Merge "Add utils for forgetting curve" into jb-dev

1 files changed, 56 insertions, 0 deletions

diff --git a/tests/src/com/android/inputmethod/latin/ForgettingCurveTests.java b/tests/src/com/android/inputmethod/latin/ForgettingCurveTests.java
new file mode 100644
index 000000000..a2e71c11a
--- /dev/null
+++ b/tests/src/com/android/inputmethod/latin/ForgettingCurveTests.java
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * 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.
+ */
+
+package com.android.inputmethod.latin;
+
+import android.test.AndroidTestCase;
+
+public class ForgettingCurveTests extends AndroidTestCase {
+    public void testFcToFreq() {
+        for (int i = 0; i < Byte.MAX_VALUE; ++i) {
+            final byte fc = (byte)i;
+            final int e = UserHistoryForgettingCurveUtils.fcToElapsedTime(fc);
+            final int c = UserHistoryForgettingCurveUtils.fcToCount(fc);
+            final int l = UserHistoryForgettingCurveUtils.fcToLevel(fc);
+            final byte fc2 = UserHistoryForgettingCurveUtils.calcFc(e, c, l);
+            assertEquals(fc, fc2);
+        }
+        byte fc = 0;
+        int l;
+        for (int i = 0; i < 4; ++i) {
+            for (int j = 0; j < (UserHistoryForgettingCurveUtils.COUNT_MAX + 1); ++j) {
+                fc = UserHistoryForgettingCurveUtils.pushCount(fc, true);
+            }
+            l = UserHistoryForgettingCurveUtils.fcToLevel(fc);
+            assertEquals(l, Math.max(1, Math.min(i + 1, 3)));
+        }
+        fc = 0;
+        for (int i = 0; i < 4; ++i) {
+            for (int j = 0; j < (UserHistoryForgettingCurveUtils.COUNT_MAX + 1); ++j) {
+                fc = UserHistoryForgettingCurveUtils.pushCount(fc, false);
+            }
+            l = UserHistoryForgettingCurveUtils.fcToLevel(fc);
+            assertEquals(l, Math.min(i + 1, 3));
+        }
+        for (int i = 0; i < 4; ++i) {
+            for (int j = 0; j < (UserHistoryForgettingCurveUtils.ELAPSED_TIME_MAX + 1); ++j) {
+                fc = UserHistoryForgettingCurveUtils.pushElapsedTime(fc);
+            }
+            l = UserHistoryForgettingCurveUtils.fcToLevel(fc);
+            assertEquals(l, Math.max(0, 2 - i));
+        }
+    }
+}