add readFile func to isolate io ops

Author: dylanhitt

go.sum

@@ -1,8 +1,5 @@
 github.com/Microsoft/go-winio v0.4.14 h1:+hMXMk01us9KgxGb7ftKQt2Xpf5hH/yky+TDA+qxleU=
 github.com/Microsoft/go-winio v0.4.14/go.mod h1:qXqCSQ3Xa7+6tgxaGTIe4Kpcdsi+P8jBhyzoq1bpyYA=
-github.com/NYTimes/gziphandler v0.0.0-20170623195520-56545f4a5d46/go.mod h1:3wb06e3pkSAbeQ52E9H9iFoQsEEwGN64994WTCIhntQ=
-github.com/PuerkitoBio/purell v1.0.0/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
-github.com/PuerkitoBio/urlesc v0.0.0-20160726150825-5bd2802263f2/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE=
 github.com/SimonBaeumer/cmd v1.1.0 h1:tr5dUMlly/8bLiC5B0J1AcE4ISru8POEfzAirWnUJnY=
 github.com/SimonBaeumer/cmd v1.1.0/go.mod h1:4mc/LDXDWNbkeooqHP83yx3JXtInPHjJkF8zhzqqmZE=
 github.com/antchfx/jsonquery v1.0.0 h1:1Yhk496SrCoY6fJkFZqpXEqbwOw5sFtLns9la4NoK3I=
@@ -23,56 +20,11 @@ github.com/docker/go-connections v0.4.0 h1:El9xVISelRB7BuFusrZozjnkIM5YnzCViNKoh
 github.com/docker/go-connections v0.4.0/go.mod h1:Gbd7IOopHjR8Iph03tsViu4nIes5XhDvyHbTtUxmeec=
 github.com/docker/go-units v0.4.0 h1:3uh0PgVws3nIA0Q+MwDC8yjEPf9zjRfZZWXZYDct3Tw=
 github.com/docker/go-units v0.4.0/go.mod h1:fgPhTUdO+D/Jk86RDLlptpiXQzgHJF7gydDDbaIK4Dk=
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 github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
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 github.com/logrusorgru/aurora v0.0.0-20181002194514-a7b3b318ed4e/go.mod h1:7rIyQOR62GCctdiQpZ/zOJlFyk6y+94wXzv6RNZgaR4=
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-github.com/onsi/ginkgo v1.6.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
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-github.com/onsi/gomega v0.0.0-20170829124025-dcabb60a477c/go.mod h1:C1qb7wdrVGGVU+Z6iS04AVkA3Q65CEZX59MT0QO5uiA=
-github.com/onsi/gomega v1.7.0/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY=
 github.com/opencontainers/go-digest v1.0.0-rc1 h1:WzifXhOVOEOuFYOJAW6aQqW0TooG2iki3E3Ii+WN7gQ=
 github.com/opencontainers/go-digest v1.0.0-rc1/go.mod h1:cMLVZDEM3+U2I4VmLI6N8jQYUd2OVphdqWwCJHrFt2s=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
@@ -81,8 +33,6 @@ github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINE
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
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 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
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@@ -101,50 +51,18 @@ github.com/urfave/cli v1.20.0 h1:fDqGv3UG/4jbVl/QkFwEdddtEDjh/5Ov6X+0B/3bPaw=
 github.com/urfave/cli v1.20.0/go.mod h1:70zkFmudgCuE/ngEzBv17Jvp/497gISqfk5gWijbERA=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2 h1:VklqNMn3ovrHsnt90PveolxSbWFaJdECFbxSq0Mqo2M=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/net v0.0.0-20170114055629-f2499483f923/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
-golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
-golang.org/x/net v0.0.0-20191004110552-13f9640d40b9/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20191014212845-da9a3fd4c582 h1:p9xBe/w/OzkeYVKm234g55gMdD1nSIooTir5kV11kfA=
 golang.org/x/net v0.0.0-20191014212845-da9a3fd4c582/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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 golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a h1:1BGLXjeY4akVXGgbC9HugT3Jv3hCI0z56oJR5vAMgBU=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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pkg/app/test_command.go

@@ -5,7 +5,6 @@ import (
 	"io/ioutil"
 	"log"
 	"os"
-	"strings"
 	"sync"
 
 	"github.com/SimonBaeumer/commander/pkg/output"
@@ -35,7 +34,7 @@ func TestCommand(testPath string, testFilterTitle string, ctx AddCommandContext)
 		}
 		fmt.Println("Starting test against directory: " + testPath + "...")
 		fmt.Println("")
-		results, err = testDir(testPath, testFilterTitle)
+		results, err = testDir(testPath)
 	} else {
 		fmt.Println("Starting test file " + testPath + "...")
 		fmt.Println("")
@@ -54,7 +53,7 @@ func TestCommand(testPath string, testFilterTitle string, ctx AddCommandContext)
 	return nil
 }
 
-func testDir(directory string, title string) (<-chan runtime.TestResult, error) {
+func testDir(directory string) (<-chan runtime.TestResult, error) {
 	files, err := ioutil.ReadDir(directory)
 	if err != nil {
 		return nil, fmt.Errorf(err.Error())
@@ -72,7 +71,7 @@ func testDir(directory string, title string) (<-chan runtime.TestResult, error)
 				continue
 			}
 
-			fileResults, err := testFile(directory+"/"+f.Name(), title)
+			fileResults, err := testFile(directory+"/"+f.Name(), "")
 			if err != nil {
 				panic(fmt.Sprintf("%s: %s", f.Name(), err))
 			}
@@ -92,12 +91,9 @@ func testDir(directory string, title string) (<-chan runtime.TestResult, error)
 	return results, nil
 }
 
-func testFile(input string, title string) (<-chan runtime.TestResult, error) {
-	content, err := ioutil.ReadFile(input)
+func testFile(filePath string, title string) (<-chan runtime.TestResult, error) {
+	content, err := readFile(filePath)
 	if err != nil {
-		if strings.Contains(err.Error(), "is a directory") {
-			return nil, fmt.Errorf("Error %s: is a directory\nUse --dir to test directories with multiple test files", input)
-		}
 		return nil, fmt.Errorf("Error " + err.Error())
 	}
 
@@ -118,3 +114,21 @@ func testFile(input string, title string) (<-chan runtime.TestResult, error) {
 
 	return results, nil
 }
+
+func readFile(filePath string) ([]byte, error) {
+	f, err := os.Stat(filePath)
+	if err != nil {
+		return nil, fmt.Errorf("open %s: no such file or directory", filePath)
+	}
+
+	if f.IsDir() {
+		return nil, fmt.Errorf("%s: is a directory\nUse --dir to test directories with multiple test files", filePath)
+	}
+
+	content, err := ioutil.ReadFile(filePath)
+	if err != nil {
+		return nil, err
+	}
+
+	return content, nil
+}