[java-inspections] Test for IDEA-283404 Support Guava's ImmutableSet in 'Overwritten Map, Set, or array element' inspection

PR#1850

GitOrigin-RevId: 0ddfecbae4f28a80c75c87d63331ba3d3bcba7ef

java/java-tests/testData/inspection/overwrittenKey/OverwrittenKey.java

@@ -1,4 +1,5 @@
 import java.util.*;
+import com.google.common.collect.ImmutableSet;
 
 class OverwrittenKey {
   void fillMap(Map<String, Integer> map) {
@@ -59,6 +60,11 @@ class OverwrittenKey {
     System.out.println(xx);
   }
 
+  void guavaImmutableSetOf() {
+    ImmutableSet<Double> s = ImmutableSet.of(<warning descr="Duplicate Set element">-10.</warning>, 1d, <warning descr="Duplicate Set element">-10.0</warning>);
+    System.out.println(s);
+  }
+
   void testParameter(Map<Object, Object> map, String key) {
     map.put(<warning descr="Duplicate Map key">key</warning>, "k1");
     map.put(<warning descr="Duplicate Map key">key</warning>, "k2");

java/java-tests/testSrc/com/intellij/java/codeInspection/OverwrittenKeyInspectionTest.java

@@ -12,6 +12,12 @@ import org.jetbrains.annotations.NotNull;
 
 public class OverwrittenKeyInspectionTest extends LightJavaInspectionTestCase {
   public void testOverwrittenKey() {
+    myFixture.addClass("package com.google.common.collect;\n" +
+                       "public abstract class ImmutableSet<E> implements Set<E> {\n" +
+                       "  public static <E> ImmutableSet<E> of(E... e) {\n" +
+                       "    throw new UnsupportedOperationException();\n" +
+                       "  }\n" +
+                       "}");
     doTest();
   }
   public void testOverwrittenKeyArray() {