Test links definitions in license/README.md

repo/codebase-tests/tests/org/jetbrains/kotlin/code/LicensesTests.kt

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.code
+
+import junit.framework.TestCase
+import org.jetbrains.kotlin.test.testFramework.KtUsefulTestCase
+import org.junit.Test
+import java.io.File
+
+class LicensesTests {
+    @Test
+    fun testLinksDefinitions() {
+        val licenseDir = File("license")
+
+        val linkDefinitionRegExp = Regex(pattern = "\\[(\\w+)]:.+")
+        val linkRegExp = Regex(pattern = "]\\s?\\[(\\w+)]")
+
+        val linksUsages = mutableSetOf<String>()
+        val linksDefinitions = mutableSetOf<String>()
+
+        val readmeFile = File(licenseDir, "README.md")
+        readmeFile.useLines { lineSequence ->
+            lineSequence.forEach { line ->
+                val definitionMatch = linkDefinitionRegExp.matchEntire(line)
+                if (definitionMatch != null) {
+                    linksDefinitions.add(definitionMatch.groups[1]?.value ?: error("Should be present because of match"))
+                } else {
+                    linksUsages.addAll(linkRegExp.findAll(line).map { it.groups[1]?.value ?: "Should be present because of match" })
+                }
+            }
+        }
+
+        KtUsefulTestCase.assertOrderedEquals(
+            "Incorrect links definitions usage in $readmeFile. Expected - links definitions. Actual - links usages",
+            linksUsages.sorted(),
+            linksDefinitions.sorted()
+        )
+    }
+}