Kotlin: Add a Kotlin 2 copy of the testsuite

java/ql/test-kotlin2/library-tests/java-map-methods/test.kt

@@ -0,0 +1,32 @@
+fun test(m: Map<Int, Int>) = m.getOrDefault(1, 2)
+
+fun test2(s: String) = s.length
+
+fun remove(l: MutableList<Int>) {
+    l.remove(5)
+}
+
+fun fn1(s: String) = s.plus(other = "")
+fun fn2(s: String) = s + ""
+
+fun fn1(i: Int) = i.minus(10)
+fun fn2(i: Int) = i - 10
+
+fun special(n: Number, m: Map<String, String>, s: String, l: MutableList<Int>) {
+    s[1]
+    s.get(1)
+    n.toDouble()
+    n.toByte()
+    n.toChar()
+    n.toFloat()
+    n.toInt()
+    n.toShort()
+    m.keys
+    m.values
+    m.entries
+    l.removeAt(1)
+    m.entries.first().key
+    m.entries.first().value
+}
+
+// Diagnostic Matches: % Couldn't find a Java equivalent function to kotlin.Number.toChar in java.lang.Number %