Add integration test for multiple extensions

commonmark-integration-test/src/test/java/org/commonmark/integration/MarkdownRendererIntegrationTest.java

+package org.commonmark.integration;
+
+import org.commonmark.Extension;
+import org.commonmark.ext.autolink.AutolinkExtension;
+import org.commonmark.ext.front.matter.YamlFrontMatterExtension;
+import org.commonmark.ext.gfm.strikethrough.StrikethroughExtension;
+import org.commonmark.ext.gfm.tables.TablesExtension;
+import org.commonmark.ext.image.attributes.ImageAttributesExtension;
+import org.commonmark.ext.ins.InsExtension;
+import org.commonmark.ext.task.list.items.TaskListItemsExtension;
+import org.commonmark.parser.Parser;
+import org.commonmark.renderer.markdown.MarkdownRenderer;
+import org.junit.Test;
+
+import java.util.Arrays;
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+
+public class MarkdownRendererIntegrationTest {
+
+    private static final List<Extension> EXTENSIONS = Arrays.asList(
+            AutolinkExtension.create(),
+            ImageAttributesExtension.create(),
+            InsExtension.create(),
+            StrikethroughExtension.create(),
+            TablesExtension.create(),
+            TaskListItemsExtension.create(),
+            YamlFrontMatterExtension.create());
+    private static final Parser PARSER = Parser.builder().extensions(EXTENSIONS).build();
+    private static final MarkdownRenderer RENDERER = MarkdownRenderer.builder().extensions(EXTENSIONS).build();
+
+    @Test
+    public void testStrikethroughInTable() {
+        assertRoundTrip("|Abc|\n|---|\n|~strikethrough~|\n|\\~escaped\\~|\n");
+    }
+
+    private String render(String source) {
+        return RENDERER.render(PARSER.parse(source));
+    }
+
+    private void assertRoundTrip(String input) {
+        String rendered = render(input);
+        assertEquals(input, rendered);
+    }
+}