travis: add testing

.travis.yml

@@ -0,0 +1,37 @@
+sudo: false
+
+language: go
+
+# Do not move these lines; they are referred to by README.md.
+# Versions of go that are explicitly supported by gonum plus go tip.
+go:
+ - 1.8.x
+ - 1.9.x
+ - 1.10.x
+ - master
+
+matrix:
+ fast_finish: true
+ allow_failures:
+   - go: master
+
+before_install:
+ # Required for format check.
+ - go get golang.org/x/tools/cmd/goimports
+ # Required for coverage.
+ - go get golang.org/x/tools/cmd/cover
+ - go get github.com/mattn/goveralls
+
+go_import_path: gonum.org/v1/tools
+
+# Get deps, build, test, and ensure the code is gofmt'ed.
+# If we are building as gonum, then we have access to the coveralls api key, so we can run coverage as well.
+script:
+ - ${TRAVIS_BUILD_DIR}/.travis/check-formatting.sh
+ - go get -d -t -v ./...
+ - go build -v ./...
+ - if [[ $TRAVIS_SECURE_ENV_VARS = "true" ]]; then bash ./.travis/test-coverage.sh; fi
+ - ${TRAVIS_BUILD_DIR}/.travis/check-imports.sh
+ # This is run last since it alters the tree.
+ - ${TRAVIS_BUILD_DIR}/.travis/check-generate.sh
+

.travis/check-formatting.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+test -z "$(goimports -d .)"
+if [[ -n "$(gofmt -s -l .)" ]]; then
+	echo -e '\e[31mCode not gofmt simplified in:\n\n'
+	gofmt -s -l .
+	echo -e "\e[0"
+fi

.travis/check-generate.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+# Add any go generate invocations below this line.
+
+
+if [ -n "$(git diff)" ]; then
+	git diff
+	exit 1
+fi

.travis/check-imports.sh

@@ -0,0 +1,4 @@
+#!/bin/bash
+
+set -e
+check-imports -b "math/rand,github.com/gonum/.*"

.travis/test-coverage.sh

@@ -0,0 +1,34 @@
+#!/bin/bash
+
+PROFILE_OUT=$PWD/profile.out
+ACC_OUT=$PWD/acc.out
+
+testCover() {
+	# set the return value to 0 (succesful)
+	retval=0
+	# get the directory to check from the parameter. Default to '.'
+	d=${1:-.}
+	# skip if there are no Go files here
+	ls $d/*.go &> /dev/null || return $retval
+	# switch to the directory to check
+	pushd $d > /dev/null
+	# create the coverage profile
+	coverageresult=`go test -v $TAGS -coverprofile=$PROFILE_OUT`
+	# output the result so we can check the shell output
+	echo ${coverageresult}
+	# append the results to acc.out if coverage didn't fail, else set the retval to 1 (failed)
+	( [[ ${coverageresult} == *FAIL* ]] && retval=1 ) || ( [ -f $PROFILE_OUT ] && grep -v "mode: set" $PROFILE_OUT >> $ACC_OUT )
+	# return to our working dir
+	popd > /dev/null
+	# return our return value
+	return $retval
+}
+
+# Init acc.out
+echo "mode: set" > $ACC_OUT
+
+# Run test coverage on all directories containing go files.
+find . -type d | while read d; do testCover $d || exit; done
+
+# Upload the coverage profile to coveralls.io
+[ -n "$COVERALLS_TOKEN" ] && goveralls -coverprofile=$ACC_OUT -service=travis-ci -repotoken $COVERALLS_TOKEN

README.md

@@ -9,6 +9,10 @@ Installation is done using `go get`.
 go get -u gonum.org/v1/tools/...
 ```
 
+## Supported Go versions
+
+Gonum supports and tests on the [three most recent major versions of Go](https://github.com/gonum/tools/blob/master/.travis.yml#L6-L11).
+
 ## Issues
 
 If you find any bugs, feel free to file an issue on the github issue tracker. Discussions on API changes, added features, code review, or similar requests are preferred on the gonum-dev Google Group.