAPI(t *testing.T) {
 			t.Fatal("expected result to nil")
 		}
 	})
+
+	t.Run("extmarks", func(t *testing.T) {
+		clearBuffer(t, v, 0) // clear curret buffer text
+
+		lines := [][]byte{[]byte("hello"), []byte("world")}
+		if err := v.SetBufferLines(Buffer(0), 0, -1, true, lines); err != nil {
+			t.Fatal(err)
+		}
+
+		nsID, err := v.CreateNamespace("test_extmarks")
+		if err != nil {
+			t.Fatal(err)
+		}
+		const (
+			extMarkID = 10
+			wantLine  = 1
+			wantCol   = 3
+		)
+		gotExtMarkID, err := v.SetBufferExtmark(Buffer(0), nsID, extMarkID, wantLine, wantCol, make(map[string]interface{}))
+		if err != nil {
+			t.Fatal(err)
+		}
+		if gotExtMarkID != extMarkID {
+			t.Fatalf("got %d extMarkID but want %d", gotExtMarkID, extMarkID)
+		}
+
+		extmarks, err := v.BufferExtmarks(Buffer(0), nsID, 0, -1, make(map[string]interface{}))
+		if err != nil {
+			t.Fatal(err)
+		}
+		if len(extmarks) > 1 {
+			t.Fatalf("expected extmarks length to 1 but %d", len(extmarks))
+		}
+		if extmarks[0].ExtmarkID != gotExtMarkID {
+			t.Fatalf("got %d extMarkID but want %d", extmarks[0].ExtmarkID, extMarkID)
+		}
+		if extmarks[0].Row != wantLine {
+			t.Fatalf("got %d extmarks Row but want %d", extmarks[0].Row, wantLine)
+		}
+		if extmarks[0].Col != wantCol {
+			t.Fatalf("got %d extmarks Col but want %d", extmarks[0].Col, wantCol)
+		}
+
+		pos, err := v.BufferExtmarkByID(Buffer(0), nsID, gotExtMarkID)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if pos[0] != wantLine {
+			t.Fatalf("got %d extMark line but want %d", pos[0], wantLine)
+		}
+		if pos[1] != wantCol {
+			t.Fatalf("got %d extMark col but want %d", pos[1], wantCol)
+		}
+
+		if err := v.ClearBufferNamespace(Buffer(0), nsID, 0, -1); err != nil {
+			t.Fatal(err)
+		}
+	})
 }
 
 func TestDial(t *testing.T) {