optimize message

Author: F3n67u

e2e/__tests__/selectProjects.test.ts

@@ -187,10 +187,52 @@ describe('Given a config with two named projects, first-project and second-proje
     it('fails', () => {
       expect(result).toHaveProperty('failed', true);
     });
-    // FIXME(F3n67u)
     it.skip('prints that no project was found', () => {
       expect(result.stdout).toMatch(
-        /^You provided values for --selectProjects but no projects were found matching the selection/,
+        /^You provided values for --ignoreProjects, but no projects were found matching the selection/,
+      );
+    });
+  });
+
+  describe('when Jest is started with `--selectProjects first-project second-project --ignoreProjects first-project` ', () => {
+    let result: RunJestJsonResult;
+    beforeAll(() => {
+      result = runWithJson('select-projects', [
+        '--selectProjects',
+        'first-project',
+        'second-project',
+        '--ignoreProjects',
+        'first-project',
+      ]);
+    });
+    it('runs the tests in the second project only', () => {
+      expect(result.json).toHaveProperty('success', true);
+      expect(result.json).toHaveProperty('numTotalTests', 1);
+      expect(result.json.testResults.map(({name}) => name)).toEqual([
+        resolve(dir, '__tests__/second-project.test.js'),
+      ]);
+    });
+    it('prints that only second-project will run', () => {
+      expect(result.stderr).toMatch(/^Running one project: second-project/);
+    });
+  });
+
+  describe('when Jest is started with `--selectProjects first-project --ignoreProjects first-project` ', () => {
+    let result: RunJestResult;
+    beforeAll(() => {
+      result = run('select-projects', [
+        '--selectProjects',
+        'first-project',
+        '--ignoreProjects',
+        'first-project',
+      ]);
+    });
+    it('fails', () => {
+      expect(result).toHaveProperty('failed', true);
+    });
+    it.skip('prints that no project was found', () => {
+      expect(result.stdout).toMatch(
+        /^You provided values for --selectProjects and --ignoreProjects, but no projects were found matching the selection./,
       );
     });
   });

packages/jest-core/src/cli/index.ts

@@ -83,7 +83,12 @@ export async function runCLI(
     if (namesMissingWarning) {
       outputStream.write(namesMissingWarning);
     }
-    outputStream.write(getSelectProjectsMessage(configsOfProjectsToRun));
+    outputStream.write(
+      getSelectProjectsMessage(configsOfProjectsToRun, {
+        ignoreProjects: argv.ignoreProjects,
+        selectProjects: argv.selectProjects,
+      }),
+    );
   }
 
   await _run10000(

packages/jest-core/src/getSelectProjectsMessage.ts

@@ -11,17 +11,38 @@ import getProjectDisplayName from './getProjectDisplayName';
 
 export default function getSelectProjectsMessage(
   projectConfigs: Array<Config.ProjectConfig>,
+  opts: {
+    ignoreProjects: Array<string> | undefined;
+    selectProjects: Array<string> | undefined;
+  },
 ): string {
   if (projectConfigs.length === 0) {
-    return getNoSelectionWarning();
+    return getNoSelectionWarning(opts);
   }
   return getProjectsRunningMessage(projectConfigs);
 }
 
-function getNoSelectionWarning(): string {
-  return chalk.yellow(
-    'You provided values for --selectProjects but no projects were found matching the selection.\n',
-  );
+function getNoSelectionWarning(opts: {
+  ignoreProjects: Array<string> | undefined;
+  selectProjects: Array<string> | undefined;
+}): string {
+  if (opts.ignoreProjects && opts.selectProjects) {
+    return chalk.yellow(
+      'You provided values for --selectProjects and --ignoreProjects, but no projects were found matching the selection.\n' +
+        'Are you ignoring all the selected projects?\n',
+    );
+  } else if (opts.ignoreProjects) {
+    return chalk.yellow(
+      'You provided values for --ignoreProjects, but no projects were found matching the selection.\n' +
+        'Are you ignoring all projects?\n',
+    );
+  } else if (opts.selectProjects) {
+    return chalk.yellow(
+      'You provided values for --selectProjects but no projects were found matching the selection.\n',
+    );
+  } else {
+    return chalk.yellow('No projects were found.\n');
+  }
 }
 
 function getProjectsRunningMessage(