Getting different results depending on how test is run

[JeffML]

I have this set up before my mocha tests:

import chai from 'chai';
import chaiAlmost from 'chai-almost';

// some test values are approximately equal to spreadsheet values; see NOTE on materialsCost()
const TOLERANCE = 0.0501;          // +/- cents
chai.use(chaiAlmost(TOLERANCE));

chai.should();
describe("quantity 1000, 4x1, black & blue, adh free=2", function () {...

And later I have an assertion:

    it('displayPrice', done => {
        instance.displayPrice(fakeContext)
        props.should.have.property('displayPrice');
        props.displayPrice.should.almost.equal(1953.19); 
        console.log({displayPrice: props.displayPrice})
        done();
    })

When running the test singly, the output is:

{ displayPrice: 1953.24 }
✓ displayPrice

43 passing (326ms)

However, when run the whole series of 8 test files, I see this:
2) quantity 1000, 4x1, black & blue, adh free=2

   displayPrice:

  AssertionError: expected 1953.24 to almost equal 1953.19
  + expected - actual

  -1953.24
  +1953.19

Not sure how that is possible.

[JeffML]

Moved the console.log statement above the almost check and threw in TOLERANCE:

it('displayPrice', done => {
    instance.displayPrice(fakeContext)
    props.should.have.property('displayPrice');
    console.log({TOLERANCE, displayPrice: props.displayPrice})
    props.displayPrice.should.almost.equal(1953.19); 
    done();
})

The multi-file test run is now:

{ TOLERANCE: 0.0501, displayPrice: 1953.24 }
1) displayPrice
...

1. quantity 1000, 4x1, black & blue, adh free=2
   displayPrice:

   AssertionError: expected 1953.24 to almost equal 1953.19

   • expected - actual

   -1953.24
   +1953.19

Also, there was another failure just before this one, again related to tolerance, but it disappeared durin this test run.

[JeffML]

Refined this a bit further, and moved the console output to the actual failure output.

    const trace = {TOLERANCE, displayPrice: props.displayPrice}
    props.displayPrice.should.almost.equal(1953.19, JSON.stringify(trace));

seeing this now:

1. quantity 1000, 4x1, black & blue, adh free=2
   displayPrice:

   AssertionError: {"TOLERANCE":0.0501,"displayPrice":1953.24}: expected 1953.24 to almost equal 1953.19

   • expected - actual

   -1953.24
   +1953.19

[JeffML]

Okay, this seems to be related to the test file name. If I change it from this:
quantity1000_4x1_black-blue_adhfree2.js
to
testy.js

all tests pass, whether run solo or with others.

Could be a mocha issue.

[JeffML]

I take it back. Worked once, now failing again with file name change.