diff --git a/test/ciao/autocomplete/language_default.coffee b/test/ciao/autocomplete/language_default.coffee
new file mode 100644
index 00000000..3e39e8db
--- /dev/null
+++ b/test/ciao/autocomplete/language_default.coffee
@@ -0,0 +1,37 @@
+
+#> language
+path: '/v1/autocomplete?text=example'
+
+#? 200 ok
+response.statusCode.should.be.equal 200
+response.should.have.header 'charset', 'utf8'
+response.should.have.header 'content-type', 'application/json; charset=utf-8'
+
+#? valid geocoding block
+should.exist json.geocoding
+should.exist json.geocoding.version
+should.exist json.geocoding.attribution
+should.exist json.geocoding.query
+should.exist json.geocoding.engine
+should.exist json.geocoding.engine.name
+should.exist json.geocoding.engine.author
+should.exist json.geocoding.engine.version
+should.exist json.geocoding.timestamp
+
+#? valid geojson
+json.type.should.be.equal 'FeatureCollection'
+json.features.should.be.instanceof Array
+
+#? expected errors
+should.not.exist json.geocoding.errors
+
+#? expected warnings
+should.not.exist json.geocoding.warnings
+
+#? language
+json.geocoding.query['lang'].should.eql {
+  name: 'English',
+  iso6391: 'en',
+  iso6393: 'eng',
+  defaulted: true
+}
diff --git a/test/ciao/autocomplete/language_header_invalid.coffee b/test/ciao/autocomplete/language_header_invalid.coffee
new file mode 100644
index 00000000..0e9e8e41
--- /dev/null
+++ b/test/ciao/autocomplete/language_header_invalid.coffee
@@ -0,0 +1,38 @@
+
+#> language
+path: '/v1/autocomplete?text=example'
+headers: 'Accept-Language': 'example'
+
+#? 200 ok
+response.statusCode.should.be.equal 200
+response.should.have.header 'charset', 'utf8'
+response.should.have.header 'content-type', 'application/json; charset=utf-8'
+
+#? valid geocoding block
+should.exist json.geocoding
+should.exist json.geocoding.version
+should.exist json.geocoding.attribution
+should.exist json.geocoding.query
+should.exist json.geocoding.engine
+should.exist json.geocoding.engine.name
+should.exist json.geocoding.engine.author
+should.exist json.geocoding.engine.version
+should.exist json.geocoding.timestamp
+
+#? valid geojson
+json.type.should.be.equal 'FeatureCollection'
+json.features.should.be.instanceof Array
+
+#? expected errors
+should.not.exist json.geocoding.errors
+
+#? expected warnings
+should.not.exist json.geocoding.warnings
+
+#? language
+json.geocoding.query['lang'].should.eql {
+  name: 'English',
+  iso6391: 'en',
+  iso6393: 'eng',
+  defaulted: true
+}
diff --git a/test/ciao/autocomplete/language_header_valid.coffee b/test/ciao/autocomplete/language_header_valid.coffee
new file mode 100644
index 00000000..aea8c28c
--- /dev/null
+++ b/test/ciao/autocomplete/language_header_valid.coffee
@@ -0,0 +1,38 @@
+
+#> language
+path: '/v1/autocomplete?text=example'
+headers: 'Accept-Language': 'fr-CH, fr;q=0.9, en;q=0.8, de;q=0.7, *;q=0.5'
+
+#? 200 ok
+response.statusCode.should.be.equal 200
+response.should.have.header 'charset', 'utf8'
+response.should.have.header 'content-type', 'application/json; charset=utf-8'
+
+#? valid geocoding block
+should.exist json.geocoding
+should.exist json.geocoding.version
+should.exist json.geocoding.attribution
+should.exist json.geocoding.query
+should.exist json.geocoding.engine
+should.exist json.geocoding.engine.name
+should.exist json.geocoding.engine.author
+should.exist json.geocoding.engine.version
+should.exist json.geocoding.timestamp
+
+#? valid geojson
+json.type.should.be.equal 'FeatureCollection'
+json.features.should.be.instanceof Array
+
+#? expected errors
+should.not.exist json.geocoding.errors
+
+#? expected warnings
+should.not.exist json.geocoding.warnings
+
+#? language
+json.geocoding.query['lang'].should.eql {
+  defaulted: false,
+  iso6391: 'fr',
+  iso6393: 'fra',
+  name: 'French'
+}
diff --git a/test/ciao/place/language_default.coffee b/test/ciao/place/language_default.coffee
new file mode 100644
index 00000000..444b6254
--- /dev/null
+++ b/test/ciao/place/language_default.coffee
@@ -0,0 +1,37 @@
+
+#> language
+path: '/v1/place?ids=geonames:venue:1'
+
+#? 200 ok
+response.statusCode.should.be.equal 200
+response.should.have.header 'charset', 'utf8'
+response.should.have.header 'content-type', 'application/json; charset=utf-8'
+
+#? valid geocoding block
+should.exist json.geocoding
+should.exist json.geocoding.version
+should.exist json.geocoding.attribution
+should.exist json.geocoding.query
+should.exist json.geocoding.engine
+should.exist json.geocoding.engine.name
+should.exist json.geocoding.engine.author
+should.exist json.geocoding.engine.version
+should.exist json.geocoding.timestamp
+
+#? valid geojson
+json.type.should.be.equal 'FeatureCollection'
+json.features.should.be.instanceof Array
+
+#? expected errors
+should.not.exist json.geocoding.errors
+
+#? expected warnings
+should.not.exist json.geocoding.warnings
+
+#? language
+json.geocoding.query['lang'].should.eql {
+  name: 'English',
+  iso6391: 'en',
+  iso6393: 'eng',
+  defaulted: true
+}
diff --git a/test/ciao/place/language_header_invalid.coffee b/test/ciao/place/language_header_invalid.coffee
new file mode 100644
index 00000000..94cd167a
--- /dev/null
+++ b/test/ciao/place/language_header_invalid.coffee
@@ -0,0 +1,38 @@
+
+#> language
+path: '/v1/place?ids=geonames:venue:1'
+headers: 'Accept-Language': 'example'
+
+#? 200 ok
+response.statusCode.should.be.equal 200
+response.should.have.header 'charset', 'utf8'
+response.should.have.header 'content-type', 'application/json; charset=utf-8'
+
+#? valid geocoding block
+should.exist json.geocoding
+should.exist json.geocoding.version
+should.exist json.geocoding.attribution
+should.exist json.geocoding.query
+should.exist json.geocoding.engine
+should.exist json.geocoding.engine.name
+should.exist json.geocoding.engine.author
+should.exist json.geocoding.engine.version
+should.exist json.geocoding.timestamp
+
+#? valid geojson
+json.type.should.be.equal 'FeatureCollection'
+json.features.should.be.instanceof Array
+
+#? expected errors
+should.not.exist json.geocoding.errors
+
+#? expected warnings
+should.not.exist json.geocoding.warnings
+
+#? language
+json.geocoding.query['lang'].should.eql {
+  name: 'English',
+  iso6391: 'en',
+  iso6393: 'eng',
+  defaulted: true
+}
diff --git a/test/ciao/place/language_header_valid.coffee b/test/ciao/place/language_header_valid.coffee
new file mode 100644
index 00000000..639d3b72
--- /dev/null
+++ b/test/ciao/place/language_header_valid.coffee
@@ -0,0 +1,38 @@
+
+#> language
+path: '/v1/place?ids=geonames:venue:1'
+headers: 'Accept-Language': 'fr-CH, fr;q=0.9, en;q=0.8, de;q=0.7, *;q=0.5'
+
+#? 200 ok
+response.statusCode.should.be.equal 200
+response.should.have.header 'charset', 'utf8'
+response.should.have.header 'content-type', 'application/json; charset=utf-8'
+
+#? valid geocoding block
+should.exist json.geocoding
+should.exist json.geocoding.version
+should.exist json.geocoding.attribution
+should.exist json.geocoding.query
+should.exist json.geocoding.engine
+should.exist json.geocoding.engine.name
+should.exist json.geocoding.engine.author
+should.exist json.geocoding.engine.version
+should.exist json.geocoding.timestamp
+
+#? valid geojson
+json.type.should.be.equal 'FeatureCollection'
+json.features.should.be.instanceof Array
+
+#? expected errors
+should.not.exist json.geocoding.errors
+
+#? expected warnings
+should.not.exist json.geocoding.warnings
+
+#? language
+json.geocoding.query['lang'].should.eql {
+  defaulted: false,
+  iso6391: 'fr',
+  iso6393: 'fra',
+  name: 'French'
+}
diff --git a/test/ciao/reverse/language_default.coffee b/test/ciao/reverse/language_default.coffee
new file mode 100644
index 00000000..659aa5c2
--- /dev/null
+++ b/test/ciao/reverse/language_default.coffee
@@ -0,0 +1,37 @@
+
+#> language
+path: '/v1/reverse?point.lat=1&point.lon=2'
+
+#? 200 ok
+response.statusCode.should.be.equal 200
+response.should.have.header 'charset', 'utf8'
+response.should.have.header 'content-type', 'application/json; charset=utf-8'
+
+#? valid geocoding block
+should.exist json.geocoding
+should.exist json.geocoding.version
+should.exist json.geocoding.attribution
+should.exist json.geocoding.query
+should.exist json.geocoding.engine
+should.exist json.geocoding.engine.name
+should.exist json.geocoding.engine.author
+should.exist json.geocoding.engine.version
+should.exist json.geocoding.timestamp
+
+#? valid geojson
+json.type.should.be.equal 'FeatureCollection'
+json.features.should.be.instanceof Array
+
+#? expected errors
+should.not.exist json.geocoding.errors
+
+#? expected warnings
+should.not.exist json.geocoding.warnings
+
+#? language
+json.geocoding.query['lang'].should.eql {
+  name: 'English',
+  iso6391: 'en',
+  iso6393: 'eng',
+  defaulted: true
+}
diff --git a/test/ciao/reverse/language_header_invalid.coffee b/test/ciao/reverse/language_header_invalid.coffee
new file mode 100644
index 00000000..635de4e1
--- /dev/null
+++ b/test/ciao/reverse/language_header_invalid.coffee
@@ -0,0 +1,38 @@
+
+#> language
+path: '/v1/reverse?point.lat=1&point.lon=2'
+headers: 'Accept-Language': 'example'
+
+#? 200 ok
+response.statusCode.should.be.equal 200
+response.should.have.header 'charset', 'utf8'
+response.should.have.header 'content-type', 'application/json; charset=utf-8'
+
+#? valid geocoding block
+should.exist json.geocoding
+should.exist json.geocoding.version
+should.exist json.geocoding.attribution
+should.exist json.geocoding.query
+should.exist json.geocoding.engine
+should.exist json.geocoding.engine.name
+should.exist json.geocoding.engine.author
+should.exist json.geocoding.engine.version
+should.exist json.geocoding.timestamp
+
+#? valid geojson
+json.type.should.be.equal 'FeatureCollection'
+json.features.should.be.instanceof Array
+
+#? expected errors
+should.not.exist json.geocoding.errors
+
+#? expected warnings
+should.not.exist json.geocoding.warnings
+
+#? language
+json.geocoding.query['lang'].should.eql {
+  name: 'English',
+  iso6391: 'en',
+  iso6393: 'eng',
+  defaulted: true
+}
diff --git a/test/ciao/reverse/language_header_valid.coffee b/test/ciao/reverse/language_header_valid.coffee
new file mode 100644
index 00000000..bca45c1a
--- /dev/null
+++ b/test/ciao/reverse/language_header_valid.coffee
@@ -0,0 +1,38 @@
+
+#> language
+path: '/v1/reverse?point.lat=1&point.lon=2'
+headers: 'Accept-Language': 'fr-CH, fr;q=0.9, en;q=0.8, de;q=0.7, *;q=0.5'
+
+#? 200 ok
+response.statusCode.should.be.equal 200
+response.should.have.header 'charset', 'utf8'
+response.should.have.header 'content-type', 'application/json; charset=utf-8'
+
+#? valid geocoding block
+should.exist json.geocoding
+should.exist json.geocoding.version
+should.exist json.geocoding.attribution
+should.exist json.geocoding.query
+should.exist json.geocoding.engine
+should.exist json.geocoding.engine.name
+should.exist json.geocoding.engine.author
+should.exist json.geocoding.engine.version
+should.exist json.geocoding.timestamp
+
+#? valid geojson
+json.type.should.be.equal 'FeatureCollection'
+json.features.should.be.instanceof Array
+
+#? expected errors
+should.not.exist json.geocoding.errors
+
+#? expected warnings
+should.not.exist json.geocoding.warnings
+
+#? language
+json.geocoding.query['lang'].should.eql {
+  defaulted: false,
+  iso6391: 'fr',
+  iso6393: 'fra',
+  name: 'French'
+}
diff --git a/test/ciao/search/language_default.coffee b/test/ciao/search/language_default.coffee
new file mode 100644
index 00000000..eb85265c
--- /dev/null
+++ b/test/ciao/search/language_default.coffee
@@ -0,0 +1,37 @@
+
+#> language
+path: '/v1/search?text=example'
+
+#? 200 ok
+response.statusCode.should.be.equal 200
+response.should.have.header 'charset', 'utf8'
+response.should.have.header 'content-type', 'application/json; charset=utf-8'
+
+#? valid geocoding block
+should.exist json.geocoding
+should.exist json.geocoding.version
+should.exist json.geocoding.attribution
+should.exist json.geocoding.query
+should.exist json.geocoding.engine
+should.exist json.geocoding.engine.name
+should.exist json.geocoding.engine.author
+should.exist json.geocoding.engine.version
+should.exist json.geocoding.timestamp
+
+#? valid geojson
+json.type.should.be.equal 'FeatureCollection'
+json.features.should.be.instanceof Array
+
+#? expected errors
+should.not.exist json.geocoding.errors
+
+#? expected warnings
+should.not.exist json.geocoding.warnings
+
+#? language
+json.geocoding.query['lang'].should.eql {
+  name: 'English',
+  iso6391: 'en',
+  iso6393: 'eng',
+  defaulted: true
+}
diff --git a/test/ciao/search/language_header_invalid.coffee b/test/ciao/search/language_header_invalid.coffee
new file mode 100644
index 00000000..af89aaf0
--- /dev/null
+++ b/test/ciao/search/language_header_invalid.coffee
@@ -0,0 +1,38 @@
+
+#> language
+path: '/v1/search?text=example'
+headers: 'Accept-Language': 'example'
+
+#? 200 ok
+response.statusCode.should.be.equal 200
+response.should.have.header 'charset', 'utf8'
+response.should.have.header 'content-type', 'application/json; charset=utf-8'
+
+#? valid geocoding block
+should.exist json.geocoding
+should.exist json.geocoding.version
+should.exist json.geocoding.attribution
+should.exist json.geocoding.query
+should.exist json.geocoding.engine
+should.exist json.geocoding.engine.name
+should.exist json.geocoding.engine.author
+should.exist json.geocoding.engine.version
+should.exist json.geocoding.timestamp
+
+#? valid geojson
+json.type.should.be.equal 'FeatureCollection'
+json.features.should.be.instanceof Array
+
+#? expected errors
+should.not.exist json.geocoding.errors
+
+#? expected warnings
+should.not.exist json.geocoding.warnings
+
+#? language
+json.geocoding.query['lang'].should.eql {
+  name: 'English',
+  iso6391: 'en',
+  iso6393: 'eng',
+  defaulted: true
+}
diff --git a/test/ciao/search/language_header_valid.coffee b/test/ciao/search/language_header_valid.coffee
new file mode 100644
index 00000000..4f3b958d
--- /dev/null
+++ b/test/ciao/search/language_header_valid.coffee
@@ -0,0 +1,38 @@
+
+#> language
+path: '/v1/search?text=example'
+headers: 'Accept-Language': 'fr-CH, fr;q=0.9, en;q=0.8, de;q=0.7, *;q=0.5'
+
+#? 200 ok
+response.statusCode.should.be.equal 200
+response.should.have.header 'charset', 'utf8'
+response.should.have.header 'content-type', 'application/json; charset=utf-8'
+
+#? valid geocoding block
+should.exist json.geocoding
+should.exist json.geocoding.version
+should.exist json.geocoding.attribution
+should.exist json.geocoding.query
+should.exist json.geocoding.engine
+should.exist json.geocoding.engine.name
+should.exist json.geocoding.engine.author
+should.exist json.geocoding.engine.version
+should.exist json.geocoding.timestamp
+
+#? valid geojson
+json.type.should.be.equal 'FeatureCollection'
+json.features.should.be.instanceof Array
+
+#? expected errors
+should.not.exist json.geocoding.errors
+
+#? expected warnings
+should.not.exist json.geocoding.warnings
+
+#? language
+json.geocoding.query['lang'].should.eql {
+  defaulted: false,
+  iso6391: 'fr',
+  iso6393: 'fra',
+  name: 'French'
+}