diff --git a/frontend/regimens/__tests__/reducer_test.ts b/frontend/regimens/__tests__/reducer_test.ts
index 3da4d84c9..3e5a47061 100644
--- a/frontend/regimens/__tests__/reducer_test.ts
+++ b/frontend/regimens/__tests__/reducer_test.ts
@@ -1,25 +1,22 @@
-import { regimensReducer, RegimenState } from "../reducer";
+import { regimensReducer, RegimenState, newWeek } from "../reducer";
 import { Actions } from "../../constants";
-import { popWeek, pushWeek, selectDays, deselectDays } from "../bulk_scheduler/actions";
+import {
+  popWeek, pushWeek, selectDays, deselectDays,
+} from "../bulk_scheduler/actions";
 import { defensiveClone } from "../../util";
+import { Week } from "../bulk_scheduler/interfaces";
+
+const week = newWeek();
+Object.entries(week.days).map(([day, _]: [keyof Week["days"], boolean]) => {
+  week.days[day] = true;
+});
+week.days.day7 = false;
 
 const STATE: RegimenState = {
   dailyOffsetMs: 300000,
   selectedSequenceUUID: "Sequence.71.167",
   currentRegimen: "Regimen.4.56",
-  weeks: [
-    {
-      "days": {
-        "day1": true,
-        "day2": true,
-        "day3": true,
-        "day4": true,
-        "day5": true,
-        "day6": true,
-        "day7": false
-      }
-    },
-  ],
+  weeks: [week],
   schedulerOpen: false,
 };
 
diff --git a/frontend/regimens/__tests__/week_row_test.tsx b/frontend/regimens/__tests__/week_row_test.tsx
deleted file mode 100644
index f4a32f6ba..000000000
--- a/frontend/regimens/__tests__/week_row_test.tsx
+++ /dev/null
@@ -1,39 +0,0 @@
-import * as React from "react";
-import { render } from "enzyme";
-import { WeekRow } from "../bulk_scheduler/week_row";
-import { WeekRowProps } from "../bulk_scheduler/interfaces";
-import { betterMerge } from "../../util";
-
-function weekProps(p?: Partial<WeekRowProps>): WeekRowProps {
-  return betterMerge({
-    dispatch: jest.fn(),
-    index: 0,
-    week: {
-      "days": {
-        "day1": false,
-        "day2": false,
-        "day3": false,
-        "day4": false,
-        "day5": false,
-        "day6": false,
-        "day7": false
-      }
-    }
-  }, p || {});
-}
-
-describe("<WeekRow/>", () => {
-  it("renders week 1 day numbers", () => {
-    const wrapper = render(<WeekRow {...weekProps() } />);
-    const txt = wrapper.text();
-    expect(txt).toEqual("Week 11234567");
-  });
-});
-
-describe("<WeekRow/>", () => {
-  it("renders week 2 day numbers", () => {
-    const wrapper = render(<WeekRow {...weekProps({ index: 1 }) } />);
-    const txt = wrapper.text();
-    expect(txt).toEqual("Week 2891011121314");
-  });
-});
diff --git a/frontend/regimens/bulk_scheduler/__tests__/actions_test.ts b/frontend/regimens/bulk_scheduler/__tests__/actions_test.ts
index 384afe09b..fa3895836 100644
--- a/frontend/regimens/bulk_scheduler/__tests__/actions_test.ts
+++ b/frontend/regimens/bulk_scheduler/__tests__/actions_test.ts
@@ -19,6 +19,7 @@ import { arrayUnwrap } from "../../../resources/util";
 import { overwrite } from "../../../api/crud";
 import { fakeVariableNameSet } from "../../../__test_support__/fake_variables";
 import { error, warning } from "../../../toast/toast";
+import { newWeek } from "../../reducer";
 
 const sequence_id = 23;
 const regimen_id = 32;
@@ -53,18 +54,9 @@ describe("commitBulkEditor()", () => {
     state.resources.consumers.regimens.currentRegimen = regimenUuid;
     state.resources.consumers.regimens.selectedSequenceUUID = sequenceUuid;
     state.resources.consumers.regimens.dailyOffsetMs = 2000;
-    state.resources.consumers.regimens.weeks = [{
-      days:
-      {
-        day1: true,
-        day2: false,
-        day3: false,
-        day4: false,
-        day5: false,
-        day6: false,
-        day7: false
-      }
-    }];
+    const week = newWeek();
+    week.days.day1 = true;
+    state.resources.consumers.regimens.weeks = [week];
     return state;
   }
 
diff --git a/frontend/regimens/bulk_scheduler/__tests__/group_regimen_items_by_week_test.ts b/frontend/regimens/bulk_scheduler/__tests__/group_regimen_items_by_week_test.ts
new file mode 100644
index 000000000..4812b0628
--- /dev/null
+++ b/frontend/regimens/bulk_scheduler/__tests__/group_regimen_items_by_week_test.ts
@@ -0,0 +1,36 @@
+import { groupRegimenItemsByWeek } from "../group_regimen_items_by_week";
+import { fakeSequence } from "../../../__test_support__/fake_state/resources";
+import { newWeek } from "../../reducer";
+
+describe("groupRegimenItemsByWeek()", () => {
+  it("groups regimen items by week", () => {
+    const sequence = fakeSequence();
+    sequence.body.id = 1;
+    const week1 = newWeek();
+    week1.days.day1 = true;
+    const week2 = newWeek();
+    const week3 = newWeek();
+    week3.days.day2 = true;
+    week3.days.day4 = true;
+    const { day1, day2, day3, day4, day5, day6, day7 } = week3.days;
+    week3.days = { day1, day4, day3, day2, day5, day6, day7 };
+    const weeks = [week1, week2, week3];
+    const result = groupRegimenItemsByWeek(weeks, 100, sequence.body);
+    expect(result).toEqual([
+      { time_offset: 100, sequence_id: 1 },
+      { time_offset: 1296000100, sequence_id: 1 },
+      { time_offset: 1468800100, sequence_id: 1 },
+    ]);
+  });
+
+  it("handles missing sequence id", () => {
+    const sequence = fakeSequence();
+    sequence.body.id = undefined;
+    const week = newWeek();
+    week.days.day1 = true;
+    const result = groupRegimenItemsByWeek([week], 0, sequence.body);
+    expect(result).toEqual([
+      { time_offset: 0, sequence_id: -1 },
+    ]);
+  });
+});
diff --git a/frontend/regimens/bulk_scheduler/__tests__/index_test.tsx b/frontend/regimens/bulk_scheduler/__tests__/index_test.tsx
index 7ab18f7f1..743778b2d 100644
--- a/frontend/regimens/bulk_scheduler/__tests__/index_test.tsx
+++ b/frontend/regimens/bulk_scheduler/__tests__/index_test.tsx
@@ -8,20 +8,12 @@ import {
 import { Actions } from "../../../constants";
 import { fakeSequence } from "../../../__test_support__/fake_state/resources";
 import { AddButton } from "../add_button";
+import { newWeek } from "../../reducer";
 
 describe("<BulkScheduler />", () => {
-  const weeks = [{
-    days:
-    {
-      day1: true,
-      day2: false,
-      day3: false,
-      day4: false,
-      day5: false,
-      day6: false,
-      day7: false
-    }
-  }];
+  const week = newWeek();
+  week.days.day1 = true;
+  const weeks = [week];
 
   function fakeProps(): BulkEditorProps {
     const sequence = fakeSequence();
diff --git a/frontend/regimens/bulk_scheduler/__tests__/week_grid_test.tsx b/frontend/regimens/bulk_scheduler/__tests__/week_grid_test.tsx
index 5b3abe037..4078f0f40 100644
--- a/frontend/regimens/bulk_scheduler/__tests__/week_grid_test.tsx
+++ b/frontend/regimens/bulk_scheduler/__tests__/week_grid_test.tsx
@@ -3,20 +3,12 @@ import { mount } from "enzyme";
 import { WeekGrid } from "../week_grid";
 import { WeekGridProps } from "../interfaces";
 import { Actions } from "../../../constants";
+import { newWeek } from "../../reducer";
 
 describe("<WeekGrid />", () => {
-  const weeks = [{
-    days:
-    {
-      day1: true,
-      day2: false,
-      day3: false,
-      day4: false,
-      day5: false,
-      day6: false,
-      day7: false
-    }
-  }];
+  const week = newWeek();
+  week.days.day1 = true;
+  const weeks = [week];
 
   it("renders", () => {
     const props: WeekGridProps = { weeks, dispatch: jest.fn() };
diff --git a/frontend/regimens/bulk_scheduler/__tests__/week_row_test.tsx b/frontend/regimens/bulk_scheduler/__tests__/week_row_test.tsx
new file mode 100644
index 000000000..bccd9d845
--- /dev/null
+++ b/frontend/regimens/bulk_scheduler/__tests__/week_row_test.tsx
@@ -0,0 +1,36 @@
+import * as React from "react";
+import { render, mount } from "enzyme";
+import { WeekRow } from "../week_row";
+import { WeekRowProps } from "../interfaces";
+import { betterMerge } from "../../../util";
+import { newWeek } from "../../reducer";
+import { Actions } from "../../../constants";
+
+describe("<WeekRow/>", () => {
+  const fakeProps = (p?: Partial<WeekRowProps>): WeekRowProps =>
+    betterMerge({
+      dispatch: jest.fn(),
+      index: 0,
+      week: newWeek()
+    }, p || {});
+
+  it("renders week 1 day numbers", () => {
+    const wrapper = render(<WeekRow {...fakeProps()} />);
+    expect(wrapper.text()).toEqual("Week 11234567");
+  });
+
+  it("renders week 2 day numbers", () => {
+    const wrapper = render(<WeekRow {...fakeProps({ index: 1 })} />);
+    expect(wrapper.text()).toEqual("Week 2891011121314");
+  });
+
+  it("selects day", () => {
+    const p = fakeProps();
+    const wrapper = mount(<WeekRow {...p} />);
+    wrapper.find("input").first().simulate("click");
+    expect(p.dispatch).toHaveBeenCalledWith({
+      type: Actions.TOGGLE_DAY,
+      payload: { week: 0, day: 1 },
+    });
+  });
+});
diff --git a/frontend/regimens/bulk_scheduler/week_row.tsx b/frontend/regimens/bulk_scheduler/week_row.tsx
index 9653e250d..3881c9119 100644
--- a/frontend/regimens/bulk_scheduler/week_row.tsx
+++ b/frontend/regimens/bulk_scheduler/week_row.tsx
@@ -6,17 +6,15 @@ import { t } from "../../i18next_wrapper";
 export function WeekRow({ index, dispatch, week }: WeekRowProps) {
   return <div className="week-row">
     <label className="week-label">{t("Week")} {index + 1}</label>
-    {
-      DAYS.map(function (day, i) {
-        const id = `${index}-${day}`;
-        return <Day day={i + 1}
-          week={index}
-          dispatch={dispatch}
-          id={id}
-          key={id}
-          active={week.days[day]} />;
-      })
-    }
+    {DAYS.map(function (day, i) {
+      const id = `${index}-${day}`;
+      return <Day day={i + 1}
+        week={index}
+        dispatch={dispatch}
+        id={id}
+        key={id}
+        active={week.days[day]} />;
+    })}
   </div>;
 }
 
diff --git a/frontend/regimens/reducer.ts b/frontend/regimens/reducer.ts
index 8802b9d17..0fe1501f5 100644
--- a/frontend/regimens/reducer.ts
+++ b/frontend/regimens/reducer.ts
@@ -12,7 +12,7 @@ export interface RegimenState {
   schedulerOpen: boolean;
 }
 
-function newWeek() {
+export function newWeek(): Week {
   return {
     days: {
       day1: false,