Add a unit test to verify the getSingleInput fix

The test passes, but fails if the previous commit is reverted.

Author: ctrueden

src/test/java/org/scijava/module/ModuleServiceTest.java

@@ -0,0 +1,151 @@
+/*
+ * #%L
+ * SciJava Common shared library for SciJava software.
+ * %%
+ * Copyright (C) 2009 - 2014 Board of Regents of the University of
+ * Wisconsin-Madison, Broad Institute of MIT and Harvard, and Max Planck
+ * Institute of Molecular Cell Biology and Genetics.
+ * %%
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ * #L%
+ */
+
+package org.scijava.module;
+
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertSame;
+
+import org.junit.Test;
+import org.scijava.Context;
+
+/**
+ * Tests {@link ModuleService}.
+ * 
+ * @author Curtis Rueden
+ */
+public class ModuleServiceTest {
+
+	@Test
+	public void testGetSingleInput() throws ModuleException {
+		final Context context = new Context(ModuleService.class);
+		final ModuleService moduleService = context.getService(ModuleService.class);
+
+		final ModuleInfo info = new FooModuleInfo();
+		final Module module = info.createModule();
+
+		// verify single string input is detected
+		final ModuleItem<String> singleString =
+			moduleService.getSingleInput(module, String.class);
+		assertSame(info.getInput("string"), singleString);
+
+		// check that non-autofilled inputs are not detected
+		final ModuleItem<Float> singleFloat =
+			moduleService.getSingleInput(module, Float.class);
+		assertNull(singleFloat);
+
+		// verify that multiple inputs of the same type are not detected
+		final ModuleItem<Integer> singleInteger =
+			moduleService.getSingleInput(module, Integer.class);
+		assertNull(singleInteger);
+
+		// verify that single input is detected if there are
+		// non-autofilled inputs of the same kind too
+		final ModuleItem<Double> singleDouble =
+			moduleService.getSingleInput(module, Double.class);
+		assertSame(info.getInput("double2"), singleDouble);
+	}
+
+	/** A sample module for testing the module service. */
+	public static class FooModule extends AbstractModule {
+
+		private final FooModuleInfo info;
+
+		public FooModule(final FooModuleInfo info) {
+			this.info = info;
+		}
+
+		@Override
+		public ModuleInfo getInfo() {
+			return info;
+		}
+
+		@Override
+		public void run() {
+			// TODO Auto-generated method stub
+		}
+
+	}
+
+	/** {@link ModuleInfo} implementation for the {@link FooModule}. */
+	public static class FooModuleInfo extends AbstractModuleInfo {
+
+		@Override
+		public String getDelegateClassName() {
+			return FooModule.class.getName();
+		}
+
+		@Override
+		public Class<?> loadDelegateClass() throws ClassNotFoundException {
+			return FooModule.class;
+		}
+
+		@Override
+		public Module createModule() throws ModuleException {
+			return new FooModule(this);
+		}
+
+		@Override
+		protected void parseParameters() {
+			addInput("string", String.class, true);
+			addInput("float", Float.class, false);
+			addInput("integer1", Integer.class, true);
+			addInput("integer2", Integer.class, true);
+			addInput("double1", Double.class, false);
+			addInput("double2", Double.class, true);
+		}
+
+		private <T> void addInput(final String name, final Class<T> type,
+			final boolean autoFill)
+		{
+			registerInput(new AbstractModuleItem<T>(this) {
+
+				@Override
+				public String getName() {
+					return name;
+				}
+
+				@Override
+				public Class<T> getType() {
+					return type;
+				}
+
+				@Override
+				public boolean isAutoFill() {
+					return autoFill;
+				}
+
+			});
+		}
+
+	}
+
+}