initial commit

src/test/kotlin/dev/hgh/HarnessSmokeTest.kt

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+package dev.hgh
+
+import com.intellij.testFramework.fixtures.BasePlatformTestCase
+
+/**
+ * Validates that the headless test harness works end to end:
+ * a JDK is resolved, the IntelliJ Platform boots, and a fixture can be driven
+ * without launching an IDE.
+ *
+ * If this fails, no other test in the project can be trusted.
+ */
+class HarnessSmokeTest : BasePlatformTestCase() {
+
+    fun testPlatformBootsHeadlessly() {
+        val file = myFixture.configureByText("smoke.txt", "hello jai")
+        assertNotNull("fixture should create a PsiFile", file)
+        assertEquals("hello jai", file.text)
+    }
+
+    fun testRunningOnJava21OrLater() {
+        val major = Runtime.version().feature()
+        assertTrue(
+            "IntelliJ Platform test-framework is Java 21 bytecode; running on $major",
+            major >= 21,
+        )
+    }
+}