TextUtils: add mock class for TextUtils.isEmpty

Author: kbhardwaj123

app/src/test/java/android/text/TextUtils.java

@@ -0,0 +1,50 @@
+package android.text;
+
+/**
+ * This Class Mocks TextUtils for the purpose of testing.
+ * NOTE: This class would not change the function of the TextUtils used in app
+ * it onlt mocks it for the unit tests
+ * 
+ */
+public class TextUtils {
+    // mocks TextUtils.isEmpty
+    public static boolean isEmpty(CharSequence str) {
+        return str == null || str.length() == 0;
+    }
+
+    // mocks TextUtils.equals
+    public static boolean equals(CharSequence a, CharSequence b) {
+        if (a == b) return true;
+        int length;
+        if (a != null && b != null && (length = a.length()) == b.length()) {
+            if (a instanceof String && b instanceof String) {
+                return a.equals(b);
+            } else {
+                for (int i = 0; i < length; i++) {
+                    if (a.charAt(i) != b.charAt(i)) return false;
+                }
+                return true;
+            }
+        }
+        return false;
+    }
+
+    // mocks TextUtils.isDigitsOnly
+    public static boolean isDigitsOnly(CharSequence str) {
+        final int len = str.length();
+        for (int cp, i = 0; i < len; i += Character.charCount(cp)) {
+            cp = Character.codePointAt(str, i);
+            if (!Character.isDigit(cp)) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    // mocks TextUtils.isNewline
+    private static boolean isNewline(int codePoint) {
+        int type = Character.getType(codePoint);
+        return type == Character.PARAGRAPH_SEPARATOR || type == Character.LINE_SEPARATOR
+                || codePoint == 10;
+    }
+}