Merge pull request #25262 from menghanl/testing_desc

xds testing: add test cases for header/path matching to test desc

doc/xds-test-descriptions.md

@@ -375,25 +375,27 @@ Assert:
 1.  UnaryCall RPCs are sent to MIG_default
 1.  EmptyCall RPCs are sent to MIG_default
 
-The test driver adds a route for EmptyCall, routes become:
+The test driver changes route and asserts RPCs are sent to expected backends. **Note** that the default route `"/"` is always pointing to MIG_default, so all RPCs not matching the new route will be sent to MIG_default.
 
-1.  path{“/grpc.testing.TestService/EmptyCall”}: MIG_2
-1.  “/”: MIG_default
+- {path: `/grpc.testing.TestService/EmptyCall`}: MIG_2
+  - UnaryCall -> MIG_default
+  - EmptyCall -> MIG_2
 
-Assert:
-
-1.  UnaryCall RPCs are sent to MIG_default
-1.  EmptyCall RPCs are sent to MIG_2
+- {prefix: `/grpc.testing.TestService/Unary`}: MIG_2
+  - UnaryCall -> MIG_2
+  - EmptyCall -> MIG_default
 
-The test driver adds a route for prefix Unary, routes become:
+- {prefix: `/grpc.testing.TestService/Unary`}: MIG_default & {path: `/grpc.testing.TestService/EmptyCall`}: MIG_2
+  - UnaryCall -> MIG_default
+  - EmptyCall -> MIG_2
 
-1.  prefix{“/grpc.testing.TestService/Unary”}: MIG_2
-1.  “/”: MIG_default
+- {regex: `^\/.*\/UnaryCall$`}: MIG_2
+  - UnaryCall -> MIG_2
+  - EmptyCall -> MIG_default
 
-Assert:
-
-1.  UnaryCall RPCs are sent to MIG_2
-1.  EmptyCall RPCs are sent to MIG_default
+- {path: `/gRpC.tEsTinG.tEstseRvice/empTycaLl`, ignoreCase: `True`}: MIG_2
+  - UnaryCall -> MIG_default
+  - EmptyCall -> MIG_2
 
 ### header_matching
 
@@ -419,15 +421,41 @@ Assert:
 1.  UnaryCall RPCs are sent to MIG_default
 1.  EmptyCall RPCs are sent to MIG_default
 
-The test driver adds a route for header exact match, routes become:
-
-1.  header{“xds_md”, exact: “exact_match”}: MIG_2
-1.  “/”: MIG_default
-
-Assert:
-
-1.  UnaryCall RPCs are sent to MIG_default
-1.  EmptyCall RPCs are sent to MIG_2
+The test driver changes route and asserts RPCs are sent to expected backends. **Note** that the default route `"/"` is always pointing to MIG_default, so all RPCs not matching the new route will be sent to MIG_default.
+
+- {header `xds_md`, exact: `empty_ytpme`}: MIG_2
+	- Unary -> MIG_default
+	- Empty -> MIG_2
+
+- {header `xds_md`, prefix: `un`}: MIG_2
+	- `un` is the prefix of metadata sent with UnaryCall
+	- Unary -> MIG_2
+	- Empty -> MIG_default
+
+- {header `xds_md`, suffix: `me`}: MIG_2
+	- `me` is the suffix of metadata sent with EmptyCall
+	- Unary -> MIG_default
+	- Empty to MIG_2
+
+- {header `xds_md_numeric`, present: `True`}: MIG_2
+	- Unary is sent with the metadata, so will be sent to alternative
+	- Unary -> MIG_2
+	- Empty -> MIG_default
+
+- {header `xds_md`, exact: `unary_yranu`, invert: `True`}: MIG_2
+	- Unary is sent with the metadata, so this will not match Unary, but will match Empty
+	- Unary -> MIG_default
+	- Empty to MIG_2
+
+- {header `xds_md_numeric`, range `[100,200]`}: MIG_2
+	- Unary is sent with the metadata in range
+	- Unary -> MIG_2
+	- Empty -> MIG_default
+
+- {header `xds_md`, regex: `^em.*me$`}: MIG_2
+	- EmptyCall is sent with the metadata
+	- Unary -> MIG_default
+	- Empty -> MIG_2
 
 ### gentle_failover