DATAGEODE-124 - Relax type matching for resolving Function arguments in FunctionContextInjectingArgumentResolver.

src/test/java/org/springframework/data/gemfire/function/FunctionContextInjectingArgumentResolverUnitTests.java

@@ -0,0 +1,116 @@
+/*
+ * Copyright 2018 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.data.gemfire.function;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.lang.reflect.Method;
+
+import org.apache.geode.cache.execute.FunctionContext;
+import org.apache.geode.cache.execute.RegionFunctionContext;
+import org.junit.Test;
+import org.springframework.data.gemfire.function.annotation.GemfireFunction;
+import org.springframework.data.gemfire.util.ArrayUtils;
+
+/**
+ * Unit tests for {@link FunctionContextInjectingArgumentResolver}.
+ *
+ * @author John Blum
+ * @see java.lang.reflect.Method
+ * @see org.junit.Test
+ * @see org.apache.geode.cache.execute.FunctionContext
+ * @see org.apache.geode.cache.execute.RegionFunctionContext
+ * @see org.springframework.data.gemfire.function.FunctionContextInjectingArgumentResolver
+ * @since 1.0.0
+ */
+@SuppressWarnings("unused")
+public class FunctionContextInjectingArgumentResolverUnitTests {
+
+	@Test
+	public void getArgumentTypePositionWithMethodHavingNoArgumentsReturnsMinusOne() throws Exception {
+
+		Method functionOne = FunctionOne.class.getDeclaredMethod("functionOne");
+
+		FunctionContextInjectingArgumentResolver functionArgumentResolver =
+			new FunctionContextInjectingArgumentResolver(functionOne);
+
+		assertThat(functionArgumentResolver.getArgumentTypePosition(functionOne, FunctionContext.class)).isEqualTo(-1);
+	}
+
+	@Test
+	public void getArgumentTypePositionForExactArgumentTypeReturnsNonNegativeIndex() throws Exception {
+
+		Method functionTwo = FunctionTwo.class
+			.getDeclaredMethod("functionTwo", ArrayUtils.asArray(FunctionContext.class));
+
+		FunctionContextInjectingArgumentResolver functionArgumentResolver =
+			new FunctionContextInjectingArgumentResolver(functionTwo);
+
+		assertThat(functionArgumentResolver.getArgumentTypePosition(functionTwo, FunctionContext.class)).isEqualTo(0);
+	}
+
+	@Test
+	public void getArgumentTypePositionForInexactArgumentTypeReturnsNonNegativeIndex() throws Exception {
+
+		Method functionThree = FunctionThree.class
+			.getDeclaredMethod("functionThree", ArrayUtils.asArray(Object.class, RegionFunctionContext.class));
+
+		FunctionContextInjectingArgumentResolver functionArgumentResolver =
+			new FunctionContextInjectingArgumentResolver(functionThree);
+
+		assertThat(functionArgumentResolver.getArgumentTypePosition(functionThree, FunctionContext.class)).isEqualTo(1);
+	}
+
+	@Test
+	public void getArgumentTypePositionForNonMatchingArgumentTypeReturnsMinusOne() throws Exception {
+
+		Method functionFour = FunctionFour.class
+			.getDeclaredMethod("functionFour", ArrayUtils.asArray(Object.class, String.class));
+
+		FunctionContextInjectingArgumentResolver functionArgumentResolver =
+			new FunctionContextInjectingArgumentResolver(functionFour);
+
+		assertThat(functionArgumentResolver.getArgumentTypePosition(functionFour, FunctionContext.class)).isEqualTo(-1);
+	}
+
+	static class FunctionOne {
+
+		@GemfireFunction
+		void functionOne() { }
+
+	}
+
+	static class FunctionTwo {
+
+		@GemfireFunction
+		void functionTwo(FunctionContext functionContext) { }
+
+	}
+
+	static class FunctionThree {
+
+		@GemfireFunction
+		void functionThree(Object arg, RegionFunctionContext functionContext) { }
+	}
+
+	static class FunctionFour {
+
+		@GemfireFunction
+		void functionFour(Object functionContext, String arg) { }
+
+	}
+}