testing: fix case sensitivity in file coverage (#200666)

File Explorer does not show the coverage bar
Fixes #200604

Author: connor4312

src/vs/workbench/api/browser/mainThreadTesting.ts

@@ -136,7 +136,7 @@ export class MainThreadTesting extends Disposable implements MainThreadTestingSh
 
 			const fn = available ? ((token: CancellationToken) => TestCoverage.load(taskId, {
 				provideFileCoverage: async token => await this.proxy.$provideFileCoverage(runId, taskId, token)
-					.then(c => c.map(IFileCoverage.deserialize)),
+					.then(c => c.map(u => IFileCoverage.deserialize(this.uriIdentityService, u))),
 				resolveFileCoverage: (i, token) => this.proxy.$resolveFileCoverage(runId, taskId, i, token)
 					.then(d => d.map(CoverageDetails.deserialize)),
 			}, token)) : undefined;

src/vs/workbench/contrib/testing/common/testCoverageService.ts

@@ -85,7 +85,7 @@ export class TestCoverageService extends Disposable implements ITestCoverageServ
 			this._isOpenKey.set(true);
 		} catch (e) {
 			if (!cts.token.isCancellationRequested) {
-				this.notificationService.error(localize('testCoverageError', 'Failed to load test coverage: {}', String(e)));
+				this.notificationService.error(localize('testCoverageError', 'Failed to load test coverage: {0}', String(e)));
 			}
 			return;
 		}

src/vs/workbench/contrib/testing/common/testTypes.ts

@@ -571,12 +571,12 @@ export namespace IFileCoverage {
 		uri: original.uri.toJSON(),
 	});
 
-	export const deserialize = (serialized: Serialized): IFileCoverage => ({
+	export const deserialize = (uriIdentity: ITestUriCanonicalizer, serialized: Serialized): IFileCoverage => ({
 		statement: serialized.statement,
 		branch: serialized.branch,
 		function: serialized.function,
 		details: serialized.details?.map(CoverageDetails.deserialize),
-		uri: URI.from(serialized.uri),
+		uri: uriIdentity.asCanonicalUri(URI.revive(serialized.uri)),
 	});
 }