[Bug] coverage reports Unknown% with --watch

[baslr]

🐛 Bug Report

To Reproduce

Steps to reproduce the behavior:

repo https://github.com/baslr/node-template

When I add a test and try jest with --watch, --watchAll on macOS and WSL: Debian I get:

git diff src/
diff --git a/src/__tests__/app.test.mjs b/src/__tests__/app.test.mjs
index 5be908d..a4a1646 100755
--- a/src/__tests__/app.test.mjs
+++ b/src/__tests__/app.test.mjs
@@ -14,4 +14,9 @@ describe('test app', () => {
         const ret = square(3, 3);
         expect(ret).toBe(36);
     });
+
+    test('test two', () => {
+        const ret = square(3, 3);
+        expect(ret).toBe(36);
+    });




npx jest --watch
PASS src/__tests__/app.test.mjs
  test app
    ✓ test mul (1ms)
    ✓ test suqare (1ms)
    ✓ test foo
    ✓ test two (1ms)

----------|---------|----------|---------|---------|-------------------
File      | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s 
----------|---------|----------|---------|---------|-------------------
All files |       0 |        0 |       0 |       0 |                   
----------|---------|----------|---------|---------|-------------------

=============================== Coverage summary ===============================
Statements   : Unknown% ( 0/0 )
Branches     : Unknown% ( 0/0 )
Functions    : Unknown% ( 0/0 )
Lines        : Unknown% ( 0/0 )
================================================================================
Test Suites: 1 passed, 1 total
Tests:       4 passed, 4 total
Snapshots:   0 total
Time:        1.024s
Ran all test suites related to changed files.




npx jest --watchAll
PASS src/__tests__/app.test.mjs
  test app
    ✓ test mul (2ms)
    ✓ test suqare (1ms)
    ✓ test foo
    ✓ test two

----------|---------|----------|---------|---------|-------------------
File      | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s 
----------|---------|----------|---------|---------|-------------------
All files |     100 |      100 |     100 |     100 |                   
 app.mjs  |     100 |      100 |     100 |     100 |                   
----------|---------|----------|---------|---------|-------------------

=============================== Coverage summary ===============================
Statements   : 100% ( 6/6 )
Branches     : 100% ( 0/0 )
Functions    : 100% ( 2/2 )
Lines        : 100% ( 5/5 )
================================================================================
Test Suites: 1 passed, 1 total
Tests:       4 passed, 4 total
Snapshots:   0 total
Time:        1.115s
Ran all test suites.




npx jest --watch --coverage
PASS src/__tests__/app.test.mjs
  test app
    ✓ test mul (2ms)
    ✓ test suqare
    ✓ test foo (1ms)
    ✓ test two

----------|---------|----------|---------|---------|-------------------
File      | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s 
----------|---------|----------|---------|---------|-------------------
All files |       0 |        0 |       0 |       0 |                   
----------|---------|----------|---------|---------|-------------------

=============================== Coverage summary ===============================
Statements   : Unknown% ( 0/0 )
Branches     : Unknown% ( 0/0 )
Functions    : Unknown% ( 0/0 )
Lines        : Unknown% ( 0/0 )
================================================================================
Test Suites: 1 passed, 1 total
Tests:       4 passed, 4 total
Snapshots:   0 total
Time:        1.003s
Ran all test suites related to changed files.




npx jest --watchAll --coverage
PASS src/__tests__/app.test.mjs
  test app
    ✓ test mul (2ms)
    ✓ test suqare
    ✓ test foo
    ✓ test two

----------|---------|----------|---------|---------|-------------------
File      | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s 
----------|---------|----------|---------|---------|-------------------
All files |     100 |      100 |     100 |     100 |                   
 app.mjs  |     100 |      100 |     100 |     100 |                   
----------|---------|----------|---------|---------|-------------------

=============================== Coverage summary ===============================
Statements   : 100% ( 6/6 )
Branches     : 100% ( 0/0 )
Functions    : 100% ( 2/2 )
Lines        : 100% ( 5/5 )
================================================================================
Test Suites: 1 passed, 1 total
Tests:       4 passed, 4 total
Snapshots:   0 total
Time:        1.025s
Ran all test suites.

Expected behavior

=============================== Coverage summary ===============================
Statements   : Unknown% ( 0/0 )
Branches     : Unknown% ( 0/0 )
Functions    : Unknown% ( 0/0 )
Lines        : Unknown% ( 0/0 )
================================================================================

should not be Unknown%

Link to repl

https://github.com/baslr/node-template

envinfo

WSL: Debian, macOS 10.12.6 both with Node.js v12.14.1

related to jest-community/vscode-jest#551

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