Fix unit tests

Author: schmidt-sebastian

firebase-firestore/src/test/java/com/google/firebase/firestore/DocumentSnapshotTest.java

@@ -45,12 +45,13 @@ public void testEquals() {
     assertNotEquals(base, differentData);
     assertNotEquals(base, fromCache);
 
+    // Note: base and differentData have the same hash code since we no longer take document
+    // contents into account.
     assertEquals(base.hashCode(), baseDup.hashCode());
     assertEquals(noData.hashCode(), noDataDup.hashCode());
     assertNotEquals(base.hashCode(), noData.hashCode());
     assertNotEquals(noData.hashCode(), base.hashCode());
     assertNotEquals(base.hashCode(), differentPath.hashCode());
-    assertNotEquals(base.hashCode(), differentData.hashCode());
     assertNotEquals(base.hashCode(), fromCache.hashCode());
   }
 }

firebase-firestore/src/test/java/com/google/firebase/firestore/QuerySnapshotTest.java

@@ -71,9 +71,10 @@ public void testEquals() {
     assertNotEquals(foo, noPendingWrites);
     assertNotEquals(foo, fromCache);
 
+    // Note: foo and differentDoc have the same hash code since we no longer take document contents
+    // into account.
     assertEquals(foo.hashCode(), fooDup.hashCode());
     assertNotEquals(foo.hashCode(), differentPath.hashCode());
-    assertNotEquals(foo.hashCode(), differentDoc.hashCode());
     assertNotEquals(foo.hashCode(), noPendingWrites.hashCode());
     assertNotEquals(foo.hashCode(), fromCache.hashCode());
   }

firebase-firestore/src/test/java/com/google/firebase/firestore/local/LocalStoreTestCase.java

@@ -229,15 +229,15 @@ public void testHandlesSetMutation() {
     assertChanged(doc("foo/bar", 0, map("foo", "bar"), Document.DocumentState.LOCAL_MUTATIONS));
     assertContains(doc("foo/bar", 0, map("foo", "bar"), Document.DocumentState.LOCAL_MUTATIONS));
 
-    acknowledgeMutation(0);
-    assertChanged(doc("foo/bar", 0, map("foo", "bar"), Document.DocumentState.COMMITTED_MUTATIONS));
+    acknowledgeMutation(1);
+    assertChanged(doc("foo/bar", 1, map("foo", "bar"), Document.DocumentState.COMMITTED_MUTATIONS));
     if (garbageCollectorIsEager()) {
       // Nothing is pinning this anymore, as it has been acknowledged and there are no targets
       // active.
       assertNotContains("foo/bar");
     } else {
       assertContains(
-          doc("foo/bar", 0, map("foo", "bar"), Document.DocumentState.COMMITTED_MUTATIONS));
+          doc("foo/bar", 1, map("foo", "bar"), Document.DocumentState.COMMITTED_MUTATIONS));
     }
   }
 

firebase-firestore/src/test/resources/json/listen_spec_test.json

@@ -582,7 +582,7 @@
           "docs": [
             {
               "key": "collection/a",
-              "version": 0,
+              "version": 1000,
               "value": {
                 "key": "a"
               },
@@ -620,7 +620,7 @@
             "added": [
               {
                 "key": "collection/a",
-                "version": 0,
+                "version": 1000,
                 "value": {
                   "key": "a"
                 },
@@ -648,7 +648,7 @@
             "removed": [
               {
                 "key": "collection/a",
-                "version": 0,
+                "version": 1000,
                 "value": {
                   "key": "a"
                 },

firebase-firestore/src/test/resources/json/orderby_spec_test.json

@@ -219,7 +219,7 @@
           "docs": [
             {
               "key": "collection/a",
-              "version": 0,
+              "version": 1000,
               "value": {
                 "key": "a",
                 "sort": 2
@@ -287,7 +287,7 @@
               },
               {
                 "key": "collection/a",
-                "version": 0,
+                "version": 1000,
                 "value": {
                   "key": "a",
                   "sort": 2
@@ -387,7 +387,7 @@
               },
               {
                 "key": "collection/a",
-                "version": 0,
+                "version": 1000,
                 "value": {
                   "key": "a",
                   "sort": 2