Introduce "dummy" Environment implementation

For testing purposes in which an Environment implementation is required
but a ConfigurableEnvironment is not desirable.

All methods are no-ops and return null, therefore NPEs are likely.

spring-core/src/test/java/org/springframework/core/env/DummyEnvironment.java

@@ -0,0 +1,75 @@
+/*
+ * Copyright 2002-2013 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.core.env;
+
+public class DummyEnvironment implements Environment {
+
+	public boolean containsProperty(String key) {
+		return false;
+	}
+
+	public String getProperty(String key) {
+		return null;
+	}
+
+	public String getProperty(String key, String defaultValue) {
+		return null;
+	}
+
+	public <T> T getProperty(String key, Class<T> targetType) {
+		return null;
+	}
+
+	public <T> T getProperty(String key, Class<T> targetType, T defaultValue) {
+		return null;
+	}
+
+	public <T> Class<T> getPropertyAsClass(String key, Class<T> targetType) {
+		return null;
+	}
+
+	public String getRequiredProperty(String key) throws IllegalStateException {
+		return null;
+	}
+
+	public <T> T getRequiredProperty(String key, Class<T> targetType)
+			throws IllegalStateException {
+		return null;
+	}
+
+	public String resolvePlaceholders(String text) {
+		return null;
+	}
+
+	public String resolveRequiredPlaceholders(String text)
+			throws IllegalArgumentException {
+		return null;
+	}
+
+	public String[] getActiveProfiles() {
+		return null;
+	}
+
+	public String[] getDefaultProfiles() {
+		return null;
+	}
+
+	public boolean acceptsProfiles(String... profiles) {
+		return false;
+	}
+
+}