wip: ability to choose snapshot file per test case

packages/snapshot/src/client.ts

@@ -1,7 +1,7 @@
 import type { RawSnapshotInfo } from './port/rawSnapshot'
 import type { SnapshotResult, SnapshotStateOptions } from './types'
 import SnapshotState from './port/state'
-import { deepMergeSnapshot } from './port/utils'
+import { deepMergeSnapshot, DefaultMap } from './port/utils'
 
 function createMismatchError(
   message: string,
@@ -75,6 +75,27 @@ export class SnapshotClient {
     return result
   }
 
+  private fileToTestIds = new DefaultMap<string, Set<string>>(() => new Set())
+  private testIdToSnapshotPath: Record<string, string> = {}
+  private snapshotPathToState = new Map<string, SnapshotState>()
+
+  async setupTest(
+    filepath: string,
+    testId: string,
+    options: SnapshotStateOptions,
+  ): Promise<void> {
+    this.fileToTestIds.get(filepath).add(testId)
+    const snapshotPath = await options.snapshotEnvironment.resolvePath(filepath)
+    this.testIdToSnapshotPath[testId] = snapshotPath
+    if (!this.snapshotPathToState.has(snapshotPath)) {
+      const content = await options.snapshotEnvironment.readSnapshotFile(snapshotPath)
+      this.snapshotPathToState.set(
+        snapshotPath,
+        new SnapshotState(filepath, snapshotPath, content, options),
+      )
+    }
+  }
+
   skipTest(filepath: string, testName: string): void {
     const state = this.getSnapshotState(filepath)
     state.markSnapshotsAsCheckedForTest(testName)

packages/snapshot/src/port/state.ts

@@ -68,7 +68,7 @@ export default class SnapshotState {
   private updated = new CounterMap<string>()
   expand: boolean
 
-  private constructor(
+  constructor(
     public testFilePath: string,
     public snapshotPath: string,
     snapshotContent: string | null,