REWRITE COMMIT MSG Suboptimal implementation of Wasm directive test

wasm/wasm.tests/tests/org/jetbrains/kotlin/wasm/test/WasmDirectivesWasmIrTest.kt

diff --git a/wasm/wasm.tests/tests/org/jetbrains/kotlin/wasm/test/WasmDirectivesWasmIrTest.kt b/wasm/wasm.tests/tests/org/jetbrains/kotlin/wasm/test/WasmDirectivesWasmIrTest.kt
new file mode 100644
index 0000000..9733c0b
--- /dev/null
+++ b/wasm/wasm.tests/tests/org/jetbrains/kotlin/wasm/test/WasmDirectivesWasmIrTest.kt
@@ -0,0 +1,58 @@
+/*
+ * Copyright 2010-2025 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.wasm.test
+
+import org.jetbrains.kotlin.test.util.KtTestUtil
+import org.junit.jupiter.api.Test
+import org.junit.jupiter.api.assertThrows
+import java.io.File
+import java.nio.file.Files
+import kotlin.io.path.pathString
+import kotlin.io.path.writeText
+
+// TODO super ugly, find better way to do this (https://jetbrains.slack.com/archives/C0288G57R/p1766139404407909)
+open class TmpDirHelper(protected val tempDir: File) : AbstractFirWasmJsTest(
+    pathToTestDir = tempDir.path,
+    // TODO this is problematic, because it spams that dir once per test invocation. Change this before merging
+    testGroupOutputDirPrefix = "codegen/wasmDirectives"
+)
+
+class WasmDirectivesWasmIrTest : TmpDirHelper(KtTestUtil.tmpDir("wasmDirectivesTest")) {
+    @Test
+    fun testWasmIrDirectivesAreExecuted() {
+
+        val testCodeAndExpectation = mapOf(
+            // Check that directives don't break a trivial test
+            """
+            // WASM_COUNT_INSTRUCTION_IN_SCOPE: instruction=if scope_function=box count=0
+            fun box(): String = "OK"
+            """.trimIndent() to true, // true means expect success
+
+            // Use a directive that is guaranteed to fail if executed properly (expects 1000 ifs in a trivial function)
+            """
+            // WASM_COUNT_INSTRUCTION_IN_SCOPE: instruction=if scope_function=box count=1000
+        
+            fun box(): String {
+                return "OK"
+            }
+            """.trimIndent() to false
+        )
+
+        // Create temporary directory; iterate tests; clean up
+        for ((testCode, expectedSuccess) in testCodeAndExpectation) {
+            val testFile = Files.createTempFile(tempDir.toPath(), "test", ".kt")
+            testFile.writeText(testCode)
+
+            if (expectedSuccess) {
+                runTest(testFile.pathString)
+            } else {
+                assertThrows<AssertionError> { runTest(testFile.pathString) }
+            }
+        }
+
+
+    }
+}
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