Add basic test coverage for viewport handling

frontend/src/AppState.test.ts

@@ -2,7 +2,7 @@ import { MediaSet } from './generated/media_set';
 import { stateReducer, State } from './AppState';
 import { from } from 'rxjs';
 import { PlayState } from './Player';
-import { CanvasWidth } from './HudCanvasState';
+import { CanvasWidth, SelectionMode } from './HudCanvasState';
 
 const initialState: State = {
   selection: { start: 0, end: 0 },
@@ -22,17 +22,17 @@ describe('stateReducer', () => {
   describe('mediasetloaded', () => {
     describe.each([
       {
-        name: 'with a normal length media set',
         audioFrames: 4410000,
         wantViewportFrames: 220500,
       },
       {
-        name: 'with a very short media set',
         audioFrames: 44100,
         wantViewportFrames: 2200,
       },
-    ])('mousedown', ({ name, audioFrames, wantViewportFrames }) => {
+    ])(
-      test(name, () => {
+      'mediaset with $audioFrames frames',
+      ({ audioFrames, wantViewportFrames }) => {
+        it('generates the expected state', () => {
           const mediaSet = MediaSet.fromPartial({
             id: '123',
             audioFrames: audioFrames,
@@ -45,6 +45,150 @@ describe('stateReducer', () => {
           expect(state.viewport.start).toEqual(0);
           expect(state.viewport.end).toEqual(wantViewportFrames);
         });
-    });
+      }
+    );
+  });
+
+  describe('setviewport', () => {
+    describe.each([
+      {
+        audioFrames: 441000,
+        viewport: { start: 0, end: 44100 },
+        selection: { start: 0, end: 0 },
+        wantViewportCanvas: { x1: 0, x2: 200 },
+        wantSelectionCanvas: { x1: 0, x2: 0 },
+      },
+      {
+        audioFrames: 441000,
+        viewport: { start: 0, end: 441000 },
+        selection: { start: 0, end: 0 },
+        wantViewportCanvas: { x1: 0, x2: 2000 },
+        wantSelectionCanvas: { x1: 0, x2: 0 },
+      },
+      {
+        audioFrames: 441000,
+        viewport: { start: 0, end: 441000 },
+        selection: { start: 0, end: 44100 },
+        wantViewportCanvas: { x1: 0, x2: 2000 },
+        wantSelectionCanvas: { x1: 0, x2: 200 },
+      },
+      {
+        audioFrames: 441000,
+        viewport: { start: 0, end: 22050 },
+        selection: { start: 0, end: 44100 },
+        wantViewportCanvas: { x1: 0, x2: 100 },
+        wantSelectionCanvas: { x1: 0, x2: 2000 },
+      },
+      {
+        audioFrames: 441000,
+        viewport: { start: 44100, end: 88200 },
+        selection: { start: 22050, end: 66150 },
+        wantViewportCanvas: { x1: 200, x2: 400 },
+        wantSelectionCanvas: { x1: 0, x2: 1000 },
+      },
+    ])(
+      'selection $selection.start-$selection.end, viewport: $viewport.start-$viewport.end',
+      ({
+        audioFrames,
+        viewport,
+        selection,
+        wantViewportCanvas,
+        wantSelectionCanvas,
+      }) => {
+        it('generates the expected state', () => {
+          const mediaSet = MediaSet.fromPartial({
+            id: '123',
+            audioFrames: audioFrames,
+          });
+          const state = stateReducer(
+            { ...initialState, mediaSet: mediaSet, selection: selection },
+            { type: 'setviewport', viewport: viewport }
+          );
+
+          expect(state.viewport).toEqual(viewport);
+          expect(state.selection).toEqual(selection);
+          expect(state.viewportCanvas).toEqual(wantViewportCanvas);
+          expect(state.selectionCanvas).toEqual(wantSelectionCanvas);
+        });
+      }
+    );
+  });
+
+  describe('viewportchanged', () => {
+    describe.each([
+      {
+        audioFrames: 441000,
+        event: {
+          mode: SelectionMode.Selecting,
+          prevMode: SelectionMode.Selecting,
+          selection: { x1: 0, x2: 200 },
+        },
+        selection: { start: 0, end: 0 },
+        wantViewport: { start: 0, end: 441000 },
+        wantSelectionCanvas: { x1: 0, x2: 0 },
+      },
+      {
+        audioFrames: 441000,
+        event: {
+          mode: SelectionMode.Normal,
+          prevMode: SelectionMode.Selecting,
+          selection: { x1: 0, x2: 200 },
+        },
+        selection: { start: 0, end: 0 },
+        wantViewport: { start: 0, end: 44100 },
+        wantSelectionCanvas: { x1: 0, x2: 0 },
+      },
+      {
+        audioFrames: 441000,
+        event: {
+          mode: SelectionMode.Normal,
+          prevMode: SelectionMode.Selecting,
+          selection: { x1: 0, x2: 200 },
+        },
+        selection: { start: 0, end: 22050 },
+        wantViewport: { start: 0, end: 44100 },
+        wantSelectionCanvas: { x1: 0, x2: 1000 },
+      },
+      {
+        audioFrames: 441000,
+        event: {
+          mode: SelectionMode.Normal,
+          prevMode: SelectionMode.Selecting,
+          selection: { x1: 1000, x2: 1500 },
+        },
+        selection: { start: 220500, end: 264600 },
+        wantViewport: { start: 220500, end: 330750 },
+        wantSelectionCanvas: { x1: 0, x2: 800 },
+      },
+    ])(
+      'mode $event.mode, audioFrames $audioFrames, canvas range $event.selection.x1-$event.selection.x2, selectedFrames $selection.start-$selection.end',
+      ({
+        audioFrames,
+        event,
+        selection,
+        wantViewport,
+        wantSelectionCanvas,
+      }) => {
+        it('generates the expected state', () => {
+          const mediaSet = MediaSet.fromPartial({
+            id: '123',
+            audioFrames: audioFrames,
+          });
+          const state = stateReducer(
+            {
+              ...initialState,
+              mediaSet: mediaSet,
+              viewport: { start: 0, end: audioFrames },
+              selection: selection,
+            },
+            { type: 'viewportchanged', event }
+          );
+
+          expect(state.selection).toEqual(selection);
+          expect(state.viewport).toEqual(wantViewport);
+          expect(state.selectionCanvas).toEqual(wantSelectionCanvas);
+        });
+      }
+    );
   });
 });