Add basic test

cmd/config.go

@@ -230,9 +230,9 @@ func (pc *PasswordConfig) Pass() (string, error) {
 	if pc.PasswordFile != "" {
 		contents, err := ioutil.ReadFile(pc.PasswordFile)
 		if err != nil {
-			return "", nil
+			return "", err
 		}
-		return string(contents), nil
+		return strings.TrimRight(string(contents), "\n"), nil
 	}
 	return pc.Password, nil
 }

cmd/config_test.go

@@ -0,0 +1,25 @@
+package cmd
+
+import (
+	"testing"
+
+	"github.com/letsencrypt/boulder/test"
+)
+
+func TestPasswordConfig(t *testing.T) {
+	tests := []struct {
+		pc       PasswordConfig
+		expected string
+	}{
+		{pc: PasswordConfig{}, expected: ""},
+		{pc: PasswordConfig{Password: "config"}, expected: "config"},
+		{pc: PasswordConfig{Password: "config", PasswordFile: "test_secret"}, expected: "secret"},
+		{pc: PasswordConfig{PasswordFile: "test_secret"}, expected: "secret"},
+	}
+
+	for _, tc := range tests {
+		password, err := tc.pc.Pass()
+		test.AssertNotError(t, err, "Failed to retrieve password")
+		test.AssertEquals(t, password, tc.expected)
+	}
+}

cmd/test_secret

@@ -0,0 +1 @@
+secret