chore(ecs): describe job and generate run task request from job workload

.github/CODEOWNERS

@@ -1,3 +1,5 @@
 # @See https://help.github.com/articles/about-codeowners/
 
-* @aws/aws-ecs-devx
+* @aws/aws-ecs-devx
+
+*.ja.md @toricls

Makefile

@@ -172,6 +172,7 @@ gen-mocks: tools
 	${GOBIN}/mockgen -package=mocks -destination=./internal/pkg/aws/cloudformation/mocks/mock_cloudformation.go -source=./internal/pkg/aws/cloudformation/interfaces.go
 	${GOBIN}/mockgen -package=mocks -destination=./internal/pkg/aws/cloudformation/stackset/mocks/mock_stackset.go -source=./internal/pkg/aws/cloudformation/stackset/stackset.go
 	${GOBIN}/mockgen -package=mocks -destination=./internal/pkg/aws/ssm/mocks/mock_ssm.go -source=./internal/pkg/aws/ssm/ssm.go
+	${GOBIN}/mockgen -package=mocks -destination=./internal/pkg/aws/stepfunctions/mocks/mock_stepfunctions.go -source=./internal/pkg/aws/stepfunctions/stepfunctions.go
 	${GOBIN}/mockgen -package=mocks -destination=./internal/pkg/addon/mocks/mock_addons.go -source=./internal/pkg/addon/addons.go
 	${GOBIN}/mockgen -package=exec -source=./internal/pkg/exec/exec.go -destination=./internal/pkg/exec/mock_exec.go
 	${GOBIN}/mockgen -package=mocks -destination=./internal/pkg/deploy/mocks/mock_deploy.go -source=./internal/pkg/deploy/deploy.go

go.mod

@@ -5,23 +5,22 @@ go 1.15
 require (
 	github.com/AlecAivazis/survey/v2 v2.2.12
 	github.com/Netflix/go-expect v0.0.0-20190729225929-0e00d9168667 // indirect
-	github.com/aws/aws-sdk-go v1.38.30
+	github.com/aws/aws-sdk-go v1.38.36
 	github.com/briandowns/spinner v1.12.0
 	github.com/dustin/go-humanize v1.0.0
 	github.com/fatih/color v1.10.0
 	github.com/fatih/structs v1.1.0
 	github.com/gobuffalo/packd v1.0.0
 	github.com/gobuffalo/packr/v2 v2.8.1
 	github.com/golang/mock v1.5.0
-	github.com/google/go-cmp v0.5.1 // indirect
 	github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510
 	github.com/google/uuid v1.2.0
 	github.com/hinshun/vt10x v0.0.0-20180809195222-d55458df857c // indirect
 	github.com/imdario/mergo v0.3.9
 	github.com/lnquy/cron v1.1.1
 	github.com/moby/buildkit v0.8.3
-	github.com/onsi/ginkgo v1.16.1
-	github.com/onsi/gomega v1.11.0
+	github.com/onsi/ginkgo v1.16.2
+	github.com/onsi/gomega v1.12.0
 	github.com/robfig/cron/v3 v3.0.1
 	github.com/rogpeppe/go-internal v1.6.1 // indirect
 	github.com/spf13/afero v1.6.0

go.sum

@@ -143,8 +143,8 @@ github.com/aws/aws-sdk-go v1.20.6/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN
 github.com/aws/aws-sdk-go v1.25.11/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
 github.com/aws/aws-sdk-go v1.27.1/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
 github.com/aws/aws-sdk-go v1.31.6/go.mod h1:5zCpMtNQVjRREroY7sYe8lOMRSxkhG6MZveU8YkpAk0=
-github.com/aws/aws-sdk-go v1.38.30 h1:X+JDSwkpSQfoLqH4fBLmS0rou8W/cdCCCD5lntTk9Vs=
-github.com/aws/aws-sdk-go v1.38.30/go.mod h1:hcU610XS61/+aQV88ixoOzUoG7v3b31pl2zKMmprdro=
+github.com/aws/aws-sdk-go v1.38.36 h1:MiqzQY/IOFTX/jmGse7ThafD0eyOC4TrCLv2KY1v+bI=
+github.com/aws/aws-sdk-go v1.38.36/go.mod h1:hcU610XS61/+aQV88ixoOzUoG7v3b31pl2zKMmprdro=
 github.com/aybabtme/rgbterm v0.0.0-20170906152045-cc83f3b3ce59/go.mod h1:q/89r3U2H7sSsE2t6Kca0lfwTK8JdoNGS/yzM/4iH5I=
 github.com/beorn7/perks v0.0.0-20160804104726-4c0e84591b9a/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
@@ -384,8 +384,9 @@ github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:W
 github.com/golang/protobuf v1.4.0/go.mod h1:jodUvKwWbYaEsadDk5Fwe5c77LiNKVO9IDvqG2KuDX0=
 github.com/golang/protobuf v1.4.1/go.mod h1:U8fpvMrcmy5pZrNK1lt4xCsGvpyWQ/VVv6QDs8UjoX8=
 github.com/golang/protobuf v1.4.2/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI=
-github.com/golang/protobuf v1.4.3 h1:JjCZWpVbqXDqFVmTfYWEVTMIYrL/NPdPSCHPJ0T/raM=
-github.com/golang/protobuf v1.4.3/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI=
+github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
+github.com/golang/protobuf v1.5.2 h1:ROPKBNFfQgOUMifHyP+KYbvpjbdoFNs+aK7DXlji0Tw=
+github.com/golang/protobuf v1.5.2/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
 github.com/golang/snappy v0.0.0-20180518054509-2e65f85255db/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
 github.com/golangci/check v0.0.0-20180506172741-cfe4005ccda2/go.mod h1:k9Qvh+8juN+UKMCS/3jFtGICgW8O96FVaZsaxdzDkR4=
 github.com/golangci/dupl v0.0.0-20180902072040-3e9179ac440a/go.mod h1:ryS0uhF+x9jgbj/N71xsEqODy9BN81/GonCZiOzirOk=
@@ -415,8 +416,8 @@ github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMyw
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.4.1/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/go-cmp v0.5.1 h1:JFrFEBb2xKufg6XkJsJr+WbKb4FQlURi5RUcBveYu9k=
-github.com/google/go-cmp v0.5.1/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.5 h1:Khx7svrCpmxxtHBq5j2mp/xVjsi8hQMfNLvJFAlrGgU=
+github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-containerregistry v0.0.0-20191010200024-a3d713f9b7f8/go.mod h1:KyKXa9ciM8+lgMXwOVsXi7UxGrsf9mM61Mzs+xKUrKE=
 github.com/google/go-containerregistry v0.1.2/go.mod h1:GPivBPgdAyd2SU+vf6EpsgOtWDuPqjW0hJZt4rNdTZ4=
 github.com/google/go-github v17.0.0+incompatible/go.mod h1:zLgOLi98H3fifZn+44m+umXrS52loVEgC2AApnigrVQ=
@@ -686,8 +687,8 @@ github.com/onsi/ginkgo v1.10.3/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+
 github.com/onsi/ginkgo v1.11.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
 github.com/onsi/ginkgo v1.12.0/go.mod h1:oUhWkIvk5aDxtKvDDuw8gItl8pKl42LzjC9KZE0HfGg=
 github.com/onsi/ginkgo v1.12.1/go.mod h1:zj2OWP4+oCPe1qIXoGWkgMRwljMUYCdkwsT2108oapk=
-github.com/onsi/ginkgo v1.16.1 h1:foqVmeWDD6yYpK+Yz3fHyNIxFYNxswxqNFjSKe+vI54=
-github.com/onsi/ginkgo v1.16.1/go.mod h1:CObGmKUOKaSC0RjmoAK7tKyn4Azo5P2IWuoMnvwxz1E=
+github.com/onsi/ginkgo v1.16.2 h1:HFB2fbVIlhIfCfOW81bZFbiC/RvnpXSdhbF2/DJr134=
+github.com/onsi/ginkgo v1.16.2/go.mod h1:CObGmKUOKaSC0RjmoAK7tKyn4Azo5P2IWuoMnvwxz1E=
 github.com/onsi/gomega v0.0.0-20170829124025-dcabb60a477c/go.mod h1:C1qb7wdrVGGVU+Z6iS04AVkA3Q65CEZX59MT0QO5uiA=
 github.com/onsi/gomega v1.4.3/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY=
 github.com/onsi/gomega v1.5.0/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY=
@@ -696,8 +697,8 @@ github.com/onsi/gomega v1.7.1/go.mod h1:XdKZgCCFLUoM/7CFJVPcG8C1xQ1AJ0vpAezJrB7J
 github.com/onsi/gomega v1.8.1/go.mod h1:Ho0h+IUsWyvy1OpqCwxlQ/21gkhVunqlU8fDGcoTdcA=
 github.com/onsi/gomega v1.9.0/go.mod h1:Ho0h+IUsWyvy1OpqCwxlQ/21gkhVunqlU8fDGcoTdcA=
 github.com/onsi/gomega v1.10.1/go.mod h1:iN09h71vgCQne3DLsj+A5owkum+a2tYe+TOCB1ybHNo=
-github.com/onsi/gomega v1.11.0 h1:+CqWgvj0OZycCaqclBD1pxKHAU+tOkHmQIWvDHq2aug=
-github.com/onsi/gomega v1.11.0/go.mod h1:azGKhqFUon9Vuj0YmTfLSmx0FUwqXYSTl5re8lQLTUg=
+github.com/onsi/gomega v1.12.0 h1:p4oGGk2M2UJc0wWN4lHFvIB71lxsh0T/UiKCCgFADY8=
+github.com/onsi/gomega v1.12.0/go.mod h1:lRk9szgn8TxENtWd0Tp4c3wjlRfMTMH27I+3Je41yGY=
 github.com/op/go-logging v0.0.0-20160315200505-970db520ece7/go.mod h1:HzydrMdWErDVzsI23lYNej1Htcns9BCg93Dk0bBINWk=
 github.com/opencontainers/go-digest v0.0.0-20170106003457-a6d0ee40d420/go.mod h1:cMLVZDEM3+U2I4VmLI6N8jQYUd2OVphdqWwCJHrFt2s=
 github.com/opencontainers/go-digest v0.0.0-20180430190053-c9281466c8b2/go.mod h1:cMLVZDEM3+U2I4VmLI6N8jQYUd2OVphdqWwCJHrFt2s=
@@ -1038,8 +1039,8 @@ golang.org/x/net v0.0.0-20200625001655-4c5254603344/go.mod h1:/O7V0waA8r7cgGh81R
 golang.org/x/net v0.0.0-20200707034311-ab3426394381/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
 golang.org/x/net v0.0.0-20201021035429-f5854403a974/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
 golang.org/x/net v0.0.0-20201110031124-69a78807bb2b/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
-golang.org/x/net v0.0.0-20201202161906-c7110b5ffcbb h1:eBmm0M9fYhWpKZLjQUUKka/LtIxf46G4fxeEz5KJr9U=
-golang.org/x/net v0.0.0-20201202161906-c7110b5ffcbb/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
+golang.org/x/net v0.0.0-20210428140749-89ef3d95e781 h1:DzZ89McO9/gWPsQXS/FVKAlG02ZjaQ6AlZRBimEYOd0=
+golang.org/x/net v0.0.0-20210428140749-89ef3d95e781/go.mod h1:OJAsFXCWl8Ukc7SiCT/9KSuxbyM7479/AVlXFRxuMCk=
 golang.org/x/oauth2 v0.0.0-20180724155351-3d292e4d0cdc/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20181017192945-9dcd33a902f4/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
@@ -1127,17 +1128,21 @@ golang.org/x/sys v0.0.0-20200916030750-2334cc1a136f/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200917073148-efd3b9a0ff20/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201013081832-0aaa2718063a/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210112080510-489259a85091 h1:DMyOG0U+gKfu8JZzg2UQe9MeaC1X+xQWlAKcRnjxjCw=
+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210112080510-489259a85091/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/term v0.0.0-20201117132131-f5c789dd3221 h1:/ZHdbVpdR/jk3g30/d4yUL0JU9kksj8+F/bnQUVLGDM=
+golang.org/x/sys v0.0.0-20210423082822-04245dca01da h1:b3NXsE2LusjYGGjL5bxEVZZORm/YEFFrWFjR8eFrw/c=
+golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1 h1:v+OssWQX+hTHEmOBgwxdZxK4zHq3yOs8F9J7mk0PY8E=
+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/text v0.0.0-20160726164857-2910a502d2bf/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
-golang.org/x/text v0.3.3 h1:cokOdA+Jmi5PJGXLlLllQSgYigAEfHXJAERHVMaCc2k=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.3.6 h1:aRYxNxv6iGQlyVaZmk6ZgYEDa+Jg18DxebPSrd6bg1M=
+golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/time v0.0.0-20180412165947-fbb02b2291d2/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
@@ -1309,8 +1314,10 @@ google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzi
 google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.24.0 h1:UhZDfRO8JRQru4/+LlLE0BRKGF8L+PICnvYZmx/fEGA=
 google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGjtUeSXeh4=
+google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
+google.golang.org/protobuf v1.26.0 h1:bxAC2xTBsZGibn2RTntX0oH50xLsqy1OxA9tTL3p/lk=
+google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
 gopkg.in/airbrake/gobrake.v2 v2.0.9/go.mod h1:/h5ZAUhDkGaJfjzjKLSjv6zCL6O0LLBxU4K+aSYdM/U=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=

internal/pkg/aws/resourcegroups/resourcegroups.go

@@ -13,6 +13,10 @@ import (
 	"github.com/aws/aws-sdk-go/service/resourcegroupstaggingapi"
 )
 
+const (
+	ResourceTypeStateMachine = "states:stateMachine"
+)
+
 type api interface {
 	GetResources(input *resourcegroupstaggingapi.GetResourcesInput) (*resourcegroupstaggingapi.GetResourcesOutput, error)
 }

internal/pkg/aws/stepfunctions/stepfunctions.go

@@ -0,0 +1,41 @@
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+// Package stepfunctions provides a client to make API requests to Amazon Step Functions.
+package stepfunctions
+
+import (
+	"fmt"
+
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/session"
+	"github.com/aws/aws-sdk-go/service/sfn"
+)
+
+type api interface {
+	DescribeStateMachine(input *sfn.DescribeStateMachineInput) (*sfn.DescribeStateMachineOutput, error)
+}
+
+// StepFunctions wraps an AWS StepFunctions client.
+type StepFunctions struct {
+	client api
+}
+
+// New returns StepFunctions configured against the input session.
+func New(s *session.Session) *StepFunctions {
+	return &StepFunctions{
+		client: sfn.New(s),
+	}
+}
+
+// StateMachineDefinition returns the JSON-based state machine definition.
+func (s *StepFunctions) StateMachineDefinition(stateMachineARN string) (string, error) {
+	out, err := s.client.DescribeStateMachine(&sfn.DescribeStateMachineInput{
+		StateMachineArn: aws.String(stateMachineARN),
+	})
+	if err != nil {
+		return "", fmt.Errorf("describe state machine: %w", err)
+	}
+
+	return aws.StringValue(out.Definition), nil
+}

internal/pkg/aws/stepfunctions/stepfunctions_test.go

@@ -0,0 +1,70 @@
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+// Package stepfunctions provides a client to make API requests to Amazon Step Functions.
+package stepfunctions
+
+import (
+	"errors"
+	"testing"
+
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/service/sfn"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/aws/copilot-cli/internal/pkg/aws/stepfunctions/mocks"
+	"github.com/golang/mock/gomock"
+)
+
+func TestStepFunctions_StateMachineDefinition(t *testing.T) {
+	testCases := map[string]struct {
+		inStateMachineARN string
+
+		mockStepFunctionsClient func(m *mocks.Mockapi)
+
+		wantedError      error
+		wantedDefinition string
+	}{
+		"fail to describe state machine": {
+			inStateMachineARN: "ninth inning",
+			mockStepFunctionsClient: func(m *mocks.Mockapi) {
+				m.EXPECT().DescribeStateMachine(&sfn.DescribeStateMachineInput{
+					StateMachineArn: aws.String("ninth inning"),
+				}).Return(nil, errors.New("some error"))
+			},
+			wantedError: errors.New("describe state machine: some error"),
+		},
+		"success": {
+			inStateMachineARN: "ninth inning",
+			mockStepFunctionsClient: func(m *mocks.Mockapi) {
+				m.EXPECT().DescribeStateMachine(&sfn.DescribeStateMachineInput{
+					StateMachineArn: aws.String("ninth inning"),
+				}).Return(&sfn.DescribeStateMachineOutput{
+					Definition: aws.String("{\n  \"Version\": \"42\",\n  \"Comment\": \"very important comment\"\n}"),
+				}, nil)
+			},
+			wantedDefinition: "{\n  \"Version\": \"42\",\n  \"Comment\": \"very important comment\"\n}",
+		},
+	}
+
+	for name, tc := range testCases {
+		t.Run(name, func(t *testing.T) {
+			ctrl := gomock.NewController(t)
+			defer ctrl.Finish()
+
+			mockStepFunctionsClient := mocks.NewMockapi(ctrl)
+			tc.mockStepFunctionsClient(mockStepFunctionsClient)
+			sfn := StepFunctions{
+				client: mockStepFunctionsClient,
+			}
+
+			out, err := sfn.StateMachineDefinition(tc.inStateMachineARN)
+			if tc.wantedError != nil {
+				require.EqualError(t, tc.wantedError, err.Error())
+			} else {
+				require.Equal(t, tc.wantedDefinition, out)
+			}
+		})
+	}
+}