Rewrite precondition samples and refactor precondition tests

Precondition tests are shared for JS target.
Samples do not use assertFailsWith as expression, as it's going to be converted as a special template.

libraries/stdlib/test/utils/PreconditionsTest.kt

@@ -0,0 +1,127 @@
+package test.utils
+
+import org.junit.Test
+import kotlin.test.*
+
+class PreconditionsTest() {
+
+    @Test fun passingRequire() {
+        require(true)
+
+        var called = false
+        require(true) { called = true; "some message" }
+        assertFalse(called)
+    }
+
+    @Test fun failingRequire() {
+        val error = assertFailsWith<IllegalArgumentException> {
+            require(false)
+        }
+        assertNotNull(error.message)
+    }
+
+    @Test fun failingRequireWithLazyMessage() {
+        val error = assertFailsWith<IllegalArgumentException> {
+            require(false) { "Hello" }
+        }
+        assertEquals("Hello", error.message)
+    }
+
+    @Test fun passingCheck() {
+        check(true)
+
+        var called = false
+        check(true) { called = true; "some message" }
+        assertFalse(called)
+    }
+
+    @Test fun failingCheck() {
+        val error = assertFailsWith<IllegalStateException> {
+            check(false)
+        }
+        assertNotNull(error.message)
+    }
+
+    @Test fun failingCheckWithLazyMessage() {
+        val error = assertFailsWith<IllegalStateException> {
+            check(false) { "Hello" }
+        }
+        assertEquals("Hello", error.message)
+    }
+
+    @Test fun requireNotNull() {
+        val s1: String? = "S1"
+        val r1: String = requireNotNull(s1)
+        assertEquals("S1", r1)
+    }
+
+    @Test fun requireNotNullFails() {
+        assertFailsWith<IllegalArgumentException> {
+            val s2: String? = null
+            requireNotNull(s2)
+        }
+    }
+
+    @Test fun requireNotNullWithLazyMessage() {
+        val error = assertFailsWith<IllegalArgumentException> {
+            val obj: Any? = null
+            requireNotNull(obj) { "Message" }
+        }
+        assertEquals("Message", error.message)
+
+        var lazyCalled: Boolean = false
+        requireNotNull("not null") {
+            lazyCalled = true
+            "Message"
+        }
+        assertFalse(lazyCalled, "Message is not evaluated if the condition is met")
+    }
+
+    @Test fun checkNotNull() {
+        val s1: String? = "S1"
+        val r1: String = checkNotNull(s1)
+        assertEquals("S1", r1)
+    }
+
+    @Test fun checkNotNullFails() {
+        assertFailsWith<IllegalStateException> {
+            val s2: String? = null
+            checkNotNull(s2)
+        }
+    }
+
+    @kotlin.jvm.JvmVersion
+    @Test fun passingAssert() {
+        assert(true)
+        var called = false
+        assert(true) { called = true; "some message" }
+
+        assertFalse(called)
+    }
+
+
+    @kotlin.jvm.JvmVersion
+    @Test fun failingAssert() {
+        val error = assertFailsWith<AssertionError> {
+            assert(false)
+        }
+        assertEquals("Assertion failed", error.message)
+    }
+
+
+    @kotlin.jvm.JvmVersion
+    @Test fun failingAssertWithMessage() {
+        val error = assertFailsWith<AssertionError> {
+            assert(false) { "Hello" }
+        }
+        assertEquals("Hello", error.message)
+    }
+
+    @Test fun error() {
+        val error = assertFailsWith<IllegalStateException> {
+            error("There was a problem")
+        }
+        assertEquals("There was a problem", error.message)
+    }
+
+}