Stream API migration: add narrowing cast if necessary when replacing += with sum()

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/streamApiMigration/afterSumNarrowing.java

@@ -0,0 +1,9 @@
+// "Replace with sum()" "true"
+
+import java.util.Arrays;
+
+public class Main {
+  public void test(long[] list) {
+      int sum = Arrays.stream(list).mapToInt(x -> (int) x).sum();
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/streamApiMigration/afterSumNarrowingParens.java

@@ -0,0 +1,9 @@
+// "Replace with sum()" "true"
+
+import java.util.Arrays;
+
+public class Main {
+  public void test(double[] list) {
+      int sum = Arrays.stream(list).mapToInt(x -> (int) (x * x)).sum();
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/streamApiMigration/beforeSumNarrowing.java

@@ -0,0 +1,10 @@
+// "Replace with sum()" "true"
+
+public class Main {
+  public void test(long[] list) {
+    int sum = 0;
+    for(long x : li<caret>st) {
+      sum+=x;
+    }
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/streamApiMigration/beforeSumNarrowingParens.java

@@ -0,0 +1,10 @@
+// "Replace with sum()" "true"
+
+public class Main {
+  public void test(double[] list) {
+    int sum = 0;
+    for(double x : li<caret>st) {
+      sum+=x * x;
+    }
+  }
+}