initial commit (moved from divan)

src/commonTest/kotlin/assertThrows.kt

@@ -0,0 +1,13 @@
+import kotlin.test.fail
+
+inline fun <reified T: Throwable>assertThrows(f: ()->Unit): T {
+    val name = T::class.simpleName
+    try {
+        f()
+        fail("expected to throw $name but threw nothing")
+    }
+    catch(x: Throwable) {
+        if( x is T ) return x
+        fail("expected to throw $name but instead threw ${x::class.simpleName}: $x")
+    }
+}