Merged envsubst into env operators

pkg/yqlib/operator_env_test.go

@@ -62,6 +62,39 @@ var envOperatorScenarios = []expressionScenario{
 			"D0, P[cat], (!!str)::meow\n",
 		},
 	},
+	{
+		description:         "Replace strings with envsubst",
+		environmentVariable: "cat",
+		expression:          `"the ${myenv} meows" | envsubst`,
+		expected: []string{
+			"D0, P[], (!!str)::the cat meows\n",
+		},
+	},
+	{
+		description:         "Replace strings with envsubst, missing variables",
+		environmentVariable: "cat",
+		expression:          `"the ${myenvnonexisting} meows" | envsubst`,
+		expected: []string{
+			"D0, P[], (!!str)::the  meows\n",
+		},
+	},
+	{
+		description:         "Replace strings with envsubst, missing variables with defaults",
+		environmentVariable: "cat",
+		expression:          `"the ${myenvnonexisting-dog} meows" | envsubst`,
+		expected: []string{
+			"D0, P[], (!!str)::the dog meows\n",
+		},
+	},
+	{
+		description:         "Replace string environment variable in document",
+		environmentVariable: "cat meow",
+		document:            "{v: \"${myenv}\"}",
+		expression:          `.v |= envsubst`,
+		expected: []string{
+			"D0, P[], (doc)::{v: \"cat meow\"}\n",
+		},
+	},
 }
 
 func TestEnvOperatorScenarios(t *testing.T) {