String of zero polynomial be "0" (#1020)

* String of zero polynomial be "0"

* add test

* add more test

* modify test case

1 files changed, 8 insertions, 1 deletions

diff --git a/core/src/test/java/com/google/zxing/common/reedsolomon/ReedSolomonTestCase.java b/core/src/test/java/com/google/zxing/common/reedsolomon/ReedSolomonTestCase.java
index 834433b10..c483d50e7 100644
--- a/core/src/test/java/com/google/zxing/common/reedsolomon/ReedSolomonTestCase.java
+++ b/core/src/test/java/com/google/zxing/common/reedsolomon/ReedSolomonTestCase.java
@@ -393,6 +393,13 @@ public final class ReedSolomonTestCase extends Assert {
     testEncodeDecodeRandom(GenericGF.AZTEC_DATA_12, 3072, 1023);
   }
 
+  @Test
+  public void testPolynomialString() {
+    assertEquals("0", GenericGF.QR_CODE_FIELD_256.getZero().toString());
+    GenericGFPoly p = new GenericGFPoly(GenericGF.QR_CODE_FIELD_256, new int[] {3, 0, -2, 1, 1});
+    assertEquals("a^25x^4 - ax^2 + x + 1", p.toString());
+  }
+
   public static void corrupt(int[] received, int howMany, Random random, int max) {
     BitSet corrupted = new BitSet(received.length);
     for (int j = 0; j < howMany; j++) {
@@ -503,4 +510,4 @@ public final class ReedSolomonTestCase extends Assert {
     return new Random(0xDEADBEEF);
   }
 
-}
\ No newline at end of file
+}