diff --git a/test/fixtures/ca-bundle.crt b/test/fixtures/ca-bundle.crt
deleted file mode 100644
index fb1dea98a7..0000000000
--- a/test/fixtures/ca-bundle.crt
+++ /dev/null
@@ -1,40 +0,0 @@
------BEGIN CERTIFICATE-----
-MIIDJjCCAg4CAhnOMA0GCSqGSIb3DQEBBQUAMH0xCzAJBgNVBAYTAlVTMQswCQYD
-VQQIDAJDQTEWMBQGA1UEBwwNU2FuIEZyYW5jaXNjbzEZMBcGA1UECgwQU3Ryb25n
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-na4fY1gf3zTHxH8259b/TOOaPfTnCEsOQtjUrWNR4xhmVZ+HJy4yytUW
------END CERTIFICATE-----
------BEGIN CERTIFICATE-----
-MIIDbzCCAlcCAmm6MA0GCSqGSIb3DQEBCwUAMH0xCzAJBgNVBAYTAlVTMQswCQYD
-VQQIDAJDQTEWMBQGA1UEBwwNU2FuIEZyYW5jaXNjbzEZMBcGA1UECgwQU3Ryb25n
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-uGZtfEvhbNm6m2i4UNmpCXxUZQ==
------END CERTIFICATE-----
diff --git a/test/fixtures/ca.crt b/test/fixtures/ca.crt
deleted file mode 100644
index aaf97575b1..0000000000
--- a/test/fixtures/ca.crt
+++ /dev/null
@@ -1,21 +0,0 @@
------BEGIN CERTIFICATE-----
-MIIDZDCCAkwCCQCAzfCLqrJvuTANBgkqhkiG9w0BAQsFADB0MQswCQYDVQQGEwJV
-UzELMAkGA1UECAwCQ0ExEDAOBgNVBAoMB05vZGUuanMxETAPBgNVBAsMCG5vZGUt
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-rceJuGsnJEQ=
------END CERTIFICATE-----
diff --git a/test/fixtures/certs.js b/test/fixtures/certs.js
new file mode 100644
index 0000000000..766e54b5ed
--- /dev/null
+++ b/test/fixtures/certs.js
@@ -0,0 +1,150 @@
+module.exports['ca.key'] = `
+-----BEGIN RSA PRIVATE KEY-----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+nFjxhp+nn7qY9yu0kajoKk1xchct337J0Qv2nv5+DjdKrArzqT7MPaDXKFfhy5s7
+mdO5tr/XZp50rCnws/d8iDmmtLjB2EHxSw10avmg1B1p+UTa1F8pEuOMVt529r1j
+9zYoCFo02c8j8PEnoeQWcQKBgQCVBCuQZu5SSM/zTkTTnU0sy0lf1qflI9IMD92B
++JVqg8HDnAR0KF+x38a9MVP7ixgXCuy19t+XxfY269HmLjTlArWV671D4GCSPRGy
+plwZ6nr72ieCo3y57+q94jxL3jh3+bozlpnUG/q6tTKBLGs7JDjsWDSsuxOu8tO6
+RBttXQKBgB6LQFOTjDMfsFHKsnQXFUZId3GG/iLg3WCWxEo88T5Rq3JIR0zDpW8H
+cKhl/sPY+JVHsxizNCMPtp7Hn7GrB6D/v9LbO0jpG2U0BFiJ6zhiDopbP9B0EAW4
+5JJ+JGKRKoCxs3DmSVyns0gU4j4rVte97UWyVy5TZ8Acr/qrgOA1
+-----END RSA PRIVATE KEY-----
+`
+
+module.exports['ca.crt'] = `
+-----BEGIN CERTIFICATE-----
+MIIDmzCCAoOgAwIBAgIUDA0GrvcnG41XT6LYFeNwvq8YV1UwDQYJKoZIhvcNAQEL
+BQAwXTELMAkGA1UEBhMCVVMxCzAJBgNVBAgMAkNBMRAwDgYDVQQKDAdOb2RlLmpz
+MREwDwYDVQQLDAhub2RlLWd5cDEcMBoGA1UEAwwTbm9kZS1neXAubm9kZWpzLm9y
+ZzAeFw0yMjA1MTEwNDIyMjRaFw00OTA5MjUwNDIyMjRaMF0xCzAJBgNVBAYTAlVT
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+eXAxHDAaBgNVBAMME25vZGUtZ3lwLm5vZGVqcy5vcmcwggEiMA0GCSqGSIb3DQEB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+GbN8uKxIfyMjqZKaujPR
+-----END CERTIFICATE-----
+`
+
+module.exports['server.key'] = `
+-----BEGIN RSA PRIVATE KEY-----
+MIIEpAIBAAKCAQEAvPM99BkYrBcTM355dhz4XzhSDRGxa9qttUlBSgEsbu2UjsRm
+XjDS+60XXd66tWpPwLeUd2uvlC/ltv5ekv+EBu35j1KfA1+K1rtFzb1i40kMCsns
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+mAbNVLez0D5/ja9r/WTVgW9hXFDLF/iVvS4TE/SGrj2WzYF35RsPbVmUDIrwpsBX
+/EfsQaA/JCn8VIBTkR31Bg4QLBjAfijMY22MaHgZIXv83lF1SE2o1ATKpCHqzFx9
+K8vK9e22PZUJPGaOhqjEA13TAoGAEPipSJFw38/6NmInfkjd84EFxmkAoBI5k/vV
+36aOoyl7s40MTYEPXavCF3fLPVfuwUXhmKUcbkiXhlIX4De3y15e1n66fjDc8EVY
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+6o4kN0P5F+DVU2SP6fo9zKLCxaTH9VAQ9C3VUViGAFLBt4DVDmj77g==
+-----END RSA PRIVATE KEY-----
+`
+
+module.exports['server.crt'] = `
+-----BEGIN CERTIFICATE-----
+MIIDNzCCAh8CFBg1Ph5t5rBlAbCrEn/PexNy9WunMA0GCSqGSIb3DQEBCwUAMF0x
+CzAJBgNVBAYTAlVTMQswCQYDVQQIDAJDQTEQMA4GA1UECgwHTm9kZS5qczERMA8G
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+Ra2UZ6mauRlOeqdHb+HZKrFYYUOtd1HOWWJ44Gaya2EQMiTbd/Ns9Th2KTbTOCbL
+CHFNska9Ty2ioT7VcrVuIEXFPMua5T4lnCkNJQla800pHHOak2baN/c66Io+8XI2
+xiqaVrLT3qvpzdiiEjo4POeRnWMIgJJshy77Am5JlhaJiAqP1AHfh/tYpliGkjXF
+8DSgSoLHSQfalJ4VQvP4XLc/XnmF5Zt6bvwUxCllEBFRneU74bW7/euYX/TpYobr
+Y+YM7fGiCqwHdUs=
+-----END CERTIFICATE-----
+`
+
+module.exports['ca-bundle.crt'] = `
+-----BEGIN CERTIFICATE-----
+MIIDJjCCAg4CAhnOMA0GCSqGSIb3DQEBBQUAMH0xCzAJBgNVBAYTAlVTMQswCQYD
+VQQIDAJDQTEWMBQGA1UEBwwNU2FuIEZyYW5jaXNjbzEZMBcGA1UECgwQU3Ryb25n
+TG9vcCwgSW5jLjESMBAGA1UECwwJU3Ryb25nT3BzMRowGAYDVQQDDBFjYS5zdHJv
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+cPsGhH71WDuUEEflvZihf2Se2x+xgZtMhc5XGmVmRuZFYKvkgUhA2/w8/QrK+jPT
+n9QRJxZjWNh2RBdC1B7u4jffSmOSUljYFH1I2eTeY+Rdi6YUIYSU9gEoZxsv3Tia
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+jJjg2aifD1S187dHm+Il4qZNO2plWwAhN0h704f+8wpsaALxUvBIu6nvlvcMP5PH
+jGN5JLe2Km3UaPvYOQU2SgacLilu+uBcIo2JSHLV6O7ziqUj5Gior6YxDLCtEZie
+Ea8aX5/YjuACtEMJ1JjRqjgkM66XAoUe0E8onOK3FgTIO3tGoTJwRp0zS50pFuP0
+PsZtT04ck6mmXEXXknNoAyBCvPypfms9OHqcUIW9fiQnrGbS/Ri4QSQYj0DtFk/1
+na4fY1gf3zTHxH8259b/TOOaPfTnCEsOQtjUrWNR4xhmVZ+HJy4yytUW
+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
+`
diff --git a/test/fixtures/server.crt b/test/fixtures/server.crt
deleted file mode 100644
index 5d0c440e07..0000000000
--- a/test/fixtures/server.crt
+++ /dev/null
@@ -1,21 +0,0 @@
------BEGIN CERTIFICATE-----
-MIIDYjCCAkoCCQCSlmGR7KzZGTANBgkqhkiG9w0BAQsFADB0MQswCQYDVQQGEwJV
-UzELMAkGA1UECAwCQ0ExEDAOBgNVBAoMB05vZGUuanMxETAPBgNVBAsMCG5vZGUt
-Z3lwMRIwEAYDVQQDDAlsb2NhbGhvc3QxHzAdBgkqhkiG9w0BCQEWEGJ1aWxkQG5v
-ZGVqcy5vcmcwHhcNMTkwNjIyMDYyNTU1WhcNMjkwNjE5MDYyNTU1WjByMQswCQYD
-VQQGEwJVUzELMAkGA1UECAwCQ0ExEDAOBgNVBAoMB05vZGUuanMxETAPBgNVBAsM
-CG5vZGUtZ3lwMRIwEAYDVQQDDAlsb2NhbGhvc3QxHTAbBgkqhkiG9w0BCQEWDmJ1
-aWxkQGlvanMub3JnMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA6S1E
-2WchgmbJYqCnpN7310ZgHjIOqeJe6MpSue2u6z6mTNd5izgvQNaANmn3xLFCS5zs
-uZaTvdPYPkcmSQzb1YcZSUYnAxZifjYARc6kb5GSBl3q+O70ELyFrimXfZ4JI+bd
-IG9KiHY17DlvZZZj/csGYVWWg0mkeH3O5LPX6/DXQVh/9+gZ02/cdIBCAtZHQwqx
-7tF/qZA/kD4GZNFpU1DYHzf9H6g9htoCqmNHQWrV2T9yFybt6mbZp9kglBmyKYCc
-7hmQnb7N/mHn1yIuwhBsirCJTfKH86gN81u8M3+SVHA2VUHDllcNhpDWlmInXA+I
-tHdGZHCp95ohqpCPgQIDAQABMA0GCSqGSIb3DQEBCwUAA4IBAQCdvYj6CD0ZLwT2
-3t1r+deC3TJuHlNVSeKeT7wIfFnh2FW5riGV0q/w6eXPLTHjuiS6YmpAAbdNUgX/
-sq64FqI2RLpX6pgY5yB0SKopMcJxMLKqmF4zHpIHxtYN5EmN3PR0vehneBR/nZ2T
-3ikvWD5JeXlm7Dfw+tjijdxM/sEoDWErGup4mMKMd1s5s830p+ITJUa50d0DLFdH
-mqPSbUZF8mMPwGJd+nu1Ht3gTLtK7+gYJgGtXMJmGC0Qg77EJHDB2NbotgDGNmSU
-1H9BpAeFHHIcbh2Rr7kkTvnh/c03vFe+CsDZmezcmRpRzW1fKj3YbfqBxU4XwJrL
-a5T/N9xU
------END CERTIFICATE-----
diff --git a/test/fixtures/server.key b/test/fixtures/server.key
deleted file mode 100644
index a8447391e0..0000000000
--- a/test/fixtures/server.key
+++ /dev/null
@@ -1,27 +0,0 @@
------BEGIN RSA PRIVATE KEY-----
-MIIEowIBAAKCAQEA6S1E2WchgmbJYqCnpN7310ZgHjIOqeJe6MpSue2u6z6mTNd5
-izgvQNaANmn3xLFCS5zsuZaTvdPYPkcmSQzb1YcZSUYnAxZifjYARc6kb5GSBl3q
-+O70ELyFrimXfZ4JI+bdIG9KiHY17DlvZZZj/csGYVWWg0mkeH3O5LPX6/DXQVh/
-9+gZ02/cdIBCAtZHQwqx7tF/qZA/kD4GZNFpU1DYHzf9H6g9htoCqmNHQWrV2T9y
-Fybt6mbZp9kglBmyKYCc7hmQnb7N/mHn1yIuwhBsirCJTfKH86gN81u8M3+SVHA2
-VUHDllcNhpDWlmInXA+ItHdGZHCp95ohqpCPgQIDAQABAoIBABW8R4ewalo6dJlB
-+n6O3jFt+PW3mtBRLqGqgm2cb0q0a1IMX+MPWLBFjmwEErl+AH0F4rcmBx2Ryr17
-amEy1qcf0caXyHksNAApznqzWXag7iizxnxv4cZRnHBwphNqkNWM5p3oYd04j6w2
-amDg1O9KZozaKo6QZclpiMiezwjKG+PVZLT8p7afswjv+yDWPDByhlcGiye9QD1T
-VuZ0QCoXp6N/8JxW0gdkLp9NqFvGeGFzJ5h6L+d7A6BWw8akXrBRHHcKkyvVYBfd
-myhSzSK4FPFMaxaEY/65FlVSyAO6ezGm3Umx4g7mkFjLdwKWaIOjkBkPeFgl3Pp4
-7Lo5X3UCgYEA/FrrIwmEU5ayulBVScEMKeavu5eNY4r0Sqbpov2oyTdYe8G49Pzy
-ryMXfunY43moLKpajGwgTKRGvdqFtK08AAkaCssiAPkP3rZuZvMTF4sLo/vlWrjP
-3er+tUqj22BzXi5XV0BAvH8Y3TL8KQ3he/8JxDvkC811/DQ9Y/Da3U8CgYEA7Itw
-UM37URma08Bj9VTMoL9ZCyURewX+ZLDb2+O8sXGXJs28i1RkE6PTBlnRmedn+Jjk
-byzQ5Cs5wA5uMbhYTA7kgXOs1bvgQqmlLmyL6FfHkucoMhr2Di7VeGf4OxE26JZ8
-JdY4+1MOyI3A2rR8WU+GmHxy0ay4K2xe6W0vsi8CgYBoGLEKIPDe8jkDtgOYivOT
-jT9MaLXALB+dc8DIpU4swpHTaxP6qyUIrbcReTEolJSU6Ci16BxiwRkVU8D3yMYJ
-VbfSX/zE3fh37FUaToa/nXHN0SjJBZdpeXhcHE//PIgaf48zxKNvnhYJmPB/luQ+
-m/PRaMsnOzfCM2JniYEe7QKBgGwjnxhB4tgDtaWCue/pcZc3gzS2IJS2e8N6mzie
-l6Ajhu+FdOHZldrotUuc+la61OxwsVYmDeWR4VftAPGYDj3PPSX1RRl9R5wSRGLB
-2wBASQvew6CMdNqtDIh8N56BUzHnwh/mHKzBHuwO6hDSHFsUITtLAY7bwGKRq55Z
-fUmfAoGBANOYFyoJoDLcl+Jd750lyqfCifcGtkRdmZMtrPXaYnD8ZGme9vz1vsK/
-4iUkV3mi7Z9s1LXMa/tPPfKdVhCM1PXost3/si0+u1Bz5yKqEPXlyy2ltpIVyGu8
-yiy7y75asp8Iii/1cgtwyp9+VeSif8wJ+MHQoGdGxvAQP80R3EjF
------END RSA PRIVATE KEY-----
diff --git a/test/test-download.js b/test/test-download.js
index 71a3c0d092..c4caad9e83 100644
--- a/test/test-download.js
+++ b/test/test-download.js
@@ -12,6 +12,7 @@ const devDir = require('./common').devDir()
 const rimraf = require('rimraf')
 const gyp = require('../lib/node-gyp')
 const log = require('npmlog')
+const certs = require('./fixtures/certs')
 
 log.level = 'warn'
 
@@ -40,12 +41,12 @@ test('download over http', async (t) => {
 test('download over https with custom ca', async (t) => {
   t.plan(3)
 
-  const cafile = path.join(__dirname, '/fixtures/ca.crt')
-  const [cert, key, ca] = await Promise.all([
-    fs.promises.readFile(path.join(__dirname, 'fixtures/server.crt'), 'utf8'),
-    fs.promises.readFile(path.join(__dirname, 'fixtures/server.key'), 'utf8'),
-    install.test.readCAFile(cafile)
-  ])
+  const cafile = path.join(__dirname, 'fixtures/ca.crt')
+  const cacontents = certs['ca.crt']
+  const cert = certs['server.crt']
+  const key = certs['server.key']
+  await fs.promises.writeFile(cafile, cacontents, 'utf8')
+  const ca = await install.test.readCAFile(cafile)
 
   t.strictEqual(ca.length, 1)
 
@@ -55,7 +56,10 @@ test('download over https with custom ca', async (t) => {
     res.end('ok')
   })
 
-  t.tearDown(() => new Promise((resolve) => server.close(resolve)))
+  t.tearDown(async () => {
+    await new Promise((resolve) => server.close(resolve))
+    await fs.promises.unlink(cafile)
+  })
 
   server.on('clientError', (err) => { throw err })
 
@@ -150,6 +154,12 @@ test('download with missing cafile', async (t) => {
 })
 
 test('check certificate splitting', async (t) => {
+  const cafile = path.join(__dirname, 'fixtures/ca-bundle.crt')
+  const cacontents = certs['ca-bundle.crt']
+  await fs.promises.writeFile(cafile, cacontents, 'utf8')
+  t.tearDown(async () => {
+    await fs.promises.unlink(cafile)
+  })
   const cas = await install.test.readCAFile(path.join(__dirname, 'fixtures/ca-bundle.crt'))
   t.plan(2)
   t.strictEqual(cas.length, 2)