feat: Add a pipeline and some basic tests

.drone.yml

@@ -0,0 +1,27 @@
+---
+kind: pipeline
+type: docker
+name: default
+
+steps:
+- name: "Build"
+  image: "eclipse-temurin:16-jdk"
+  commands:
+    - "./gradlew assemble"
+- name: "Test"
+  image: "eclipse-temurin:16-jdk"
+  commands:
+    - "./gradlew test"
+- name: "Create Release"
+  image: plugins/gitea-release
+  settings:
+    api_key:
+      from_secret: "gitea_api_key"
+    base_url:
+      from_secret: "gitea_base_url"
+    files: build/libs/CSharpCommentChecker-*.jar
+  when:
+    branch:
+    - master
+
+

src/test/kotlin/MainKtTest.kt

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+import org.junit.jupiter.api.Assertions.*
+import org.junit.jupiter.api.Test
+
+internal class MainKtTest {
+
+    @Test
+    fun `groupCommentLines groups two adjacent lines`() {
+        val lines = listOf(1, 2)
+
+        assertEquals(listOf(listOf(1, 2)), groupCommentLines(lines))
+    }
+
+    @Test
+    fun `groupCommentLines doesn't group two non adjacent lines`() {
+        val lines = listOf(1, 3)
+
+        assertEquals(listOf(listOf(1), listOf(3)), groupCommentLines(lines))
+    }
+
+    @Test
+    fun `groupCommentLines groups larger groups`() {
+        val lines = listOf(1, 2, 3, 4, 5)
+
+        assertEquals(listOf(listOf(1, 2, 3, 4, 5)), groupCommentLines(lines))
+    }
+
+    @Test
+    fun `groupCommentLines groups multiple groups`() {
+        val lines = listOf(1, 2, 3, 5, 6, 7)
+
+        assertEquals(listOf(listOf(1, 2, 3), listOf(5, 6, 7)), groupCommentLines(lines))
+    }
+
+    @Test
+    fun `groupCommentLines without any comments`() {
+        val lines = emptyList<Int>()
+
+        assertEquals(emptyList<List<Int>>(), groupCommentLines(lines))
+    }
+}