From 5a08861fcb8c5bc5831a6b99c192aba0a7933952 Mon Sep 17 00:00:00 2001 From: Tavian Barnes Date: Sat, 4 Oct 2014 11:46:20 -0400 Subject: test: New sangria-test project. --- .../com/tavianator/sangria/test/AtomicMatcher.java | 38 ++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 sangria-test/src/main/java/com/tavianator/sangria/test/AtomicMatcher.java (limited to 'sangria-test/src/main/java/com/tavianator/sangria/test/AtomicMatcher.java') 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 { + @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"); + } +} -- cgit v1.2.3