Add HasSecrets func (#7)

* Update readme

* Add HasSecrets func

* Add tests

README.md

@@ -1,5 +1,7 @@
 # Serum
 
+> NOTE: Serum is still pre v1.0, the API is still evolving and breaking changes can occur
+
 Serum is a library that facilitates injecting environment variables and secrets into your application at run time.
 It can load the key/value pairs from a `.env` file and it can use a `SecretProvider` to decrypt the secrets that
 are included in the `.env` file.

serum.go

@@ -55,3 +55,9 @@ func (in *Injector) Load(path string) error {
 	in.envVars = envVars
 	return nil
 }
+
+// HasSecrets returns true if the injector contains encrypted
+// secrets, false otherwise.
+func (in *Injector) HasSecrets() bool {
+	return len(in.envVars.Secrets) > 0
+}

serum_test.go

@@ -158,3 +158,43 @@ func TestInjectDecryptError(t *testing.T) {
 	g.Expect(err).ToNot(BeNil())
 	g.Expect(err.Error()).To(ContainSubstring("serum: error decrypting secret"))
 }
+
+func TestHasSecrets(t *testing.T) {
+	g := NewGomegaWithT(t)
+
+	tt := []struct {
+		name     string
+		env      *envparser.EnvVars
+		expected bool
+	}{
+		{
+			name: "no secrets",
+			env: &envparser.EnvVars{
+				Plain: map[string]string{
+					"PLAIN": "123456",
+				},
+			},
+			expected: false,
+		},
+		{
+			name: "with secrets",
+			env: &envparser.EnvVars{
+				Plain: map[string]string{
+					"PLAIN": "123456",
+				},
+				Secrets: map[string]string{
+					"SECRET": "superSecret111",
+				},
+			},
+			expected: true,
+		},
+	}
+
+	for _, tc := range tt {
+		ij := &Injector{
+			envVars: tc.env,
+		}
+
+		g.Expect(ij.HasSecrets()).To(Equal(tc.expected))
+	}
+}