diff --git a/.gitignore b/.gitignore
index 41bfcd01..20cf3c43 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 .DS_Store
 node_modules
 .nyc_output
-coverage
\ No newline at end of file
+coverage
+tmp
diff --git a/test/integration.js b/test/integration.js
index 924db054..90a8b066 100644
--- a/test/integration.js
+++ b/test/integration.js
@@ -1,14 +1,16 @@
-/* global describe, beforeEach, it */
+/* global describe, before, beforeEach, it */
 
 const { spawnSync } = require('child_process')
 const c8Path = require.resolve('../bin/c8')
 const nodePath = process.execPath
 const chaiJestSnapshot = require('chai-jest-snapshot')
+const rimraf = require('rimraf')
 
 require('chai')
   .use(chaiJestSnapshot)
   .should()
 
+before(cb => rimraf('tmp', cb))
 beforeEach(function () { chaiJestSnapshot.configureUsingMochaContext(this) })
 
 describe('c8', () => {
@@ -16,6 +18,7 @@ describe('c8', () => {
     const { output } = spawnSync(nodePath, [
       c8Path,
       '--exclude="test/*.js"',
+      '--temp-directory=tmp/normal',
       '--clean=false',
       nodePath,
       require.resolve('./fixtures/normal')
@@ -27,6 +30,7 @@ describe('c8', () => {
     const { output } = spawnSync(nodePath, [
       c8Path,
       '--exclude="test/*.js"',
+      '--temp-directory=tmp/multiple-spawn',
       '--clean=false',
       nodePath,
       require.resolve('./fixtures/multiple-spawn')
@@ -38,6 +42,7 @@ describe('c8', () => {
     const { output } = spawnSync(nodePath, [
       c8Path,
       '--exclude="test/*.js"',
+      '--temp-directory=tmp/multiple-spawn-2',
       '--omit-relative=false',
       '--clean=false',
       nodePath,
@@ -49,35 +54,49 @@ describe('c8', () => {
   })
 
   describe('check-coverage', () => {
+    before(() => {
+      spawnSync(nodePath, [
+        c8Path,
+        '--exclude="test/*.js"',
+        '--temp-directory=tmp/check-coverage',
+        '--clean=false',
+        nodePath,
+        require.resolve('./fixtures/normal')
+      ])
+    })
+
     it('exits with 0 if coverage within threshold', () => {
       const { output, status } = spawnSync(nodePath, [
         c8Path,
         'check-coverage',
         '--exclude="test/*.js"',
+        '--temp-directory=tmp/check-coverage',
         '--lines=80'
       ])
       status.should.equal(0)
       output.toString('utf8').should.matchSnapshot()
     })
 
-    it('allows threshold to be applied on per-file basis', () => {
+    it('exits with 1 if coverage is below threshold', () => {
       const { output, status } = spawnSync(nodePath, [
         c8Path,
         'check-coverage',
         '--exclude="test/*.js"',
-        '--lines=80',
-        '--per-file'
+        '--temp-directory=tmp/check-coverage',
+        '--lines=101'
       ])
       status.should.equal(1)
       output.toString('utf8').should.matchSnapshot()
     })
 
-    it('exits with 1 if coverage is below threshold', () => {
+    it('allows threshold to be applied on per-file basis', () => {
       const { output, status } = spawnSync(nodePath, [
         c8Path,
         'check-coverage',
         '--exclude="test/*.js"',
-        '--lines=101'
+        '--temp-directory=tmp/check-coverage',
+        '--lines=101',
+        '--per-file'
       ])
       status.should.equal(1)
       output.toString('utf8').should.matchSnapshot()
@@ -88,6 +107,7 @@ describe('c8', () => {
         c8Path,
         '--exclude="test/*.js"',
         '--clean=false',
+        '--temp-directory=tmp/check-coverage',
         '--lines=101',
         '--check-coverage',
         nodePath,
@@ -99,11 +119,23 @@ describe('c8', () => {
   })
 
   describe('report', () => {
+    before(() => {
+      spawnSync(nodePath, [
+        c8Path,
+        '--exclude="test/*.js"',
+        '--temp-directory=tmp/report',
+        '--clean=false',
+        nodePath,
+        require.resolve('./fixtures/normal')
+      ])
+    })
+
     it('generates report from existing temporary files', () => {
       const { output } = spawnSync(nodePath, [
         c8Path,
         'report',
         '--exclude="test/*.js"',
+        '--temp-directory=tmp/report',
         '--clean=false'
       ])
       output.toString('utf8').should.matchSnapshot()
@@ -116,6 +148,7 @@ describe('c8', () => {
         '--check-coverage',
         '--lines=101',
         '--exclude="test/*.js"',
+        '--temp-directory=tmp/report',
         '--clean=false'
       ])
       status.should.equal(1)
@@ -129,6 +162,7 @@ describe('c8', () => {
         c8Path,
         '--exclude="test/*.js"',
         '--clean=false',
+        '--temp-directory=tmp/esm',
         nodePath,
         '--experimental-modules',
         '--no-warnings',
diff --git a/test/integration.js.snap b/test/integration.js.snap
index f21cf160..e4bc5bf5 100644
--- a/test/integration.js.snap
+++ b/test/integration.js.snap
@@ -2,26 +2,13 @@
 
 exports[`c8 ESM Modules collects coverage for ESM modules 1`] = `
 ",bar
---------------------|----------|----------|----------|----------|-------------------|
-File                |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
---------------------|----------|----------|----------|----------|-------------------|
-All files           |     96.2 |    86.49 |    90.32 |     96.2 |                   |
- bin                |    91.18 |    83.33 |      100 |    91.18 |                   |
-  c8.js             |    91.18 |    83.33 |      100 |    91.18 |          25,26,27 |
- lib                |    97.51 |    82.35 |      100 |    97.51 |                   |
-  parse-args.js     |    98.46 |       60 |      100 |    98.46 |           107,108 |
-  report.js         |    96.69 |    91.67 |      100 |    96.69 |... 10,136,137,138 |
- lib/commands       |      100 |    88.89 |      100 |      100 |                   |
-  check-coverage.js |      100 |    92.31 |      100 |      100 |                17 |
-  report.js         |      100 |       80 |      100 |      100 |                16 |
- test/fixtures      |    89.04 |    93.75 |       70 |    89.04 |                   |
-  async.js          |      100 |      100 |      100 |      100 |                   |
-  export.mjs        |    71.43 |      100 |       50 |    71.43 |               2,3 |
-  import.mjs        |      100 |      100 |      100 |      100 |                   |
-  multiple-spawn.js |      100 |      100 |      100 |      100 |                   |
-  normal.js         |       75 |    66.67 |    33.33 |       75 | 14,15,16,18,19,20 |
-  subprocess.js     |      100 |      100 |      100 |      100 |                   |
---------------------|----------|----------|----------|----------|-------------------|
+------------|----------|----------|----------|----------|-------------------|
+File        |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
+------------|----------|----------|----------|----------|-------------------|
+All files   |       80 |      100 |       50 |       80 |                   |
+ export.mjs |    71.43 |      100 |       50 |    71.43 |               2,3 |
+ import.mjs |      100 |      100 |      100 |      100 |                   |
+------------|----------|----------|----------|----------|-------------------|
 ,"
 `;
 
@@ -34,38 +21,27 @@ what
 hey
 what
 hey
---------------------|----------|----------|----------|----------|-------------------|
-File                |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
---------------------|----------|----------|----------|----------|-------------------|
-All files           |    96.12 |    82.09 |    89.66 |    96.12 |                   |
- bin                |    91.18 |       80 |      100 |    91.18 |                   |
-  c8.js             |    91.18 |       80 |      100 |    91.18 |          25,26,27 |
- lib                |    97.51 |    78.13 |      100 |    97.51 |                   |
-  parse-args.js     |    98.46 |       60 |      100 |    98.46 |           107,108 |
-  report.js         |    96.69 |    86.36 |      100 |    96.69 |... 10,136,137,138 |
- lib/commands       |    97.67 |    82.35 |     87.5 |    97.67 |                   |
-  check-coverage.js |      100 |    92.31 |      100 |      100 |                17 |
-  report.js         |    92.31 |       50 |       50 |    92.31 |              9,10 |
- test/fixtures      |    90.48 |    92.31 |       75 |    90.48 |                   |
-  async.js          |      100 |      100 |      100 |      100 |                   |
-  multiple-spawn.js |      100 |      100 |      100 |      100 |                   |
-  normal.js         |       75 |    66.67 |    33.33 |       75 | 14,15,16,18,19,20 |
-  subprocess.js     |      100 |      100 |      100 |      100 |                   |
---------------------|----------|----------|----------|----------|-------------------|
-,ERROR: Coverage for lines (96.12%) does not meet global threshold (101%)
+-----------|----------|----------|----------|----------|-------------------|
+File       |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
+-----------|----------|----------|----------|----------|-------------------|
+All files  |    83.33 |    85.71 |    66.67 |    83.33 |                   |
+ async.js  |      100 |      100 |      100 |      100 |                   |
+ normal.js |       75 |    66.67 |    33.33 |       75 | 14,15,16,18,19,20 |
+-----------|----------|----------|----------|----------|-------------------|
+,ERROR: Coverage for lines (83.33%) does not meet global threshold (101%)
 "
 `;
 
 exports[`c8 check-coverage allows threshold to be applied on per-file basis 1`] = `
-",,ERROR: Coverage for lines (78.33%) does not meet threshold (80%) for lib/commands/check-coverage.js
-ERROR: Coverage for lines (75%) does not meet threshold (80%) for test/fixtures/normal.js
+",,ERROR: Coverage for lines (100%) does not meet threshold (101%) for test/fixtures/async.js
+ERROR: Coverage for lines (75%) does not meet threshold (101%) for test/fixtures/normal.js
 "
 `;
 
 exports[`c8 check-coverage exits with 0 if coverage within threshold 1`] = `",,"`;
 
 exports[`c8 check-coverage exits with 1 if coverage is below threshold 1`] = `
-",,ERROR: Coverage for lines (95.69%) does not meet global threshold (101%)
+",,ERROR: Coverage for lines (83.33%) does not meet global threshold (101%)
 "
 `;
 
@@ -74,69 +50,36 @@ exports[`c8 merges reports from subprocesses together 1`] = `
 
 second
 
---------------------|----------|----------|----------|----------|-------------------|
-File                |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
---------------------|----------|----------|----------|----------|-------------------|
-All files           |    84.91 |       72 |    74.07 |    84.91 |                   |
- bin                |    88.24 |       60 |      100 |    88.24 |                   |
-  c8.js             |    88.24 |       60 |      100 |    88.24 |       22,25,26,27 |
- lib                |    96.09 |    66.67 |      100 |    96.09 |                   |
-  parse-args.js     |    96.92 |    44.44 |      100 |    96.92 |     93,94,107,108 |
-  report.js         |    95.36 |    77.78 |      100 |    95.36 |... 10,136,137,138 |
- lib/commands       |    43.02 |       60 |    16.67 |    43.02 |                   |
-  check-coverage.js |    21.67 |      100 |        0 |    21.67 |... 56,57,58,59,60 |
-  report.js         |    92.31 |       50 |       50 |    92.31 |              9,10 |
- test/fixtures      |    90.48 |    92.31 |       75 |    90.48 |                   |
-  async.js          |      100 |      100 |      100 |      100 |                   |
-  multiple-spawn.js |      100 |      100 |      100 |      100 |                   |
-  normal.js         |       75 |    66.67 |    33.33 |       75 | 14,15,16,18,19,20 |
-  subprocess.js     |      100 |      100 |      100 |      100 |                   |
---------------------|----------|----------|----------|----------|-------------------|
+-------------------|----------|----------|----------|----------|-------------------|
+File               |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
+-------------------|----------|----------|----------|----------|-------------------|
+All files          |      100 |      100 |      100 |      100 |                   |
+ multiple-spawn.js |      100 |      100 |      100 |      100 |                   |
+ subprocess.js     |      100 |      100 |      100 |      100 |                   |
+-------------------|----------|----------|----------|----------|-------------------|
 ,"
 `;
 
 exports[`c8 report generates report from existing temporary files 1`] = `
-",--------------------|----------|----------|----------|----------|-------------------|
-File                |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
---------------------|----------|----------|----------|----------|-------------------|
-All files           |    96.12 |    85.51 |    89.66 |    96.12 |                   |
- bin                |    91.18 |    83.33 |      100 |    91.18 |                   |
-  c8.js             |    91.18 |    83.33 |      100 |    91.18 |          25,26,27 |
- lib                |    97.51 |    82.35 |      100 |    97.51 |                   |
-  parse-args.js     |    98.46 |       60 |      100 |    98.46 |           107,108 |
-  report.js         |    96.69 |    91.67 |      100 |    96.69 |... 10,136,137,138 |
- lib/commands       |    97.67 |     87.5 |     87.5 |    97.67 |                   |
-  check-coverage.js |      100 |    91.67 |      100 |      100 |                17 |
-  report.js         |    92.31 |       75 |       50 |    92.31 |              9,10 |
- test/fixtures      |    90.48 |    92.31 |       75 |    90.48 |                   |
-  async.js          |      100 |      100 |      100 |      100 |                   |
-  multiple-spawn.js |      100 |      100 |      100 |      100 |                   |
-  normal.js         |       75 |    66.67 |    33.33 |       75 | 14,15,16,18,19,20 |
-  subprocess.js     |      100 |      100 |      100 |      100 |                   |
---------------------|----------|----------|----------|----------|-------------------|
+",-----------|----------|----------|----------|----------|-------------------|
+File       |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
+-----------|----------|----------|----------|----------|-------------------|
+All files  |    83.33 |    85.71 |    66.67 |    83.33 |                   |
+ async.js  |      100 |      100 |      100 |      100 |                   |
+ normal.js |       75 |    66.67 |    33.33 |       75 | 14,15,16,18,19,20 |
+-----------|----------|----------|----------|----------|-------------------|
 ,"
 `;
 
 exports[`c8 report supports --check-coverage, when generating reports 1`] = `
-",--------------------|----------|----------|----------|----------|-------------------|
-File                |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
---------------------|----------|----------|----------|----------|-------------------|
-All files           |    96.55 |    85.51 |     93.1 |    96.55 |                   |
- bin                |    91.18 |       80 |      100 |    91.18 |                   |
-  c8.js             |    91.18 |       80 |      100 |    91.18 |          25,26,27 |
- lib                |    97.51 |    82.35 |      100 |    97.51 |                   |
-  parse-args.js     |    98.46 |       60 |      100 |    98.46 |           107,108 |
-  report.js         |    96.69 |    91.67 |      100 |    96.69 |... 10,136,137,138 |
- lib/commands       |      100 |    88.24 |      100 |      100 |                   |
-  check-coverage.js |      100 |    91.67 |      100 |      100 |                17 |
-  report.js         |      100 |       80 |      100 |      100 |                16 |
- test/fixtures      |    90.48 |    92.31 |       75 |    90.48 |                   |
-  async.js          |      100 |      100 |      100 |      100 |                   |
-  multiple-spawn.js |      100 |      100 |      100 |      100 |                   |
-  normal.js         |       75 |    66.67 |    33.33 |       75 | 14,15,16,18,19,20 |
-  subprocess.js     |      100 |      100 |      100 |      100 |                   |
---------------------|----------|----------|----------|----------|-------------------|
-,ERROR: Coverage for lines (96.55%) does not meet global threshold (101%)
+",-----------|----------|----------|----------|----------|-------------------|
+File       |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
+-----------|----------|----------|----------|----------|-------------------|
+All files  |    83.33 |    85.71 |    66.67 |    83.33 |                   |
+ async.js  |      100 |      100 |      100 |      100 |                   |
+ normal.js |       75 |    66.67 |    33.33 |       75 | 14,15,16,18,19,20 |
+-----------|----------|----------|----------|----------|-------------------|
+,ERROR: Coverage for lines (83.33%) does not meet global threshold (101%)
 "
 `;