Issue 999: NPE from CompileTimeConstantAnalyzer

compiler/javatests/com/google/dart/compiler/common/ErrorExpectation.java

Index: compiler/javatests/com/google/dart/compiler/common/ErrorExpectation.java
diff --git a/compiler/javatests/com/google/dart/compiler/common/ErrorExpectation.java b/compiler/javatests/com/google/dart/compiler/common/ErrorExpectation.java
new file mode 100644
index 0000000000000000000000000000000000000000..0bce419c4ea3c9422b915edc4d88756aad64a29b
--- /dev/null
+++ b/compiler/javatests/com/google/dart/compiler/common/ErrorExpectation.java
@@ -0,0 +1,72 @@
+// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+package com.google.dart.compiler.common;
+
+import com.google.dart.compiler.DartCompilationError;
+import com.google.dart.compiler.ErrorCode;
+
+import junit.framework.Assert;
+
+import java.util.List;
+
+public class ErrorExpectation {
+  final ErrorCode errorCode;
+  final int line;
+  final int column;
+  final int length;
+
+  public ErrorExpectation(ErrorCode errorCode, int line, int column, int length) {
+    this.errorCode = errorCode;
+    this.line = line;
+    this.column = column;
+    this.length = length;
+  }
+
+  public static ErrorExpectation errEx(ErrorCode errorCode, int line, int column, int length) {
+    return new ErrorExpectation(errorCode, line, column,  length);
+  }
+
+  /**
+   * Asserts that given list of {@link DartCompilationError} is exactly same as expected.
+   */
+  public static void assertErrors(List<DartCompilationError> errors,
+      ErrorExpectation... expectedErrors) {
+    StringBuffer errorMessage = new StringBuffer();
+    // count of errors
+    if (errors.size() != expectedErrors.length) {
+      String out = String.format(
+          "Expected %s errors, but got %s: %s",
+          expectedErrors.length,
+          errors.size(),
+          errors);
+      errorMessage.append(out + "\n");
+    }
+    // content of errors
+    for (int i = 0; i < expectedErrors.length; i++) {
+      ErrorExpectation expectedError = expectedErrors[i];
+      DartCompilationError actualError = errors.get(i);
+      if (actualError.getErrorCode() != expectedError.errorCode
+          || actualError.getLineNumber() != expectedError.line
+          || actualError.getColumnNumber() != expectedError.column
+          || actualError.getLength() != expectedError.length) {
+        String out = String.format( 
+            "Expected %s:%d:%d/%d, but got %s:%d:%d/%d",
+            expectedError.errorCode,
+            expectedError.line,
+            expectedError.column,
+            expectedError.length,
+            actualError.getErrorCode(),
+            actualError.getLineNumber(),
+            actualError.getColumnNumber(),
+            actualError.getLength());
+        errorMessage.append(out + "\n");
+      }
+    }
+    if (errorMessage.length() > 0) {
+      System.err.println(errorMessage);
+      Assert.fail(errorMessage.toString());
+    }
+  }
+}