test: New sangria-test project.

5 files changed, 227 insertions, 0 deletions

diff --git a/sangria-test/src/main/java/com/tavianator/sangria/test/AtomicMatcher.java b/sangria-test/src/main/java/com/tavianator/sangria/test/AtomicMatcher.java
new file mode 100644
index 0000000..03c897e
--- /dev/null
+++ b/sangria-test/src/main/java/com/tavianator/sangria/test/AtomicMatcher.java
@@ -0,0 +1,38 @@
+package com.tavianator.sangria.test;
+
+import com.google.inject.CreationException;
+import com.google.inject.Guice;
+import com.google.inject.Module;
+import com.google.inject.spi.Elements;
+import org.hamcrest.Description;
+import org.hamcrest.TypeSafeDiagnosingMatcher;
+
+/**
+ * Matcher that checks whether a {@link Module} can be installed multiple times.
+ *
+ * @author Tavian Barnes (tavianator@tavianator.com)
+ * @version 1.2
+ * @since 1.2
+ */
+final class AtomicMatcher extends TypeSafeDiagnosingMatcher<Module> {
+    @Override
+    protected boolean matchesSafely(Module item, Description mismatchDescription) {
+        // Pass through the SPI to make sure the Module is atomic regardless of its equals() implementation
+        // This ensures atomicity even through Modules.override(), for example
+        Module copy1 = Elements.getModule(Elements.getElements(item));
+        Module copy2 = Elements.getModule(Elements.getElements(item));
+
+        try {
+            Guice.createInjector(copy1, copy2);
+            return true;
+        } catch (CreationException e) {
+            mismatchDescription.appendValue(e);
+            return false;
+        }
+    }
+
+    @Override
+    public void describeTo(Description description) {
+        description.appendText("an atomic Module");
+    }
+}
diff --git a/sangria-test/src/main/java/com/tavianator/sangria/test/BestPracticesMatcher.java b/sangria-test/src/main/java/com/tavianator/sangria/test/BestPracticesMatcher.java
new file mode 100644
index 0000000..36eea97
--- /dev/null
+++ b/sangria-test/src/main/java/com/tavianator/sangria/test/BestPracticesMatcher.java
@@ -0,0 +1,42 @@
+package com.tavianator.sangria.test;
+
+import com.google.inject.AbstractModule;
+import com.google.inject.CreationException;
+import com.google.inject.Guice;
+import com.google.inject.Module;
+import org.hamcrest.Description;
+import org.hamcrest.TypeSafeDiagnosingMatcher;
+
+/**
+ * Matcher that checks whether a {@link Module} follows Guice best practices.
+ *
+ * @author Tavian Barnes (tavianator@tavianator.com)
+ * @version 1.2
+ * @since 1.2
+ */
+final class BestPracticesMatcher extends TypeSafeDiagnosingMatcher<Module> {
+    private static final class EnforcerModule extends AbstractModule {
+        @Override
+        protected void configure() {
+            binder().requireAtInjectOnConstructors();
+            binder().requireExactBindingAnnotations();
+            binder().requireExplicitBindings();
+        }
+    }
+
+    @Override
+    protected boolean matchesSafely(Module item, Description mismatchDescription) {
+        try {
+            Guice.createInjector(item, new EnforcerModule());
+            return true;
+        } catch (CreationException e) {
+            mismatchDescription.appendValue(e);
+            return false;
+        }
+    }
+
+    @Override
+    public void describeTo(Description description) {
+        description.appendText("a Module following Guice best practices");
+    }
+}
diff --git a/sangria-test/src/main/java/com/tavianator/sangria/test/SangriaMatchers.java b/sangria-test/src/main/java/com/tavianator/sangria/test/SangriaMatchers.java
new file mode 100644
index 0000000..da8dd74
--- /dev/null
+++ b/sangria-test/src/main/java/com/tavianator/sangria/test/SangriaMatchers.java
@@ -0,0 +1,31 @@
+package com.tavianator.sangria.test;
+
+import com.google.inject.Module;
+import org.hamcrest.Matcher;
+
+/**
+ * Guice-related Hamcrest matchers.
+ *
+ * @author Tavian Barnes (tavianator@tavianator.com)
+ * @version 1.2
+ * @since 1.2
+ */
+public final class SangriaMatchers {
+    private SangriaMatchers() {
+        // Not for instantiating
+    }
+
+    /**
+     * @return A {@link Matcher} that checks whether a {@link Module}'s bindings can be de-duplicated successfully.
+     */
+    public static Matcher<Module> atomic() {
+        return new AtomicMatcher();
+    }
+
+    /**
+     * @return A {@link Matcher} that checks whether a {@link Module} follows Guice best practices.
+     */
+    public static Matcher<Module> followsBestPractices() {
+        return new BestPracticesMatcher();
+    }
+}
diff --git a/sangria-test/src/main/java/com/tavianator/sangria/test/package-info.java b/sangria-test/src/main/java/com/tavianator/sangria/test/package-info.java
new file mode 100644
index 0000000..0375640
--- /dev/null
+++ b/sangria-test/src/main/java/com/tavianator/sangria/test/package-info.java
@@ -0,0 +1,25 @@
+/****************************************************************************
+ * Sangria                                                                  *
+ * Copyright (C) 2014 Tavian Barnes <tavianator@tavianator.com>             *
+ *                                                                          *
+ * 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.                                           *
+ ****************************************************************************/
+
+/**
+ * {@code sangria-test}: Utilities for testing with Guice.
+ *
+ * @author Tavian Barnes (tavianator@tavianator.com)
+ * @version 1.2
+ * @since 1.2
+ */
+package com.tavianator.sangria.test;
diff --git a/sangria-test/src/test/java/com/tavianator/sangria/test/SangriaMatchersTest.java b/sangria-test/src/test/java/com/tavianator/sangria/test/SangriaMatchersTest.java
new file mode 100644
index 0000000..06fb45e
--- /dev/null
+++ b/sangria-test/src/test/java/com/tavianator/sangria/test/SangriaMatchersTest.java
@@ -0,0 +1,91 @@
+package com.tavianator.sangria.test;
+
+import javax.inject.Inject;
+import javax.inject.Named;
+
+import com.google.inject.AbstractModule;
+import com.google.inject.Provides;
+import org.junit.Test;
+
+import static com.tavianator.sangria.test.SangriaMatchers.*;
+import static org.hamcrest.Matchers.*;
+import static org.junit.Assert.*;
+
+/**
+ * Tests for {@link SangriaMatchers}.
+ *
+ * @author Tavian Barnes (tavianator@tavianator.com)
+ * @version 1.2
+ * @since 1.2
+ */
+public class SangriaMatchersTest {
+    private static class AtomicModule extends AbstractModule {
+        private static final Object INSTANCE = new Object();
+
+        @Override
+        protected void configure() {
+            bind(Object.class)
+                    .toInstance(INSTANCE);
+        }
+    }
+
+    private static class NonAtomicModule extends AbstractModule {
+        @Override
+        protected void configure() {
+            bind(Object.class)
+                    .toInstance(new Object());
+        }
+    }
+
+    @Test
+    public void testAtomic() {
+        assertThat(new AtomicModule(), is(atomic()));
+        assertThat(new NonAtomicModule(), is(not(atomic())));
+    }
+
+    private static class NoAtInjectModule extends AbstractModule {
+        @Override
+        protected void configure() {
+            bind(String.class);
+        }
+    }
+
+    private static class InexactBindingAnnotationModule extends AbstractModule {
+        @Override
+        protected void configure() {
+            bind(String.class)
+                    .annotatedWith(Named.class)
+                    .toInstance("test");
+        }
+
+        @Provides
+        String getString(@Named("test") String test) {
+            return test;
+        }
+    }
+
+    private static class Injectable {
+        @Inject
+        Injectable() {
+        }
+    }
+
+    private static class JustInTimeModule extends AbstractModule {
+        @Override
+        protected void configure() {
+        }
+
+        @Provides
+        String getString(Injectable injectable) {
+            return "test";
+        }
+    }
+
+    @Test
+    public void testFollowsBestPractices() {
+        assertThat(new AtomicModule(), followsBestPractices());
+        assertThat(new NoAtInjectModule(), not(followsBestPractices()));
+        assertThat(new InexactBindingAnnotationModule(), not(followsBestPractices()));
+        assertThat(new JustInTimeModule(), not(followsBestPractices()));
+    }
+}