Bug 1318222 - Add a unit test r=sebastian

MozReview-Commit-ID: Fv1e2dtPKut

--HG--
extra : rebase_source : d410228beecea6c6389f1980f849738745d81631

mobile/android/tests/background/junit4/src/org/mozilla/gecko/util/TestFloatUtils.java

@@ -0,0 +1,68 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+package org.mozilla.gecko.util;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mozilla.gecko.background.testhelpers.TestRunner;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+
+
+/**
+ * Unit tests for float utilities.
+ */
+@RunWith(TestRunner.class)
+public class TestFloatUtils {
+    @Test
+    public void testZeros() {
+        assertTrue(FloatUtils.fuzzyEquals(0, 0));
+    }
+
+    @Test
+    public void testNotEqual() {
+        assertFalse(FloatUtils.fuzzyEquals(10, 0));
+    }
+
+    @Test
+    public void testEqualsPromoted() {
+        assertTrue(FloatUtils.fuzzyEquals(5, 5));
+    }
+
+    @Test
+    public void testEqualsUnPromoted() {
+        assertTrue(FloatUtils.fuzzyEquals(5.6f, 5.6f));
+    }
+
+    @Test
+    public void testClampSuccess() {
+        assertTrue(3 == FloatUtils.clamp(3, 1, 5));
+    }
+
+    @Test
+    public void testClampFail() {
+        try {
+            FloatUtils.clamp(3, 5, 1);
+        } catch (IllegalArgumentException e) {
+            assertNotNull(e);
+        }
+    }
+
+    @Test
+    public void testInterpolateSuccess() {
+        assertTrue(4 == FloatUtils.interpolate(1, 2, 3));
+    }
+
+    @Test
+    public void testInterpolateFail() {
+        assertFalse(3 == FloatUtils.interpolate(1, 2, 3));
+    }
+
+
+}