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+// 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.
+
+// Do some basic tests.
+couchTests.basics = function(debug) {
+  var result = JSON.parse(CouchDB.request("GET", "/").responseText);
+  T(result.couchdb == "Welcome");
+
+  var db = new CouchDB("test_suite_db", {"X-Couch-Full-Commit":"false"});
+  db.deleteDb();
+
+  // bug COUCHDB-100: DELETE on non-existent DB returns 500 instead of 404
+  db.deleteDb();
+
+  db.createDb();
+
+  // PUT on existing DB should return 412 instead of 500
+  xhr = CouchDB.request("PUT", "/test_suite_db/");
+  T(xhr.status == 412);
+  if (debug) debugger;
+
+  // creating a new DB should return Location header
+  // and it should work for dbs with slashes (COUCHDB-411)
+  var dbnames = ["test_suite_db", "test_suite_db%2Fwith_slashes"];
+  dbnames.forEach(function(dbname) {
+    xhr = CouchDB.request("DELETE", "/" + dbname);
+    xhr = CouchDB.request("PUT", "/" + dbname);
+    TEquals(dbname,
+      xhr.getResponseHeader("Location").substr(-dbname.length),
+      "should return Location header to newly created document");
+
+    TEquals("http://",
+      xhr.getResponseHeader("Location").substr(0, 7),
+      "should return absolute Location header to newly created document");
+  });
+
+  // Get the database info, check the db_name
+  T(db.info().db_name == "test_suite_db");
+  T(CouchDB.allDbs().indexOf("test_suite_db") != -1)
+
+  // Get the database info, check the doc_count
+  T(db.info().doc_count == 0);
+
+  // create a document and save it to the database
+  var doc = {_id:"0",a:1,b:1};
+  var result = db.save(doc);
+
+  T(result.ok==true); // return object has an ok member with a value true
+  T(result.id); // the _id of the document is set.
+  T(result.rev); // the revision id of the document is set.
+
+  // Verify the input doc is now set with the doc id and rev
+  // (for caller convenience).
+  T(doc._id == result.id && doc._rev == result.rev);
+
+  var id = result.id; // save off the id for later
+
+  // make sure the revs_info status is good
+  var doc = db.open(id, {revs_info:true});
+  T(doc._revs_info[0].status == "available");
+
+  // make sure you can do a seq=true option
+  var doc = db.open(id, {local_seq:true});
+  T(doc._local_seq == 1);
+
+
+  // Create some more documents.
+  // Notice the use of the ok member on the return result.
+  T(db.save({_id:"1",a:2,b:4}).ok);
+  T(db.save({_id:"2",a:3,b:9}).ok);
+  T(db.save({_id:"3",a:4,b:16}).ok);
+
+  // Check the database doc count
+  T(db.info().doc_count == 4);
+
+  // Test a simple map functions
+
+  // create a map function that selects all documents whose "a" member
+  // has a value of 4, and then returns the document's b value.
+  var mapFunction = function(doc){
+    if (doc.a==4)
+      emit(null, doc.b);
+  };
+
+  results = db.query(mapFunction);
+
+  // verify only one document found and the result value (doc.b).
+  T(results.total_rows == 1 && results.rows[0].value == 16);
+
+  // reopen document we saved earlier
+  existingDoc = db.open(id);
+
+  T(existingDoc.a==1);
+
+  //modify and save
+  existingDoc.a=4;
+  db.save(existingDoc);
+
+  // redo the map query
+  results = db.query(mapFunction);
+
+  // the modified document should now be in the results.
+  T(results.total_rows == 2);
+
+  // write 2 more documents
+  T(db.save({a:3,b:9}).ok);
+  T(db.save({a:4,b:16}).ok);
+
+  results = db.query(mapFunction);
+
+  // 1 more document should now be in the result.
+  T(results.total_rows == 3);
+  T(db.info().doc_count == 6);
+
+  var reduceFunction = function(keys, values){
+    return sum(values);
+  };
+
+  results = db.query(mapFunction, reduceFunction);
+
+  T(results.rows[0].value == 33);
+
+  // delete a document
+  T(db.deleteDoc(existingDoc).ok);
+
+  // make sure we can't open the doc
+  T(db.open(existingDoc._id) == null);
+
+  results = db.query(mapFunction);
+
+  // 1 less document should now be in the results.
+  T(results.total_rows == 2);
+  T(db.info().doc_count == 5);
+
+  // make sure we can still open the old rev of the deleted doc
+  T(db.open(existingDoc._id, {rev: existingDoc._rev}) != null);
+  // make sure restart works
+  T(db.ensureFullCommit().ok);
+  restartServer();
+
+  // make sure we can still open
+  T(db.open(existingDoc._id, {rev: existingDoc._rev}) != null);
+
+  // test that the POST response has a Location header
+  var xhr = CouchDB.request("POST", "/test_suite_db", {
+    body: JSON.stringify({"foo":"bar"}),
+    headers: {"Content-Type": "application/json"}
+  });
+  var resp = JSON.parse(xhr.responseText);
+  T(resp.ok);
+  var loc = xhr.getResponseHeader("Location");
+  T(loc, "should have a Location header");
+  var locs = loc.split('/');
+  T(locs[4] == resp.id);
+  T(locs[3] == "test_suite_db");
+
+  // test that that POST's with an _id aren't overriden with a UUID.
+  var xhr = CouchDB.request("POST", "/test_suite_db", {
+    headers: {"Content-Type": "application/json"},
+    body: JSON.stringify({"_id": "oppossum", "yar": "matey"})
+  });
+  var resp = JSON.parse(xhr.responseText);
+  T(resp.ok);
+  T(resp.id == "oppossum");
+  var doc = db.open("oppossum");
+  T(doc.yar == "matey");
+
+  // document put's should return a Location header
+  var xhr = CouchDB.request("PUT", "/test_suite_db/newdoc", {
+    body: JSON.stringify({"a":1})
+  });
+  TEquals("/test_suite_db/newdoc",
+    xhr.getResponseHeader("Location").substr(-21),
+    "should return Location header to newly created document");
+
+  TEquals("http://",
+    xhr.getResponseHeader("Location").substr(0, 7),
+    "should return absolute Location header to newly created document");
+
+  // deleting a non-existent doc should be 404
+  xhr = CouchDB.request("DELETE", "/test_suite_db/doc-does-not-exist");
+  T(xhr.status == 404);
+
+  // Check for invalid document members
+  bad_docs = [
+    ["goldfish", {"_zing": 4}],
+    ["zebrafish", {"_zoom": "hello"}],
+    ["mudfish", {"zane": "goldfish", "_fan": "something smells delicious"}],
+    ["tastyfish", {"_bing": {"wha?": "soda can"}}]
+  ]
+  var test_doc = function(info) {
+  var data = JSON.stringify(info[1]);
+    xhr = CouchDB.request("PUT", "/test_suite_db/" + info[0], {body: data});
+    T(xhr.status == 500);
+    result = JSON.parse(xhr.responseText);
+    T(result.error == "doc_validation");
+
+    xhr = CouchDB.request("POST", "/test_suite_db/", {
+      headers: {"Content-Type": "application/json"},
+      body: data
+    });
+    T(xhr.status == 500);
+    result = JSON.parse(xhr.responseText);
+    T(result.error == "doc_validation");
+  };
+  bad_docs.forEach(test_doc);
+
+  // Check some common error responses.
+  // PUT body not an object
+  xhr = CouchDB.request("PUT", "/test_suite_db/bar", {body: "[]"});
+  T(xhr.status == 400);
+  result = JSON.parse(xhr.responseText);
+  T(result.error == "bad_request");
+  T(result.reason == "Document must be a JSON object");
+
+  // Body of a _bulk_docs is not an object
+  xhr = CouchDB.request("POST", "/test_suite_db/_bulk_docs", {body: "[]"});
+  T(xhr.status == 400);
+  result = JSON.parse(xhr.responseText);
+  T(result.error == "bad_request");
+  T(result.reason == "Request body must be a JSON object");
+
+  // Body of an _all_docs  multi-get is not a {"key": [...]} structure.
+  xhr = CouchDB.request("POST", "/test_suite_db/_all_docs", {body: "[]"});
+  T(xhr.status == 400);
+  result = JSON.parse(xhr.responseText);
+  T(result.error == "bad_request");
+  T(result.reason == "Request body must be a JSON object");
+  var data = "{\"keys\": 1}";
+  xhr = CouchDB.request("POST", "/test_suite_db/_all_docs", {body:data});
+  T(xhr.status == 400);
+  result = JSON.parse(xhr.responseText);
+  T(result.error == "bad_request");
+  T(result.reason == "`keys` member must be a array.");
+
+  // oops, the doc id got lost in code nirwana
+  xhr = CouchDB.request("DELETE", "/test_suite_db/?rev=foobarbaz");
+  TEquals(400, xhr.status, "should return a bad request");
+  result = JSON.parse(xhr.responseText);
+  TEquals("bad_request", result.error);
+  TEquals("You tried to DELETE a database with a ?=rev parameter. Did you mean to DELETE a document instead?", result.reason);
+};