Rename PrevWordsInfo to NgramContext.

Bug: 14425059
Change-Id: Id06a71681fa8b5e589e29fba10fe5c1cfed66984

1 files changed, 66 insertions, 0 deletions

diff --git a/tests/src/com/android/inputmethod/latin/NgramContextTests.java b/tests/src/com/android/inputmethod/latin/NgramContextTests.java
new file mode 100644
index 000000000..ecc2c634d
--- /dev/null
+++ b/tests/src/com/android/inputmethod/latin/NgramContextTests.java
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2014 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 com.android.inputmethod.latin.NgramContext.WordInfo;
+
+import android.test.AndroidTestCase;
+import android.test.suitebuilder.annotation.SmallTest;
+
+@SmallTest
+public class NgramContextTests extends AndroidTestCase {
+    public void testConstruct() {
+        assertEquals(new NgramContext(new WordInfo("a")), new NgramContext(new WordInfo("a")));
+        assertEquals(new NgramContext(WordInfo.BEGINNING_OF_SENTENCE),
+                new NgramContext(WordInfo.BEGINNING_OF_SENTENCE));
+        assertEquals(new NgramContext(WordInfo.EMPTY_WORD_INFO),
+                new NgramContext(WordInfo.EMPTY_WORD_INFO));
+        assertEquals(new NgramContext(WordInfo.EMPTY_WORD_INFO),
+                new NgramContext(WordInfo.EMPTY_WORD_INFO));
+    }
+
+    public void testIsBeginningOfSentenceContext() {
+        assertFalse(new NgramContext().isBeginningOfSentenceContext());
+        assertTrue(new NgramContext(WordInfo.BEGINNING_OF_SENTENCE)
+                .isBeginningOfSentenceContext());
+        assertTrue(NgramContext.BEGINNING_OF_SENTENCE.isBeginningOfSentenceContext());
+        assertFalse(new NgramContext(new WordInfo("a")).isBeginningOfSentenceContext());
+        assertFalse(new NgramContext(new WordInfo("")).isBeginningOfSentenceContext());
+        assertFalse(new NgramContext(WordInfo.EMPTY_WORD_INFO).isBeginningOfSentenceContext());
+        assertTrue(new NgramContext(WordInfo.BEGINNING_OF_SENTENCE, new WordInfo("a"))
+                .isBeginningOfSentenceContext());
+        assertFalse(new NgramContext(new WordInfo("a"), WordInfo.BEGINNING_OF_SENTENCE)
+                .isBeginningOfSentenceContext());
+        assertFalse(new NgramContext(WordInfo.EMPTY_WORD_INFO, WordInfo.BEGINNING_OF_SENTENCE)
+                .isBeginningOfSentenceContext());
+    }
+
+    public void testGetNextNgramContext() {
+        final NgramContext ngramContext_a = new NgramContext(new WordInfo("a"));
+        final NgramContext ngramContext_b_a =
+                ngramContext_a.getNextNgramContext(new WordInfo("b"));
+        assertEquals("b", ngramContext_b_a.getNthPrevWord(1));
+        assertEquals("a", ngramContext_b_a.getNthPrevWord(2));
+        final NgramContext ngramContext_bos_b =
+                ngramContext_b_a.getNextNgramContext(WordInfo.BEGINNING_OF_SENTENCE);
+        assertTrue(ngramContext_bos_b.isBeginningOfSentenceContext());
+        assertEquals("b", ngramContext_bos_b.getNthPrevWord(2));
+        final NgramContext ngramContext_c_bos =
+                ngramContext_b_a.getNextNgramContext(new WordInfo("c"));
+        assertEquals("c", ngramContext_c_bos.getNthPrevWord(1));
+    }
+}