easier to debug tests

jstests/exists6.js

@@ -10,9 +10,13 @@ t.save( {b:null} );
 
 checkExists = function( query ) {
     // Index range constraint on 'b' is universal, so a BasicCursor is the default cursor type.
-    assert.eq( 'BasicCursor', t.find( query ).explain().cursor );
+    var x = t.find( query ).explain()
+    assert.eq( 'BasicCursor', x.cursor , tojson(x) );
     // Index bounds include all elements.
-    assert.eq( [ [ { $minElement:1 }, { $maxElement:1 } ] ], t.find( query ).hint( {b:1} ).explain().indexBounds.b );
+
+    var x = t.find( query ).hint( {b:1} ).explain()
+    if ( ! x.indexBounds ) x.indexBounds = {}
+    assert.eq( [ [ { $minElement:1 }, { $maxElement:1 } ] ], x.indexBounds.b , tojson(x) );
     // All keys must be scanned.
     assert.eq( 3, t.find( query ).hint( {b:1} ).explain().nscanned );
     // 2 docs will match.

jstests/or5.js

@@ -6,6 +6,7 @@ t.ensureIndex( {b:1} );
 
 assert.eq.automsg( "'BasicCursor'", "t.find( {$or:[{a:2},{b:3},{}]} ).explain().cursor" );
 assert.eq.automsg( "'BasicCursor'", "t.find( {$or:[{a:2},{b:3},{c:4}]} ).explain().cursor" );
+printjson( t.find( {$or:[{a:2},{b:3}]} ).sort( {c:1} ).explain() );
 assert.eq.automsg( "'BasicCursor'", "t.find( {$or:[{a:2},{b:3}]} ).sort( {c:1} ).explain().cursor" );
 e = t.find( {$or:[{a:2},{b:3}]} ).sort( {a:1} ).explain();
 assert.eq.automsg( "'BtreeCursor a_1'", "e.cursor" );

jstests/queryoptimizer4.js

@@ -24,7 +24,8 @@ function reset( matches, filler ) {
 function checkCursor( query, cursor ) {
     t.find(query).itcount();
     // Check that index on 'cursor' was chosen in the above query.
-    assert.eq( 'BtreeCursor ' + cursor, t.find(query).explain(true).oldPlan.cursor );    
+    var x = t.find(query).explain(true);
+    assert.eq( 'BtreeCursor ' + cursor, x.oldPlan.cursor , tojson(x) );    
 }
 
 // Check {b:1} takes over when {a:1} is much worse for query {a:100,b:100}.

jstests/queryoptimizer7.js

@@ -3,7 +3,8 @@
 t = db.jstests_queryoptimizer7;
 
 function assertPlanWasRecorded( query ) {
-    assert.eq( 'BtreeCursor a_1', t.find( query ).explain( true ).oldPlan.cursor );
+    var x = t.find( query ).explain( true );
+    assert.eq( 'BtreeCursor a_1', x.oldPlan.cursor , tojson(x) );
 }
 
 function assertNoPlanWasRecorded( query ) {