1 files changed, 42 insertions, 0 deletions
diff --git a/hamcrest-core/src/test/java/org/hamcrest/core/IsNotTest.java b/hamcrest-core/src/test/java/org/hamcrest/core/IsNotTest.java
new file mode 100644
index 0000000..79f4683
--- /dev/null
+++ b/hamcrest-core/src/test/java/org/hamcrest/core/IsNotTest.java
@@ -0,0 +1,42 @@
+package org.hamcrest.core;
+
+import org.hamcrest.Matcher;
+import org.junit.Test;
+
+import static org.hamcrest.AbstractMatcherTest.*;
+import static org.hamcrest.core.IsEqual.equalTo;
+import static org.hamcrest.core.IsInstanceOf.instanceOf;
+import static org.hamcrest.core.IsNot.not;
+
+public final class IsNotTest {
+
+    @Test public void
+    copesWithNullsAndUnknownTypes() {
+        Matcher<String> matcher = not("something");
+
+        assertNullSafe(matcher);
+        assertUnknownTypeSafe(matcher);
+    }
+
+    @Test public void
+    evaluatesToTheTheLogicalNegationOfAnotherMatcher() {
+        final Matcher<String> matcher = not(equalTo("A"));
+
+        assertMatches(matcher, "B");
+        assertDoesNotMatch(matcher, "A");
+    }
+
+    @Test public void
+    providesConvenientShortcutForNotEqualTo() {
+        final Matcher<String> matcher = not("A");
+
+        assertMatches(matcher, "B");
+        assertDoesNotMatch(matcher, "A");
+    }
+
+    @Test public void
+    usesDescriptionOfNegatedMatcherWithPrefix() {
+        assertDescription("not an instance of java.lang.String", not(instanceOf(String.class)));
+        assertDescription("not \"A\"", not("A"));
+    }
+}