diff --git a/.chronus/changes/copilot-add-enum-array-test-2026-0-15-14-32-1.md b/.chronus/changes/copilot-add-enum-array-test-2026-0-15-14-32-1.md
new file mode 100644
index 00000000000..7c90fe8ad55
--- /dev/null
+++ b/.chronus/changes/copilot-add-enum-array-test-2026-0-15-14-32-1.md
@@ -0,0 +1,7 @@
+---
+changeKind: feature
+packages:
+  - "@typespec/http-specs"
+---
+
+Add array encoding test for enum and extensible enum arrays.
\ No newline at end of file
diff --git a/packages/http-specs/spec-summary.md b/packages/http-specs/spec-summary.md
index 5f681324c59..af295728cc2 100644
--- a/packages/http-specs/spec-summary.md
+++ b/packages/http-specs/spec-summary.md
@@ -138,6 +138,174 @@ Expected response body:
 }
 ```
 
+### Encode_Array_Property_enumCommaDelimited
+
+- Endpoint: `post /encode/array/property/enum/comma-delimited`
+
+Test operation with request and response model contains an enum array property with commaDelimited encode.
+Expected request body:
+
+```json
+{
+  "value": "blue,red,green"
+}
+```
+
+Expected response body:
+
+```json
+{
+  "value": "blue,red,green"
+}
+```
+
+### Encode_Array_Property_enumNewlineDelimited
+
+- Endpoint: `post /encode/array/property/enum/newline-delimited`
+
+Test operation with request and response model contains an enum array property with newlineDelimited encode.
+Expected request body:
+
+```json
+{
+  "value": "blue\nred\ngreen"
+}
+```
+
+Expected response body:
+
+```json
+{
+  "value": "blue\nred\ngreen"
+}
+```
+
+### Encode_Array_Property_enumPipeDelimited
+
+- Endpoint: `post /encode/array/property/enum/pipe-delimited`
+
+Test operation with request and response model contains an enum array property with pipeDelimited encode.
+Expected request body:
+
+```json
+{
+  "value": "blue|red|green"
+}
+```
+
+Expected response body:
+
+```json
+{
+  "value": "blue|red|green"
+}
+```
+
+### Encode_Array_Property_enumSpaceDelimited
+
+- Endpoint: `post /encode/array/property/enum/space-delimited`
+
+Test operation with request and response model contains an enum array property with spaceDelimited encode.
+Expected request body:
+
+```json
+{
+  "value": "blue red green"
+}
+```
+
+Expected response body:
+
+```json
+{
+  "value": "blue red green"
+}
+```
+
+### Encode_Array_Property_extensibleEnumCommaDelimited
+
+- Endpoint: `post /encode/array/property/extensible-enum/comma-delimited`
+
+Test operation with request and response model contains an extensible enum (union) array property with commaDelimited encode.
+Expected request body:
+
+```json
+{
+  "value": "blue,red,green"
+}
+```
+
+Expected response body:
+
+```json
+{
+  "value": "blue,red,green"
+}
+```
+
+### Encode_Array_Property_extensibleEnumNewlineDelimited
+
+- Endpoint: `post /encode/array/property/extensible-enum/newline-delimited`
+
+Test operation with request and response model contains an extensible enum (union) array property with newlineDelimited encode.
+Expected request body:
+
+```json
+{
+  "value": "blue\nred\ngreen"
+}
+```
+
+Expected response body:
+
+```json
+{
+  "value": "blue\nred\ngreen"
+}
+```
+
+### Encode_Array_Property_extensibleEnumPipeDelimited
+
+- Endpoint: `post /encode/array/property/extensible-enum/pipe-delimited`
+
+Test operation with request and response model contains an extensible enum (union) array property with pipeDelimited encode.
+Expected request body:
+
+```json
+{
+  "value": "blue|red|green"
+}
+```
+
+Expected response body:
+
+```json
+{
+  "value": "blue|red|green"
+}
+```
+
+### Encode_Array_Property_extensibleEnumSpaceDelimited
+
+- Endpoint: `post /encode/array/property/extensible-enum/space-delimited`
+
+Test operation with request and response model contains an extensible enum (union) array property with spaceDelimited encode.
+Expected request body:
+
+```json
+{
+  "value": "blue red green"
+}
+```
+
+Expected response body:
+
+```json
+{
+  "value": "blue red green"
+}
+```
+
 ### Encode_Array_Property_newlineDelimited
 
 - Endpoint: `post /encode/array/property/newline-delimited`
diff --git a/packages/http-specs/specs/encode/array/main.tsp b/packages/http-specs/specs/encode/array/main.tsp
index 4e707eeb41d..5ee5fef6eeb 100644
--- a/packages/http-specs/specs/encode/array/main.tsp
+++ b/packages/http-specs/specs/encode/array/main.tsp
@@ -8,6 +8,19 @@ using Spector;
 @scenarioService("/encode/array")
 namespace Encode.Array;
 
+enum Colors {
+  Blue: "blue",
+  Red: "red",
+  Green: "green",
+}
+
+union ColorsExtensibleEnum {
+  string,
+  Blue: "blue",
+  Red: "red",
+  Green: "green",
+}
+
 model CommaDelimitedArrayProperty {
   @encode(ArrayEncoding.commaDelimited)
   value: string[];
@@ -28,6 +41,46 @@ model NewlineDelimitedArrayProperty {
   value: string[];
 }
 
+model CommaDelimitedEnumArrayProperty {
+  @encode(ArrayEncoding.commaDelimited)
+  value: Colors[];
+}
+
+model SpaceDelimitedEnumArrayProperty {
+  @encode(ArrayEncoding.spaceDelimited)
+  value: Colors[];
+}
+
+model PipeDelimitedEnumArrayProperty {
+  @encode(ArrayEncoding.pipeDelimited)
+  value: Colors[];
+}
+
+model NewlineDelimitedEnumArrayProperty {
+  @encode(ArrayEncoding.newlineDelimited)
+  value: Colors[];
+}
+
+model CommaDelimitedExtensibleEnumArrayProperty {
+  @encode(ArrayEncoding.commaDelimited)
+  value: ColorsExtensibleEnum[];
+}
+
+model SpaceDelimitedExtensibleEnumArrayProperty {
+  @encode(ArrayEncoding.spaceDelimited)
+  value: ColorsExtensibleEnum[];
+}
+
+model PipeDelimitedExtensibleEnumArrayProperty {
+  @encode(ArrayEncoding.pipeDelimited)
+  value: ColorsExtensibleEnum[];
+}
+
+model NewlineDelimitedExtensibleEnumArrayProperty {
+  @encode(ArrayEncoding.newlineDelimited)
+  value: ColorsExtensibleEnum[];
+}
+
 @route("/property")
 namespace Property {
   @route("/comma-delimited")
@@ -109,4 +162,178 @@ namespace Property {
     """)
   @post
   op newlineDelimited(@body body: NewlineDelimitedArrayProperty): NewlineDelimitedArrayProperty;
+
+  @route("/enum/comma-delimited")
+  @scenario
+  @scenarioDoc("""
+    Test operation with request and response model contains an enum array property with commaDelimited encode.
+    Expected request body:
+    ```json
+    {
+      "value": "blue,red,green"
+    }
+    ```
+    Expected response body:
+    ```json
+    {
+      "value": "blue,red,green"
+    }
+    ```
+    """)
+  @post
+  op enumCommaDelimited(
+    @body body: CommaDelimitedEnumArrayProperty,
+  ): CommaDelimitedEnumArrayProperty;
+
+  @route("/enum/space-delimited")
+  @scenario
+  @scenarioDoc("""
+    Test operation with request and response model contains an enum array property with spaceDelimited encode.
+    Expected request body:
+    ```json
+    {
+      "value": "blue red green"
+    }
+    ```
+    Expected response body:
+    ```json
+    {
+      "value": "blue red green"
+    }
+    ```
+    """)
+  @post
+  op enumSpaceDelimited(
+    @body body: SpaceDelimitedEnumArrayProperty,
+  ): SpaceDelimitedEnumArrayProperty;
+
+  @route("/enum/pipe-delimited")
+  @scenario
+  @scenarioDoc("""
+    Test operation with request and response model contains an enum array property with pipeDelimited encode.
+    Expected request body:
+    ```json
+    {
+      "value": "blue|red|green"
+    }
+    ```
+    Expected response body:
+    ```json
+    {
+      "value": "blue|red|green"
+    }
+    ```
+    """)
+  @post
+  op enumPipeDelimited(@body body: PipeDelimitedEnumArrayProperty): PipeDelimitedEnumArrayProperty;
+
+  @route("/enum/newline-delimited")
+  @scenario
+  @scenarioDoc("""
+    Test operation with request and response model contains an enum array property with newlineDelimited encode.
+    Expected request body:
+    ```json
+    {
+      "value": "blue\\nred\\ngreen"
+    }
+    ```
+    Expected response body:
+    ```json
+    {
+      "value": "blue\\nred\\ngreen"
+    }
+    ```
+    """)
+  @post
+  op enumNewlineDelimited(
+    @body body: NewlineDelimitedEnumArrayProperty,
+  ): NewlineDelimitedEnumArrayProperty;
+
+  @route("/extensible-enum/comma-delimited")
+  @scenario
+  @scenarioDoc("""
+    Test operation with request and response model contains an extensible enum (union) array property with commaDelimited encode.
+    Expected request body:
+    ```json
+    {
+      "value": "blue,red,green"
+    }
+    ```
+    Expected response body:
+    ```json
+    {
+      "value": "blue,red,green"
+    }
+    ```
+    """)
+  @post
+  op extensibleEnumCommaDelimited(
+    @body body: CommaDelimitedExtensibleEnumArrayProperty,
+  ): CommaDelimitedExtensibleEnumArrayProperty;
+
+  @route("/extensible-enum/space-delimited")
+  @scenario
+  @scenarioDoc("""
+    Test operation with request and response model contains an extensible enum (union) array property with spaceDelimited encode.
+    Expected request body:
+    ```json
+    {
+      "value": "blue red green"
+    }
+    ```
+    Expected response body:
+    ```json
+    {
+      "value": "blue red green"
+    }
+    ```
+    """)
+  @post
+  op extensibleEnumSpaceDelimited(
+    @body body: SpaceDelimitedExtensibleEnumArrayProperty,
+  ): SpaceDelimitedExtensibleEnumArrayProperty;
+
+  @route("/extensible-enum/pipe-delimited")
+  @scenario
+  @scenarioDoc("""
+    Test operation with request and response model contains an extensible enum (union) array property with pipeDelimited encode.
+    Expected request body:
+    ```json
+    {
+      "value": "blue|red|green"
+    }
+    ```
+    Expected response body:
+    ```json
+    {
+      "value": "blue|red|green"
+    }
+    ```
+    """)
+  @post
+  op extensibleEnumPipeDelimited(
+    @body body: PipeDelimitedExtensibleEnumArrayProperty,
+  ): PipeDelimitedExtensibleEnumArrayProperty;
+
+  @route("/extensible-enum/newline-delimited")
+  @scenario
+  @scenarioDoc("""
+    Test operation with request and response model contains an extensible enum (union) array property with newlineDelimited encode.
+    Expected request body:
+    ```json
+    {
+      "value": "blue\\nred\\ngreen"
+    }
+    ```
+    Expected response body:
+    ```json
+    {
+      "value": "blue\\nred\\ngreen"
+    }
+    ```
+    """)
+  @post
+  op extensibleEnumNewlineDelimited(
+    @body body: NewlineDelimitedExtensibleEnumArrayProperty,
+  ): NewlineDelimitedExtensibleEnumArrayProperty;
 }
diff --git a/packages/http-specs/specs/encode/array/mockapi.ts b/packages/http-specs/specs/encode/array/mockapi.ts
index 8b22eeb67ea..f7ceec959e5 100644
--- a/packages/http-specs/specs/encode/array/mockapi.ts
+++ b/packages/http-specs/specs/encode/array/mockapi.ts
@@ -41,3 +41,43 @@ Scenarios.Encode_Array_Property_newlineDelimited = createPropertyServerTests(
   "/encode/array/property/newline-delimited",
   "\n",
 );
+
+Scenarios.Encode_Array_Property_enumCommaDelimited = createPropertyServerTests(
+  "/encode/array/property/enum/comma-delimited",
+  ",",
+);
+
+Scenarios.Encode_Array_Property_enumSpaceDelimited = createPropertyServerTests(
+  "/encode/array/property/enum/space-delimited",
+  " ",
+);
+
+Scenarios.Encode_Array_Property_enumPipeDelimited = createPropertyServerTests(
+  "/encode/array/property/enum/pipe-delimited",
+  "|",
+);
+
+Scenarios.Encode_Array_Property_enumNewlineDelimited = createPropertyServerTests(
+  "/encode/array/property/enum/newline-delimited",
+  "\n",
+);
+
+Scenarios.Encode_Array_Property_extensibleEnumCommaDelimited = createPropertyServerTests(
+  "/encode/array/property/extensible-enum/comma-delimited",
+  ",",
+);
+
+Scenarios.Encode_Array_Property_extensibleEnumSpaceDelimited = createPropertyServerTests(
+  "/encode/array/property/extensible-enum/space-delimited",
+  " ",
+);
+
+Scenarios.Encode_Array_Property_extensibleEnumPipeDelimited = createPropertyServerTests(
+  "/encode/array/property/extensible-enum/pipe-delimited",
+  "|",
+);
+
+Scenarios.Encode_Array_Property_extensibleEnumNewlineDelimited = createPropertyServerTests(
+  "/encode/array/property/extensible-enum/newline-delimited",
+  "\n",
+);