diff --git a/api/krusty/stringquoteblank_test.go b/api/krusty/stringquoteblank_test.go
new file mode 100644
index 000000000..7c00ae183
--- /dev/null
+++ b/api/krusty/stringquoteblank_test.go
@@ -0,0 +1,79 @@
+package krusty_test
+
+import (
+	"testing"
+
+	kusttest_test "sigs.k8s.io/kustomize/api/testutils/kusttest"
+)
+
+// This test is for output string style.
+// Currently all quotes will be removed if the string is valid as plain (unquoted) style.
+// If a string cannot be unquoted, it will be put into a pair of single quotes.
+// See https://yaml.org/spec/1.2/spec.html#id2788859 for more details about what kind of string
+// is invalid as plain style.
+func TestLongLineBreaks(t *testing.T) {
+	th := kusttest_test.MakeHarness(t)
+	th.WriteF("/app/deployment.yaml", `
+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  name: test
+spec:
+  template:
+    spec:
+      containers:
+      - name: mariadb
+        image: test
+        env:
+        - name: SHORT_STRING
+          value: short_string
+        - name: SHORT_STRING_WITH_SINGLE_QUOTE
+          value: 'short_string'
+        - name: SHORT_STRING_WITH_DOUBLE_QUOTE
+          value: "short_string"
+        - name: SHORT_STRING_BLANK
+          value: short string
+        - name: LONG_STRING_BLANK
+          value: Lorem ipsum dolor sit amet, consectetur adipiscing elit. Maecenas suscipit ex non molestie varius.
+        - name: LONG_STRING_BLANK_WITH_SINGLE_QUOTE
+          value: 'Lorem ipsum dolor sit amet, consectetur adipiscing elit. Maecenas suscipit ex non molestie varius.'
+        - name: LONG_STRING_BLANK_WITH_DOUBLE_QUOTE
+          value: "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Maecenas suscipit ex non molestie varius."
+        - name: INVALID_PLAIN_STYLE_STRING
+          value: ': test'
+`)
+	th.WriteK("/app", `
+resources:
+- deployment.yaml
+`)
+	m := th.Run("/app", th.MakeDefaultOptions())
+	th.AssertActualEqualsExpected(m, `
+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  name: test
+spec:
+  template:
+    spec:
+      containers:
+      - env:
+        - name: SHORT_STRING
+          value: short_string
+        - name: SHORT_STRING_WITH_SINGLE_QUOTE
+          value: short_string
+        - name: SHORT_STRING_WITH_DOUBLE_QUOTE
+          value: short_string
+        - name: SHORT_STRING_BLANK
+          value: short string
+        - name: LONG_STRING_BLANK
+          value: Lorem ipsum dolor sit amet, consectetur adipiscing elit. Maecenas suscipit ex non molestie varius.
+        - name: LONG_STRING_BLANK_WITH_SINGLE_QUOTE
+          value: Lorem ipsum dolor sit amet, consectetur adipiscing elit. Maecenas suscipit ex non molestie varius.
+        - name: LONG_STRING_BLANK_WITH_DOUBLE_QUOTE
+          value: Lorem ipsum dolor sit amet, consectetur adipiscing elit. Maecenas suscipit ex non molestie varius.
+        - name: INVALID_PLAIN_STYLE_STRING
+          value: ': test'
+        image: test
+        name: mariadb
+`)
+}