Changed return value of ParameterResolver::resolve to use a ValueResult that contains metadata about the value that was resolved

Added new ValueResultAsserts to facilitate testing of ParameterResolvers

spring-shell2-core-tests/pom.xml

@@ -0,0 +1,27 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+		 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+
+	<artifactId>spring-shell2-core-tests</artifactId>
+	<packaging>jar</packaging>
+
+	<parent>
+		<groupId>org.springframework.shell</groupId>
+		<artifactId>spring-shell2-parent</artifactId>
+		<version>2.0.0.BUILD-SNAPSHOT</version>
+	</parent>
+	
+	<description>Core API test classes for Spring Shell 2</description>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.shell</groupId>
+			<artifactId>spring-shell2-core</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.assertj</groupId>
+			<artifactId>assertj-core</artifactId>
+			<scope>compile</scope>
+		</dependency>
+	</dependencies>
+</project>

spring-shell2-core-tests/src/main/java/org/springframework/shell2/ValueResultAsserts.java

@@ -0,0 +1,69 @@
+/*
+ * Copyright 2017 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.shell2;
+
+import org.assertj.core.api.AbstractAssert;
+import org.assertj.core.api.Assertions;
+
+/**
+ * Assertions for {@link ValueResult}.
+ * 
+ * @author Camilo Gonzalez
+ */
+public class ValueResultAsserts extends AbstractAssert<ValueResultAsserts, ValueResult> {
+
+	public ValueResultAsserts(ValueResult actual) {
+		super(actual, ValueResultAsserts.class);
+	}
+
+	public ValueResultAsserts hasValue(Object expectedValue) {
+		isNotNull();
+		Assertions.assertThat(actual.resolvedValue()).isEqualTo(expectedValue);
+		return this;
+	}
+
+	public ValueResultAsserts usesWords(int... expectedWordsUsed) {
+		isNotNull();
+
+		Assertions.assertThat(actual.wordsUsed().stream().toArray()).containsExactly(expectedWordsUsed);
+
+		return this;
+	}
+
+	public ValueResultAsserts notUsesWords() {
+		isNotNull();
+		Assertions.assertThat(actual.wordsUsed().isEmpty());
+		return this;
+	}
+
+	public ValueResultAsserts usesWordsForValue(int... expectedWordsUsedForValue) {
+		isNotNull();
+
+		Assertions.assertThat(actual.wordsUsedForValue().stream().toArray()).containsExactly(expectedWordsUsedForValue);
+
+		return this;
+	}
+
+	public ValueResultAsserts notUsesWordsForValue() {
+		isNotNull();
+		Assertions.assertThat(actual.wordsUsedForValue().isEmpty());
+		return this;
+	}
+
+	public static ValueResultAsserts assertThat(ValueResult valueResult) {
+		return new ValueResultAsserts(valueResult);
+	}
+}