Coverage decorator (#384)

Add code coverage for colors and decorators.

src/ftxui/dom/border_test.cpp

@@ -0,0 +1,96 @@
+#include <gtest/gtest-message.h>  // for Message
+#include <gtest/gtest-test-part.h>  // for SuiteApiResolver, TestFactoryImpl, TestPartResult
+#include "gtest/gtest_pred_impl.h"       // for Test, EXPECT_EQ, TEST
+#include <string>                   // for allocator
+#include "ftxui/dom/elements.hpp"        // for text, flexbox
+#include "ftxui/screen/screen.hpp"       // for Screen
+
+namespace ftxui {
+
+TEST(BorderTest, Default) {
+  auto element = text("text") | border;
+  Screen screen(5, 3);
+  Render(screen, element);
+  EXPECT_EQ(screen.ToString(),
+            "╭───╮\r\n"
+            "│tex│\r\n"
+            "╰───╯");
+}
+
+TEST(BorderTest, Light) {
+  auto element = text("text") | borderLight;
+  Screen screen(5, 3);
+  Render(screen, element);
+  EXPECT_EQ(screen.ToString(),
+            "┌───┐\r\n"
+            "│tex│\r\n"
+            "└───┘");
+}
+
+TEST(BorderTest, Double) {
+  auto element = text("text") | borderDouble;
+  Screen screen(5, 3);
+  Render(screen, element);
+  EXPECT_EQ(screen.ToString(),
+            "╔═══╗\r\n"
+            "║tex║\r\n"
+            "╚═══╝");
+}
+
+TEST(BorderTest, Rounded) {
+  auto element = text("text") | borderRounded;
+  Screen screen(5, 3);
+  Render(screen, element);
+  EXPECT_EQ(screen.ToString(),
+            "╭───╮\r\n"
+            "│tex│\r\n"
+            "╰───╯");
+}
+
+TEST(BorderTest, Heavy) {
+  auto element = text("text") | borderHeavy;
+  Screen screen(5, 3);
+  Render(screen, element);
+  EXPECT_EQ(screen.ToString(),
+            "┏━━━┓\r\n"
+            "┃tex┃\r\n"
+            "┗━━━┛");
+}
+
+TEST(BorderTest, Empty) {
+  auto element = text("text") | borderEmpty;
+  Screen screen(5, 3);
+  Render(screen, element);
+  EXPECT_EQ(screen.ToString(),
+            "     \r\n"
+            " tex \r\n"
+            "     ");
+}
+
+TEST(BorderTest, Styled) {
+  auto element = text("text") | borderStyled(DOUBLE);
+  Screen screen(5, 3);
+  Render(screen, element);
+  EXPECT_EQ(screen.ToString(),
+            "╔═══╗\r\n"
+            "║tex║\r\n"
+            "╚═══╝");
+}
+
+TEST(BorderTest, WithPixel) {
+  Pixel pixel;
+  pixel.character = "o";
+  auto element = text("text") | borderWith(pixel);
+  Screen screen(5, 3);
+  Render(screen, element);
+  EXPECT_EQ(screen.ToString(),
+            "ooooo\r\n"
+            "otexo\r\n"
+            "ooooo");
+}
+
+} // namespace ftxui
+
+// Copyright 2022 Arthur Sonzogni. All rights reserved.
+// Use of this source code is governed by the MIT license that can be found in
+// the LICENSE file.