dfa: suggest to replace variable with int constant (IDEA-111178)

java/java-tests/testData/inspection/dataFlow/fixture/ReportConstantReferences_ReplaceWithIntConstant.java

@@ -0,0 +1,10 @@
+class Test {
+  public static final int CONST = 23942;
+  private void test(int a) {
+    if (a == CONST) {
+      System.out.println(<caret><warning descr="Value 'a' is always 'CONST'">a</warning>);
+    }
+
+  }
+
+}

java/java-tests/testData/inspection/dataFlow/fixture/ReportConstantReferences_ReplaceWithIntConstant_after.java

@@ -0,0 +1,10 @@
+class Test {
+  public static final int CONST = 23942;
+  private void test(int a) {
+    if (a == CONST) {
+      System.out.println(<caret>CONST);
+    }
+
+  }
+
+}

java/java-tests/testData/inspection/dataFlow/fixture/ReportConstantReferences_Switch.java

@@ -6,4 +6,17 @@ class Test {
     }
   }
 
+  private void test2(int state) {
+    switch (state) {
+      case ONE:
+      case TWO:
+        if (state == TWO) {
+          System.out.println("hello");
+        }
+    }
+  }
+
+  public static final int ONE = 1;
+  public static final int TWO = 2;
+
 }