Add integration tests for the --header option

integration/hurl/tests_ok/add_header.hurl

@@ -0,0 +1,11 @@
+GET http://localhost:8000/add-header
+HTTP 200
+
+GET http://localhost:8000/add-header-with-aggregation
+header-a: foo
+HTTP 200
+
+GET http://localhost:8000/add-header-with-duplicate
+header-b: bar
+{"message":"hi!"}
+HTTP 200

integration/hurl/tests_ok/add_header.ps1

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+Set-StrictMode -Version latest
+$ErrorActionPreference = 'Stop'
+
+hurl --header 'header-b:baz' --header 'header-c:qux' tests_ok/add_header.hurl

integration/hurl/tests_ok/add_header.py

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+from app import app
+from flask import request
+
+
+@app.route("/add-header")
+def add_header():
+    assert request.headers.get("header-b") == "baz"
+    assert request.headers.get("header-c") == "qux"
+    return ""
+
+
+@app.route("/add-header-with-aggregation")
+def add_header_with_aggregation():
+    assert request.headers.get("header-a") == "foo"
+    assert request.headers.get("header-b") == "baz"
+    assert request.headers.get("header-c") == "qux"
+    return ""
+
+
+@app.route("/add-header-with-duplicate")
+def add_header_with_duplicate():
+    assert request.headers.get("header-b") == "bar,baz"
+    assert request.headers.get("header-c") == "qux"
+    assert request.get_json()["message"] == "hi!"
+    return ""

integration/hurl/tests_ok/add_header.sh

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+#!/bin/bash
+set -Eeuo pipefail
+
+hurl --header 'header-b:baz' --header 'header-c:qux' tests_ok/add_header.hurl

integration/hurl/tests_ok/override_header.hurl

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+GET http://localhost:8000/override-header
+HTTP 200

integration/hurl/tests_ok/override_header.ps1

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+Set-StrictMode -Version latest
+$ErrorActionPreference = 'Stop'
+
+hurl --header 'User-Agent: different-user-agent' --header 'Accept: different-accept' --header 'Host: different-host' tests_ok/override_header.hurl

integration/hurl/tests_ok/override_header.py

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+from app import app
+from flask import request
+
+
+@app.route("/override-header")
+def override_user_agent():
+    assert request.headers.get("User-Agent") == "different-user-agent"
+    assert request.headers.get("Accept") == "different-accept"
+    assert request.headers.get("Host") == "different-host"
+    return ""

integration/hurl/tests_ok/override_header.sh

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+#!/bin/bash
+set -Eeuo pipefail
+
+hurl --header 'User-Agent: different-user-agent' --header 'Accept: different-accept' --header 'Host: different-host' tests_ok/override_header.hurl