test:coverage, add coverage report script

[msimerson]

output looks like this:

ipaddr.js ➜ npm run test:coverage

> ipaddr.js@2.4.0 test:coverage
> node --test --experimental-test-coverage

▶ ipaddr
  ✔ should define main classes (1.097125ms)
  ✔ can construct IPv4 from octets (0.105708ms)
  ✔ refuses to construct invalid IPv4 (0.101292ms)
  ✔ converts IPv4 to string correctly (0.065459ms)
  ✔ converts IPv4 CIDR to string correctly (0.297208ms)
  ✔ returns correct kind for IPv4 (0.040792ms)
  ✔ allows to access IPv4 octets (0.033208ms)
  ✔ checks IPv4 address format (0.204833ms)
  ✔ validates IPv4 addresses (0.208917ms)
  ✔ validates IPv4 addresses in CIDR notation (0.075084ms)
  ✔ parses IPv4 in several weird formats (0.453667ms)
  ✔ barfs at invalid IPv4 (0.081584ms)
  ✔ matches IPv4 CIDR correctly (0.083708ms)
  ✔ parses CIDR reversible (0.6325ms)
  ✔ parses IPv4 CIDR correctly (0.096792ms)
  ✔ detects reserved IPv4 networks (0.123916ms)
  ✔ checks the conventional IPv4 address format (0.069792ms)
  ✔ checks the conventional IPv4 CIDR format (0.056709ms)
  ✔ refuses to construct IPv4 address with trailing and leading zeros (0.050291ms)
  ✔ can construct IPv6 from 16bit parts (0.026417ms)
  ✔ can construct IPv6 from 8bit parts (0.039208ms)
  ✔ refuses to construct invalid IPv6 (0.063041ms)
  ✔ converts IPv6 to string correctly (0.09875ms)
  ✔ converts IPv6 CIDR to string correctly (0.062417ms)
  ✔ converts IPv6 to RFC 5952 string correctly (0.068083ms)
  ✔ returns IPv6 zoneIndex (0.08825ms)
  ✔ returns IPv6 zoneIndex for IPv4-mapped IPv6 addresses (0.167291ms)
  ✔ returns correct kind for IPv6 (0.028166ms)
  ✔ allows to access IPv6 address parts (0.022ms)
  ✔ checks IPv6 address format (0.055ms)
  ✔ validates IPv6 addresses (0.189875ms)
  ✔ validates IPv6 addresses in CIDR notation (0.127084ms)
  ✔ parses IPv6 in different formats (0.078ms)
  ✔ barfs at invalid IPv6 (0.042959ms)
  ✔ matches IPv6 CIDR correctly (0.076416ms)
  ✔ parses IPv6 CIDR correctly (0.098708ms)
  ✔ converts between IPv4-mapped IPv6 addresses and IPv4 addresses (0.074292ms)
  ✔ refuses to convert non-IPv4-mapped IPv6 address to IPv4 address (0.046292ms)
  ✔ detects reserved IPv6 networks (0.226041ms)
  ✔ is able to determine IP address type (0.052458ms)
  ✔ throws an error if tried to parse an invalid address (0.072833ms)
  ✔ correctly processes IPv4-mapped addresses (0.085417ms)
  ✔ correctly converts IPv6 and IPv4 addresses to byte arrays (0.058709ms)
  ✔ correctly parses 1 as an IPv4 address (0.031083ms)
  ✔ correctly detects IPv4 and IPv6 CIDR addresses (0.055375ms)
  ✔ does not consider a very large or very small number a valid IP address (0.051333ms)
  ✔ does not hang on ::8:8:8:8:8:8:8:8:8 (0.050625ms)
  ✔ subnetMatch does not fail on empty range (0.032ms)
  ✔ subnetMatch returns default subnet on empty range (0.024666ms)
  ✔ subnetMatch does not fail on IPv4 when looking for IPv6 (0.02975ms)
  ✔ subnetMatch does not fail on IPv6 when looking for IPv4 (0.037667ms)
  ✔ subnetMatch can use a hybrid IPv4/IPv6 range list (0.049917ms)
  ✔ is able to determine IP address type from byte array input (0.049417ms)
  ✔ prefixLengthFromSubnetMask returns proper CIDR notation for standard IPv4 masks (0.179083ms)
  ✔ prefixLengthFromSubnetMask returns proper CIDR notation for standard IPv6 masks (0.105625ms)
  ✔ subnetMaskFromPrefixLength returns correct IPv4 subnet mask given prefix length (0.113792ms)
  ✔ subnetMaskFromPrefixLength returns correct IPv6 subnet mask given prefix length (0.079459ms)
  ✔ broadcastAddressFromCIDR returns correct IPv4 broadcast address (0.062ms)
  ✔ networkAddressFromCIDR returns correct IPv4 network address (0.0595ms)
  ✔ networkAddressFromCIDR returns correct IPv6 network address (0.117125ms)
  ✔ broadcastAddressFromCIDR returns correct IPv6 broadcast address (0.096333ms)
✔ ipaddr (7.990833ms)
ℹ tests 61
ℹ suites 1
ℹ pass 61
ℹ fail 0
ℹ cancelled 0
ℹ skipped 0
ℹ todo 0
ℹ duration_ms 62.808875
ℹ start of coverage report
ℹ ---------------------------------------------------------------------------------------------------------------------
ℹ file         | line % | branch % | funcs % | uncovered lines
ℹ ---------------------------------------------------------------------------------------------------------------------
ℹ lib          |        |          |         | 
ℹ  ipaddr.js   |  97.32 |    94.09 |   98.44 | 109-110 237-238 330-331 397-398 511-512 635-636 726-727 821-822 853-85…
ℹ ---------------------------------------------------------------------------------------------------------------------
ℹ all files    |  97.32 |    94.09 |   98.44 | 
ℹ ---------------------------------------------------------------------------------------------------------------------
ℹ end of coverage report