adding debug tests

cmd/app.go

@@ -1,6 +1,7 @@
 package cmd
 
 import (
+	"bytes"
 	"fmt"
 	"io"
 	"os"
@@ -117,12 +118,15 @@ func outputHostsfile(hf *hostsfile.Hosts, all bool) {
 			}
 		}
 
-		lineOutput := fmt.Sprintf("%s\n", line.Raw)
+		lineOutput := line.Raw
 		if line.IsMalformed() {
-			lineOutput = fmt.Sprintf("%s # <<< Malformed!\n", lineOutput)
+			logrus.Debugf("malformed line: %s", line.Err)
+			if !line.HasComment() {
+				lineOutput = fmt.Sprintf("%s #", lineOutput)
+			}
+			lineOutput = fmt.Sprintf("%s <<< Malformed!", lineOutput)
 		}
-
-		logrus.Infof(lineOutput)
+		logrus.Info(lineOutput + "\n")
 	}
 }
 
@@ -166,13 +170,15 @@ func debugFooter(c *cli.Context) error {
 		{"malformed", fmt.Sprintf("%d", malformed)},
 	}
 
-	table := tablewriter.NewWriter(os.Stdout)
+	buf := &bytes.Buffer{}
+	table := tablewriter.NewWriter(buf)
 	table.SetHeader([]string{"Type", "Count"})
 
 	for _, v := range data {
 		table.Append(v)
 	}
 	table.Render()
+	logrus.Info(buf)
 
 	return nil
 }

cmd/app_test.go

@@ -11,7 +11,7 @@ import (
 	easy "github.com/t-tomalak/logrus-easy-formatter"
 )
 
-func TestDebug(t *testing.T) {
+func TestDebugFlag(t *testing.T) {
 	args, out := setup("--debug", "version")
 	Version("test-version", "test-commit", "test-date")
 	assert.Nil(t, App.Run(args))
@@ -47,10 +47,10 @@ func read(t *testing.T, name, file string) func() {
 	}
 }
 
-//func write(t *testing.T, name, file string) func() {
-//	err := os.WriteFile(name, []byte(file), 0770)
-//	assert.Nil(t, err)
-//	return func() {
-//		assert.Nil(t, os.Remove(name))
-//	}
-//}
+func write(t *testing.T, name, file string) func() {
+	err := os.WriteFile(name, []byte(file), 0770)
+	assert.Nil(t, err)
+	return func() {
+		assert.Nil(t, os.Remove(name))
+	}
+}

cmd/debug_test.go

@@ -0,0 +1,98 @@
+package cmd
+
+import (
+	"runtime"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestDebug(t *testing.T) {
+
+	// app run will return an error if the hostsfile does not exist
+	t.Run("hostsfile that doesn't exist", func(t *testing.T) {
+		args, _ := setup("-f", "no-existy", "debug")
+		err := App.Run(args)
+		assert.NotEmpty(t, err)
+		if runtime.GOOS == "windows" {
+			assert.Equal(t, "open no-existy: The system cannot find the file specified.", err.Error())
+		} else {
+			assert.Equal(t, "open no-existy: no such file or directory", err.Error())
+		}
+	})
+
+	tests := map[string]struct {
+		input    string
+		expected string
+	}{
+		"hostsfile has only 1 line": {
+			input: `127.0.0.1 localhost
+`,
+			expected: `hosts file path: test-debug
++-----------+-------+
+|   TYPE    | COUNT |
++-----------+-------+
+| lines     |     1 |
+| entries   |     1 |
+| comments  |     0 |
+| empty     |     0 |
+| malformed |     0 |
++-----------+-------+
+`,
+		},
+		"hotsfile only has 1 malformed line": {
+			input: `127.x.x.x localhost
+`,
+			expected: `hosts file path: test-debug
++-----------+-------+
+|   TYPE    | COUNT |
++-----------+-------+
+| lines     |     1 |
+| entries   |     1 |
+| comments  |     0 |
+| empty     |     0 |
+| malformed |     1 |
++-----------+-------+
+`,
+		},
+		"hotsfile only has 1 empty line": {
+			input: `
+`,
+			expected: `hosts file path: test-debug
++-----------+-------+
+|   TYPE    | COUNT |
++-----------+-------+
+| lines     |     1 |
+| entries   |     0 |
+| comments  |     0 |
+| empty     |     1 |
+| malformed |     0 |
++-----------+-------+
+`,
+		},
+		"hotsfile only has 1 comment line": {
+			input: `# comment
+`,
+			expected: `hosts file path: test-debug
++-----------+-------+
+|   TYPE    | COUNT |
++-----------+-------+
+| lines     |     1 |
+| entries   |     0 |
+| comments  |     1 |
+| empty     |     0 |
+| malformed |     0 |
++-----------+-------+
+`,
+		},
+	}
+
+	for name, test := range tests {
+		t.Run(name, func(t *testing.T) {
+			defer read(t, "test-debug", test.input)()
+			args, out := setup("-f", "test-debug", "debug")
+			assert.Nil(t, App.Run(args))
+			assert.Equal(t, test.expected, out.String())
+		})
+	}
+}

cmd/list_test.go

@@ -8,22 +8,60 @@ import (
 )
 
 func TestList(t *testing.T) {
-	args, _ := setup("-f", "no-existy", "list")
-	err := App.Run(args)
-	assert.NotEmpty(t, err)
-	if runtime.GOOS == "windows" {
-		assert.Equal(t, "open no-existy: The system cannot find the file specified.", err.Error())
-	} else {
-		assert.Equal(t, "open no-existy: no such file or directory", err.Error())
-	}
+	// app run will return an error if the hostsfile does not exist
+	t.Run("hostsfile that doesn't exist", func(t *testing.T) {
+		args, _ := setup("-f", "no-existy", "list")
+		err := App.Run(args)
+		assert.NotEmpty(t, err)
+		if runtime.GOOS == "windows" {
+			assert.Equal(t, "open no-existy: The system cannot find the file specified.", err.Error())
+		} else {
+			assert.Equal(t, "open no-existy: no such file or directory", err.Error())
+		}
+	})
+
+	// this is really a noop but future proofs us a bit
+	t.Run("hostsfile that is write accessible", func(t *testing.T) {
+		defer write(t, "test-list", "127.0.0.1 localhost")()
+		args, out := setup("-f", "test-list", "list")
+		assert.Empty(t, App.Run(args))
+		assert.Equal(t, "127.0.0.1 localhost"+"\n", out.String())
+	})
 
-	file := "list"
-	content := "127.0.0.1 localhost"
+	// test reading the system hostsfile
+	t.Run("read the system hostsfile", func(t *testing.T) {
+		args, out := setup("list")
+		assert.Empty(t, App.Run(args))
+		assert.NotEmpty(t, out)
+	})
 
-	cleanup := read(t, file, content)
-	defer cleanup()
+	tests := map[string]struct {
+		input    string
+		expected string
+	}{
+		"hostsfile that is readonly": {
+			input: `127.0.0.1 localhost
+`,
+			expected: `127.0.0.1 localhost
+`,
+		},
+		"malformed comment added to row": {
+			input: `127.x.x.x localhost
+127.x.x.x localhost # comment
+`,
+			expected: `127.x.x.x localhost # <<< Malformed!
+127.x.x.x localhost # comment <<< Malformed!
+`,
+		},
+	}
+
+	for name, test := range tests {
+		t.Run(name, func(t *testing.T) {
+			defer read(t, "list-test", test.input)()
+			args, out := setup("-f", "list-test", "list")
+			assert.Empty(t, App.Run(args))
+			assert.Equal(t, test.expected, out.String())
+		})
+	}
 
-	args, out := setup("-f", file, "list")
-	assert.Empty(t, App.Run(args))
-	assert.Equal(t, content+"\n", out.String())
 }