diff --git a/client/lib/databasable.js b/client/lib/databasable.js
new file mode 100644
index 0000000..673d0cb
--- /dev/null
+++ b/client/lib/databasable.js
@@ -0,0 +1,43 @@
+const DEFAULTS = {
+  adapter: ''
+};
+
+var databasable = {
+
+  accessDb: function(db_name, opts){
+    var databasable = this;
+    opts = Object.assign(Object.assign({}, DEFAULTS), opts || {});
+    return new Promise((fnResolve, fnReject){
+      if (!databasable.db) {
+        databasable.db = new Loki(db_name, opts);
+        databasable.db.loadDatabase({}, ()=>{
+          fnResolve(databasable.db);
+        });
+      } else { fnResolve(databasable.db); }
+    });
+  },
+
+  closeDb: function(){
+    var databasable = this;
+    if (databasable.db){
+      databasable.db.save();
+      databasable.db.close();
+      databasable.db = undefined;
+    }
+  },
+
+  collection(collection_name, options){
+    var databasable = this;
+    databasable.accessDb()
+      .then((db)=>{
+        var collection = db.getCollection(collection_name)
+        if (!collection){
+          collection = db.addCollection(collection_name, options);
+        }
+        return collection;
+      });
+  }
+
+};
+
+export default databaseable;
diff --git a/client/models/house.js b/client/models/house.js
index ef105a7..d4bb143 100644
--- a/client/models/house.js
+++ b/client/models/house.js
@@ -11,35 +11,39 @@ import MathUtil from './../../shared/utils/math'
 
 class House {
 
+  // must be initiated with a dataset already in Loki database (not directly JSON).
   constructor(data){
     var house = this;
-    House.store.set(data.id, house);
     house.data = data;
-    house.energy_data = [];
-    house.power_data = [];
-    house.energy_data_store = new Map();
-    house.power_data_store = new Map();
-
-    house.initDatabase();
+    Object.assign(house, Databasable);
   }
 
-  get react_key(){
+  get scoped_id(){
     return `house-${this.data.id}`;
   }
 
+  save(){
+    var house = this;
+    return House.collection()
+      .then((house_collection)=>{
+        return house_collection.update(house.data);
+      })
+  }
+
   ensurePowerData(opts){
     opts = extend({
       start_date: undefined,
       end_date: undefined
     }, opts || {});
-    var house = this;
+    var house = this,
+      query_ranges = DateUtil.dateOverlaps([opts.start_date, opts.end_date], house.data.query_dates]);
 
-    // check mins and maxes.
-    house.initCollection(PowerDatum.NAME).then(()=>{
-      house.power_datum_collection.
-    });
 
-    return Promise.resolve(cache);
+
+    house.collection(PowerDatum.name, {})
+      .then((power_collection)=>{
+
+      })
   }
 
   getPowerData(params){
@@ -115,20 +119,20 @@ class House {
 
   static accessDb(){
     return new Promise((fnResolve, fnReject){
-      if (!this.db) {
-        this.db = new Loki('houses', adapter: '');
-        this.db.loadDatabase({}, ()=>{
-          fnResolve(this.db);
+      if (!House.db) {
+        House.db = new Loki('houses', adapter: '');
+        House.db.loadDatabase({}, ()=>{
+          fnResolve(House.db);
         });
-      } else { fnResolve(this.db); }
+      } else { fnResolve(House.db); }
     });
   }
 
   static closeDb(){
-    if (this.db){
-      this.db.save();
-      this.db.close();
-      this.db = undefined;
+    if (House.db){
+      House.db.save();
+      House.db.close();
+      House.db = undefined;
     }
   }
 
@@ -174,6 +178,4 @@ class House {
 
 }
 
-House.store = new Map();
-
 export default House;
diff --git a/gulpfile.babel.js b/gulpfile.babel.js
index 46415ed..857be1c 100644
--- a/gulpfile.babel.js
+++ b/gulpfile.babel.js
@@ -40,6 +40,8 @@ gulp.task('build', function(done) {
     env = 'production';
   } else if (yargs.argv.design){
     env = 'design';
+  } else if (yargs.argv.test){
+    env = 'test';
   } else {
     throw new gutil.PluginError("webpack", "Must include '--production' or '--design' option.");
   }
@@ -52,5 +54,15 @@ gulp.task('build', function(done) {
     }));
     done();
   });
-
+});
+
+gulp.task('test', function(done) {
+  var Jasmine = require('jasmine');
+  var jasmine = new Jasmine();
+
+  jasmine.loadConfigFile('test/jasmine.json');
+  jasmine.configureDefaultReporter({
+      showColors: true
+  });
+  jasmine.execute();
 });
diff --git a/package.json b/package.json
index 1922ea9..f1996bf 100644
--- a/package.json
+++ b/package.json
@@ -22,9 +22,6 @@
     "babel-preset-stage-0": "6.3.13",
     "babel-core": "6.3.21",
     "babel-loader": "6.2.0",
-    "babel-preset-es2015": "6.3.13",
-    "babel-preset-react": "6.3.13",
-    "babel-preset-stage-0": "6.3.13",
     "express": "4.13.3",
     "react": "0.14.3",
     "react-dom": "0.14.3",
@@ -40,17 +37,22 @@
     "style-loader": "^0.12.3",
     "json-loader": "0.5.4",
     "node-sass": "3.4.2",
-    "moment-timezone":"0.5.0",
+    "moment-timezone": "0.5.0",
     "yargs": "3.32.0",
     "extend": "3.0.0",
     "through2": "2.0.1",
-    "lokijs": "1.3.11"
-  },
-  "devDependencies": {
-    "gulp": "^3.9.0",
-    "gulp-util": "3.0.7",
+    "lokijs": "1.3.11",
     "babel-cli": "^6.3.17",
     "babel-standalone": "6.4.4",
-    "react-templates": "0.4.1"
+    "gulp": "^3.9.0",
+    "gulp-util": "3.0.7",
+    "jasmine-core": "2.4.1",
+    "karma": "^0.13.19",
+    "karma-babel-preprocessor": "^6.0.1",
+    "karma-chrome-launcher": "^0.2.2",
+    "karma-jasmine": "^0.3.6",
+    "react-templates": "0.4.1",
+    "requirejs": "~2.1",
+    "jasmine-es6": "0.1.4"
   }
 }
diff --git a/shared/utils/date.js b/shared/utils/date.js
new file mode 100644
index 0000000..93b6815
--- /dev/null
+++ b/shared/utils/date.js
@@ -0,0 +1,77 @@
+class DateUtil {
+
+  static addRange(new_range, ranges){
+    var gaps_filled = [], new_ranges = [],
+      start = new_range[0], end = new_range[1];
+    if (start === undefined && end === undefined && ranges.length === 0){
+      gaps_filled = [undefined, undefined];
+      new_ranges = [[undefined, undefined]];
+    } else if (ranges.length === 0){
+      gaps_filled = [new_range];
+      new_ranges = [new_range]
+    } else {
+      var covered = false,
+        last_start = start,
+        last_end = start;
+
+      ranges.forEach((range, i)=>{
+        if (covered){ new_ranges.push(range); return true; }
+        if (DateUtil.lte(start, range[0])){
+          if (end && !DateUtil.eq(end, range[0]) && DateUtil.lte(end, range[0])){
+            new_ranges.push([last_start, end]);
+            new_ranges.push(range);
+            gaps_filled.push([last_end, end]);
+            covered = true;
+          } else if (end && !DateUtil.gte(end, range[1])) {
+            new_ranges.push([last_start, range[1]]);
+            if (range[0] && !DateUtil.eq(last_end, range[0])){ gaps_filled.push([last_end, range[0]]); }
+            covered = true
+          } else {
+            if (range[0] && !DateUtil.eq(last_end, range[0])) gaps_filled.push([last_end, range[0]]);
+            last_end = range[1]
+          }
+        } else if (start && DateUtil.gte(range[1], start)){
+            if (!DateUtil.eq(end, range[1]) && DateUtil.gte(end, range[1])){
+              last_start = range[0];
+              last_end = range[1];
+            } else {
+              new_ranges.push(range);
+              covered = true;
+            }
+        } else { new_ranges.push(range); }
+      });
+      if (!covered) {
+        new_ranges.push([last_start, end]);
+        if (!DateUtil.eq(last_end, end)) gaps_filled.push([last_end, end]);
+      }
+    }
+
+    return { gaps_filled: gaps_filled, new_ranges: new_ranges }
+  }
+
+  static min(date1, date2){
+
+  }
+
+  static max(date1, date2){
+
+  }
+
+  static gte(date1, date2){
+    return (date1 === undefined || (date2 !== undefined && date1 >= date2));
+  }
+
+  static lte(date1, date2){
+    return (date1 === undefined || (date2 !== undefined && date1 <= date2));
+  }
+
+  static eq(date1, date2){
+    return (date1 !== undefined && date2 !== undefined && date1.getTime() === date2.getTime()) || date1 === undefined && date2 === undefined
+  }
+
+  static add(date, s){
+    return new Date(date.getTime() + s);
+  }
+
+}
+export default DateUtil;
diff --git a/spec/shared/util/date.test.js b/spec/shared/util/date.test.js
new file mode 100644
index 0000000..8daa3d9
--- /dev/null
+++ b/spec/shared/util/date.test.js
@@ -0,0 +1,450 @@
+"use strict";
+
+import DateUtil from './../../../shared/utils/date.js';
+
+function rangeEquivalent(range1, range2){
+  if (range1 && !range2 || !range1 && range2) return false
+    var equivalent = true
+  if (range1[0] && range2[0]) {
+    equivalent = range1[0].getTime() === range2[0].getTime();
+  } else {
+    equivalent = range1[0] === range2[0];
+  }
+  if (!equivalent) return false;
+  if (range1[1] && range2[1]) {
+    equivalent = range1[1].getTime() === range2[1].getTime();
+  } else {
+    equivalent = range1[1] === range2[1];
+  }
+  return equivalent
+}
+function rangesEquivalent(a1, a2){
+    var match = true;
+    if (a1.length !== a2.length) return false;
+    a1.forEach((range, i)=>{
+      if (!rangeEquivalent(range, a2[i])) match = false; return false;
+    });
+    return match;
+}
+
+
+describe('DateUtil.gte', ()=>{
+
+  it('considers undefined as a large date', ()=>{
+    var date1 = new Date(),
+      date2 = new Date(date1.getTime() + 1000);
+    expect(DateUtil.gte(undefined, date1)).toEqual(true);
+    expect(DateUtil.gte(undefined, undefined)).toEqual(true);
+    expect(DateUtil.gte(date1, undefined)).toEqual(false);
+    expect(DateUtil.gte(date1, date2)).toEqual(false);
+    expect(DateUtil.gte(date2, date1)).toEqual(true);
+  });
+});
+
+
+describe('DateUtil.lte', ()=>{
+  it('considers undefined as a small date', ()=>{
+    var date1 = new Date(),
+      date2 = new Date(date1.getTime() + 1000);
+    expect(DateUtil.lte(undefined, date1)).toEqual(true);
+    expect(DateUtil.lte(undefined, undefined)).toEqual(true);
+    expect(DateUtil.lte(date1, undefined)).toEqual(false);
+    expect(DateUtil.lte(date1, date2)).toEqual(true);
+    expect(DateUtil.lte(date2, date1)).toEqual(false);
+  });
+});
+
+describe('DateUtil.addRange', ()=>{
+  var date1 = new Date(),
+    date01 = DateUtil.add(date1, -1000),
+    date11 = DateUtil.add(date1, 1000),
+    date2 = DateUtil.add(date1, 2000),
+    date21 = DateUtil.add(date2, 1000),
+    date3 = DateUtil.add(date2, 2000),
+    date31 = DateUtil.add(date3, 1000),
+    date4 = DateUtil.add(date3, 2000),
+    date41 = DateUtil.add(date4, 1000),
+    date5 = DateUtil.add(date4, 2000),
+    date51 = DateUtil.add(date5, 1000),
+    date6 = DateUtil.add(date5, 2000),
+    date61 = DateUtil.add(date6, 1000),
+    date7 = DateUtil.add(date6, 2000),
+    date71 = DateUtil.add(date7, 1000);
+
+  describe('no ranges exist', ()=>{
+    it('returns the new ranges', ()=>{
+      var result = DateUtil.addRange([date1, date2], []);
+      expect(rangesEquivalent(result.gaps_filled, [[date1, date2]])).toBeTruthy();
+      expect(rangesEquivalent(result.new_ranges, [[date1, date2]])).toBeTruthy();
+    });
+  });
+
+  describe('infinite range exists', ()=>{
+    it('returns the infinite range, no gaps filled', ()=>{
+      var result = DateUtil.addRange([date1, date2], [[undefined, undefined]]);
+      expect(rangesEquivalent(result.gaps_filled, [])).toBeTruthy();
+      expect(rangesEquivalent(result.new_ranges, [[undefined, undefined]])).toBeTruthy();
+    });
+  });
+
+  describe('-Infinity to definite date exists', ()=>{
+    describe('with gaps', ()=>{
+      var ranges = [[undefined, date1], [date2, date3], [date4, date5]];
+
+      describe('new range low low', ()=>{
+        var new_range = [undefined, date01];
+        it('no gaps filled', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([])
+          expect(result.new_ranges).toEqual(ranges);
+        });
+      });
+
+      describe('new range low mid', ()=>{
+        var new_range = [undefined, date31];
+        it('fills mid gaps', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([[date1, date2], [date3, date31]]);
+          expect(result.new_ranges).toEqual([[undefined, date31], [date4, date5]]);
+        });
+      });
+
+      describe('new range low high', ()=>{
+        var new_range = [undefined, date61];
+        it('fills mid and high gaps', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([[date1, date2], [date3, date4], [date5, date61]]);
+          expect(result.new_ranges).toEqual([[undefined, date61]]);
+        });
+      });
+
+
+      describe('new range mid mid', ()=>{
+        var new_range = [date11, date41];
+        it('includes gaps', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([[date11, date2], [date3, date4]])
+          expect(result.new_ranges).toEqual([[undefined, date1], [date11, date5]]);
+        });
+      });
+
+      describe('new range mid high', ()=>{
+        var new_range = [date11, date61];
+        it('includes gaps', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([[date11, date2], [date3, date4], [date5, date61]]);
+          expect(result.new_ranges).toEqual([[undefined, date1], [date11, date61]]);
+        });
+      });
+
+      describe('new range high high', ()=>{
+        var new_range = [date5, date61];
+        it('includes gaps', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([[date5, date61]]);
+          expect(result.new_ranges).toEqual([[undefined, date1], [date2, date3], [date4, date61]]);
+        });
+      });
+
+    });
+
+    describe('no gaps', ()=>{
+      var ranges = [[undefined, date1]];
+
+      describe('new range low low', ()=>{
+        var new_range = [undefined, date01];
+        it('no gaps filled', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([])
+          expect(result.new_ranges).toEqual([[undefined, date1]]);
+        });
+      });
+
+      describe('new range low mid', ()=>{
+        var new_range = [undefined, date1];
+        it('fills mid gaps', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([]);
+          expect(result.new_ranges).toEqual([[undefined, date1]]);
+        });
+      });
+
+      describe('new range low high', ()=>{
+        var new_range = [undefined, date61];
+        it('fills mid and high gaps', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([[date1, date61]]);
+          expect(result.new_ranges).toEqual([[undefined, date61]]);
+        });
+      });
+
+
+      describe('new range mid mid', ()=>{
+        var new_range = [date01, date1];
+        it('includes gaps', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([])
+          expect(result.new_ranges).toEqual([[undefined, date1]]);
+        });
+      });
+
+      describe('new range mid high', ()=>{
+        var new_range = [date1, date61];
+        it('includes gaps', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([[date1, date61]]);
+          expect(result.new_ranges).toEqual([[undefined, date61]]);
+        });
+      });
+
+      describe('new range high high', ()=>{
+        var new_range = [date5, date61];
+        it('includes gaps', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([[date5, date61]]);
+          expect(result.new_ranges).toEqual([[undefined, date1], [date5, date61]]);
+        });
+      });
+    });
+  });
+
+  describe('definite to Infinity range exists', ()=>{
+    describe('with gaps', ()=>{
+      var ranges = [[date1, date2], [date3, date4], [date5, undefined]];
+
+      describe('new range low low', ()=>{
+        var new_range = [undefined, date01];
+        it('no gaps filled', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([[undefined, date01]]);
+          expect(result.new_ranges).toEqual([[undefined, date01], [date1, date2], [date3, date4], [date5, undefined]]);
+        });
+      });
+
+      describe('new range low mid', ()=>{
+        var new_range = [undefined, date3];
+        it('fills mid gaps', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([[undefined, date1], [date2, date3]]);
+          expect(result.new_ranges).toEqual([[undefined, date4], [date5, undefined]]);
+        });
+      });
+
+      describe('new range low high', ()=>{
+        var new_range = [undefined, date61];
+        it('fills mid and high gaps', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([[undefined, date1], [date2, date3], [date4, date5]]);
+          expect(result.new_ranges).toEqual([[undefined, undefined]]);
+        });
+      });
+
+      describe('new range mid mid', ()=>{
+        var new_range = [date1, date41];
+        it('includes gaps', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([[date2, date3], [date4, date41]]);
+          expect(result.new_ranges).toEqual([[date1, date41], [date5, undefined]]);
+        });
+      });
+
+      describe('new range mid high', ()=>{
+        var new_range = [date31, date61];
+        it('includes gaps', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([[date4, date5]]);
+          expect(result.new_ranges).toEqual([[date1, date2], [date3, undefined]]);
+        });
+      });
+
+      describe('new range high high', ()=>{
+        var new_range = [date5, date61];
+        it('includes gaps', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([]);
+          expect(result.new_ranges).toEqual([[date1, date2], [date3, date4], [date5, undefined]]);
+        });
+      });
+    });
+
+    describe('no gaps', ()=>{
+      var ranges = [[date1, undefined]];
+
+      describe('new range low low', ()=>{
+        var new_range = [undefined, date01];
+        it('no gaps filled', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([[undefined, date01]]);
+          expect(result.new_ranges).toEqual([[undefined, date01], [date1, undefined]]);
+        });
+      });
+
+      describe('new range low mid', ()=>{
+        var new_range = [undefined, date1];
+        it('fills mid gaps', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([[undefined, date1]]);
+          expect(result.new_ranges).toEqual([[undefined, undefined]]);
+        });
+      });
+
+      describe('new range low high', ()=>{
+        var new_range = [undefined, date61];
+        it('fills mid and high gaps', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([[undefined, date1]]);
+          expect(result.new_ranges).toEqual([[undefined, undefined]]);
+        });
+      });
+
+      describe('new range mid mid', ()=>{
+        var new_range = [date1, date1];
+        it('includes gaps', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([]);
+          expect(result.new_ranges).toEqual([[date1, undefined]]);
+        });
+      });
+
+      describe('new range mid high', ()=>{
+        var new_range = [date1, undefined];
+        it('includes gaps', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([]);
+          expect(result.new_ranges).toEqual([[date1, undefined]]);
+        });
+      });
+
+      describe('new range high high', ()=>{
+        var new_range = [date5, undefined];
+        it('includes gaps', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([]);
+          expect(result.new_ranges).toEqual([[date1, undefined]]);
+        });
+      });
+
+    });
+  });
+
+  describe('definite range exists', ()=>{
+    describe('with gaps', ()=>{
+      var ranges = [[date1, date2], [date3, date4], [date5, date6]];
+
+      describe('new range low low', ()=>{
+        var new_range = [undefined, date01];
+        it('no gaps filled', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([[undefined, date01]]);
+          expect(result.new_ranges).toEqual([[undefined, date01], [date1, date2], [date3, date4], [date5, date6]]);
+        });
+      });
+
+      describe('new range low mid', ()=>{
+        var new_range = [undefined, date41];
+        it('fills mid gaps', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([[undefined, date1], [date2, date3], [date4, date41]]);
+          expect(result.new_ranges).toEqual([[undefined, date41], [date5, date6]]);
+        });
+      });
+
+      describe('new range low high', ()=>{
+        var new_range = [undefined, date61];
+        it('fills mid and high gaps', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([[undefined, date1], [date2, date3], [date4, date5], [date6, date61]]);
+          expect(result.new_ranges).toEqual([[undefined, date61]]);
+        });
+      });
+
+      describe('new range mid mid', ()=>{
+        var new_range = [date11, date41];
+        it('includes gaps', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([[date2, date3], [date4, date41]]);
+          expect(result.new_ranges).toEqual([[date1, date41], [date5, date6]]);
+        });
+      });
+
+      describe('new range mid high', ()=>{
+        var new_range = [date31, undefined];
+        it('includes gaps', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([[date4, date5], [date6, undefined]]);
+          expect(result.new_ranges).toEqual([[date1, date2], [date3, undefined]]);
+        });
+      });
+
+      describe('new range high high', ()=>{
+        var new_range = [date61, undefined];
+        it('includes gaps', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([[date61, undefined]]);
+          expect(result.new_ranges).toEqual([[date1, date2], [date3, date4], [date5, date6], [date61, undefined]]);
+        });
+      });
+
+    });
+
+    describe('no gaps', ()=>{
+      var ranges = [[date1, date2]];
+
+      describe('new range low low', ()=>{
+        var new_range = [undefined, date01];
+        it('no gaps filled', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([[undefined, date01]]);
+          expect(result.new_ranges).toEqual([[undefined, date01], [date1, date2]]);
+        });
+      });
+
+      describe('new range low mid', ()=>{
+        var new_range = [undefined, date11];
+        it('fills mid gaps', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([[undefined, date1]]);
+          expect(result.new_ranges).toEqual([[undefined, date2]]);
+        });
+      });
+
+      describe('new range low high', ()=>{
+        var new_range = [undefined, date61];
+        it('fills mid and high gaps', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([[undefined, date1], [date2, date61]]);
+          expect(result.new_ranges).toEqual([[undefined, date61]]);
+        });
+      });
+
+      describe('new range mid mid', ()=>{
+        var new_range = [date11, date2];
+        it('includes gaps', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([]);
+          expect(result.new_ranges).toEqual([[date1, date2]]);
+        });
+      });
+
+      describe('new range mid high', ()=>{
+        var new_range = [date11, undefined];
+        it('includes gaps', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([[date2, undefined]]);
+          expect(result.new_ranges).toEqual([[date1, undefined]]);
+        });
+      });
+
+      describe('new range high high', ()=>{
+        var new_range = [date61, undefined];
+        it('includes gaps', ()=>{
+          var result = DateUtil.addRange(new_range, ranges);
+          expect(result.gaps_filled).toEqual([[date61, undefined]]);
+          expect(result.new_ranges).toEqual([[date1, date2], [date61, undefined]]);
+        });
+      });
+
+    });
+  });
+
+});
diff --git a/spec/support/jasmine.json b/spec/support/jasmine.json
new file mode 100644
index 0000000..bcaf67b
--- /dev/null
+++ b/spec/support/jasmine.json
@@ -0,0 +1,12 @@
+{
+  "spec_dir": "spec",
+  "spec_files": [
+    "**/*.test.js"
+  ],
+  "helpers": [
+    "../node_modules/babel-core/register.js",
+    "helpers/**/*.js"
+  ],
+  "stopSpecOnExpectationFailure": false,
+  "random": false
+}