diff --git a/lib/galaxy/jobs/__init__.py b/lib/galaxy/jobs/__init__.py
index bc3687eef2e..6522f2c3035 100644
--- a/lib/galaxy/jobs/__init__.py
+++ b/lib/galaxy/jobs/__init__.py
@@ -1391,6 +1391,7 @@ class JobWrapper(object, HasResourceParameters):
         }
         self.tool.collect_dynamic_collections(
             out_collections,
+            self.get_tool_provided_job_metadata(),
             job_working_directory=tool_working_directory,
             inp_data=inp_data,
             job=job,
diff --git a/lib/galaxy/tools/__init__.py b/lib/galaxy/tools/__init__.py
index 6f4ca1c275d..0d62277bc33 100755
--- a/lib/galaxy/tools/__init__.py
+++ b/lib/galaxy/tools/__init__.py
@@ -1638,10 +1638,10 @@ class Tool(object, Dictifiable):
         """
         return output_collect.collect_primary_datasets(self, output, tool_provided_metadata, job_working_directory, input_ext, input_dbkey=input_dbkey)
 
-    def collect_dynamic_collections(self, output, **kwds):
+    def collect_dynamic_collections(self, output, tool_provided_metadata, **kwds):
         """ Find files corresponding to dynamically structured collections.
         """
-        return output_collect.collect_dynamic_collections(self, output, **kwds)
+        return output_collect.collect_dynamic_collections(self, output, tool_provided_metadata, **kwds)
 
     def to_archive(self):
         tool = self
diff --git a/lib/galaxy/tools/parameters/output_collect.py b/lib/galaxy/tools/parameters/output_collect.py
index fc457a0c394..9b30b937abb 100644
--- a/lib/galaxy/tools/parameters/output_collect.py
+++ b/lib/galaxy/tools/parameters/output_collect.py
@@ -7,6 +7,8 @@ import operator
 import os
 import re
 
+from collections import namedtuple
+
 from galaxy import util
 from galaxy.tools.parser.output_collection_def import (
     DEFAULT_DATASET_COLLECTOR_DESCRIPTION,
@@ -23,7 +25,9 @@ log = logging.getLogger(__name__)
 
 
 class NullToolProvidedMetadata(object):
-    pass
+
+    def get_new_datasets(self, output_name):
+        return []
 
     def get_new_dataset_meta_by_basename(self, output_name, basename):
         return {}
@@ -66,6 +70,10 @@ class LegacyToolProvidedMetadata(object):
             if meta['type'] == 'new_primary_dataset' and meta['filename'] == basename:
                 return meta
 
+    def get_new_datasets(self, output_name):
+        log.warning("Called get_new_datasets with legacy tool metadata provider - that is unimplemented.")
+        return []
+
 
 class ToolProvidedMetadata(object):
 
@@ -83,10 +91,15 @@ class ToolProvidedMetadata(object):
             if meta['filename'] == basename:
                 return meta
 
+    def get_new_datasets(self, output_name):
+        datasets = self.tool_provided_job_metadata.get(output_name, {}).get("datasets", [])
+        return datasets
+
 
 def collect_dynamic_collections(
     tool,
     output_collections,
+    tool_provided_metadata,
     job_working_directory,
     inp_data={},
     job=None,
@@ -95,6 +108,7 @@ def collect_dynamic_collections(
     collections_service = tool.app.dataset_collections_service
     job_context = JobContext(
         tool,
+        tool_provided_metadata,
         job,
         job_working_directory,
         inp_data,
@@ -132,13 +146,14 @@ def collect_dynamic_collections(
 
 class JobContext(object):
 
-    def __init__(self, tool, job, job_working_directory, inp_data, input_dbkey):
+    def __init__(self, tool, tool_provided_metadata, job, job_working_directory, inp_data, input_dbkey):
         self.inp_data = inp_data
         self.input_dbkey = input_dbkey
         self.app = tool.app
         self.sa_session = tool.sa_session
         self.job = job
         self.job_working_directory = job_working_directory
+        self.tool_provided_metadata = tool_provided_metadata
 
     @property
     def permissions(self):
@@ -151,10 +166,10 @@ class JobContext(object):
             permissions = self.app.security_agent.history_get_default_permissions(self.job.history)
         return permissions
 
-    def find_files(self, collection, dataset_collectors):
+    def find_files(self, output_name, collection, dataset_collectors):
         filenames = odict.odict()
-        for path, extra_file_collector in walk_over_extra_files(dataset_collectors, self.job_working_directory, collection):
-            filenames[path] = extra_file_collector
+        for discovered_file in discover_files(output_name, self.tool_provided_metadata, dataset_collectors, self.job_working_directory, collection):
+            filenames[discovered_file.path] = discovered_file
         return filenames
 
     def populate_collection_elements(self, collection, root_collection_builder, output_collection_def):
@@ -164,12 +179,13 @@ class JobContext(object):
         #    <sort regex="example.(\d+).fastq" by="1:numerical" />
         #    <sort regex="part_(\d+)_sample_([^_]+).fastq" by="2:lexical,1:numerical" />
         dataset_collectors = map(dataset_collector, output_collection_def.dataset_collector_descriptions)
-        filenames = self.find_files(collection, dataset_collectors)
+        output_name = output_collection_def.name
+        filenames = self.find_files(output_name, collection, dataset_collectors)
 
         element_datasets = []
-        for filename, extra_file_collector in filenames.items():
+        for filename, discovered_file in filenames.items():
             create_dataset_timer = ExecutionTimer()
-            fields_match = extra_file_collector.match(collection, os.path.basename(filename))
+            fields_match = discovered_file.match
             if not fields_match:
                 raise Exception("Problem parsing metadata fields for file %s" % filename)
             element_identifiers = fields_match.element_identifiers
@@ -292,8 +308,7 @@ def collect_primary_datasets(tool, output, tool_provided_metadata, job_working_d
         # This should not be considered an error or warning condition, this file is optional
         pass
     # Loop through output file names, looking for generated primary
-    # datasets in form of:
-    #     'primary_associatedWithDatasetID_designation_visibility_extension(_DBKEY)'
+    # datasets in form specified by discover dataset patterns or in tool provided metadata.
     primary_output_assigned = False
     new_outdata_name = None
     primary_datasets = {}
@@ -306,12 +321,17 @@ def collect_primary_datasets(tool, output, tool_provided_metadata, job_working_d
                 # only use old-style matching (glob instead of regex and only
                 # using default collector - if enabled).
                 for filename in glob.glob(os.path.join(app.config.new_file_path, "primary_%i_*" % outdata.id)):
-                    filenames[filename] = DEFAULT_DATASET_COLLECTOR
+                    filenames[filename] = DiscoveredFile(
+                        filename,
+                        DEFAULT_DATASET_COLLECTOR,
+                        DEFAULT_DATASET_COLLECTOR.match(outdata, os.path.basename(filename))
+                    )
         if 'job_working_directory' in app.config.collect_outputs_from:
-            for path, extra_file_collector in walk_over_extra_files(dataset_collectors, job_working_directory, outdata):
-                filenames[path] = extra_file_collector
-        for filename_index, (filename, extra_file_collector) in enumerate(filenames.items()):
-            fields_match = extra_file_collector.match(outdata, os.path.basename(filename))
+            for discovered_file in discover_files(name, tool_provided_metadata, dataset_collectors, job_working_directory, outdata):
+                filenames[discovered_file.path] = discovered_file
+        for filename_index, (filename, discovered_file) in enumerate(filenames.items()):
+            extra_file_collector = discovered_file.collector
+            fields_match = discovered_file.match
             if not fields_match:
                 # Before I guess pop() would just have thrown an IndexError
                 raise Exception("Problem parsing metadata fields for file %s" % filename)
@@ -411,14 +431,39 @@ def collect_primary_datasets(tool, output, tool_provided_metadata, job_working_d
     return primary_datasets
 
 
+DiscoveredFile = namedtuple('DiscoveredFile', ['path', 'collector', 'match'])
+
+
+def discover_files(output_name, tool_provided_metadata, extra_file_collectors, job_working_directory, matchable):
+    if extra_file_collectors and extra_file_collectors[0].discover_via == "tool_provided_metadata":
+        # just load entries from tool provided metadata...
+        assert len(extra_file_collectors) == 1
+        extra_file_collector = extra_file_collectors[0]
+        target_directory = discover_target_directory(extra_file_collector, job_working_directory)
+        for dataset in tool_provided_metadata.get_new_datasets(output_name):
+            filename = dataset["filename"]
+            path = os.path.join(target_directory, filename)
+            yield DiscoveredFile(path, extra_file_collector, JsonCollectedDatasetMatch(dataset, extra_file_collector, filename, path=path))
+    else:
+        for (match, collector) in walk_over_extra_files(extra_file_collectors, job_working_directory, matchable):
+            yield DiscoveredFile(match.path, collector, match)
+
+
+def discover_target_directory(extra_file_collector, job_working_directory):
+    directory = job_working_directory
+    if extra_file_collector.directory:
+        directory = os.path.join(directory, extra_file_collector.directory)
+        if not util.in_directory(directory, job_working_directory):
+            raise Exception("Problem with tool configuration, attempting to pull in datasets from outside working directory.")
+    return directory
+
+
 def walk_over_extra_files(extra_file_collectors, job_working_directory, matchable):
+
     for extra_file_collector in extra_file_collectors:
+        assert extra_file_collector.discover_via == "pattern"
         matches = []
-        directory = job_working_directory
-        if extra_file_collector.directory:
-            directory = os.path.join(directory, extra_file_collector.directory)
-            if not util.in_directory(directory, job_working_directory):
-                raise Exception("Problem with tool configuration, attempting to pull in datasets from outside working directory.")
+        directory = discover_target_directory(extra_file_collector, job_working_directory)
         if not os.path.isdir(directory):
             continue
         for filename in os.listdir(directory):
@@ -430,7 +475,7 @@ def walk_over_extra_files(extra_file_collectors, job_working_directory, matchabl
                 matches.append(match)
 
         for match in extra_file_collector.sort(matches):
-            yield match.path, extra_file_collector
+            yield match, extra_file_collector
 
 
 def dataset_collector(dataset_collection_description):
@@ -439,12 +484,27 @@ def dataset_collector(dataset_collection_description):
         # treated like a singleton.
         return DEFAULT_DATASET_COLLECTOR
     else:
-        return DatasetCollector(dataset_collection_description)
+        if dataset_collection_description.discover_via == "pattern":
+            return DatasetCollector(dataset_collection_description)
+        else:
+            return ToolMetadataDatasetCollector(dataset_collection_description)
+
+
+class ToolMetadataDatasetCollector(object):
+
+    def __init__(self, dataset_collection_description):
+        self.discover_via = dataset_collection_description.discover_via
+        self.default_dbkey = dataset_collection_description.default_dbkey
+        self.default_ext = dataset_collection_description.default_ext
+        self.default_visible = dataset_collection_description.default_visible
+        self.directory = dataset_collection_description.directory
+        self.assign_primary_output = dataset_collection_description.assign_primary_output
 
 
 class DatasetCollector(object):
 
     def __init__(self, dataset_collection_description):
+        self.discover_via = dataset_collection_description.discover_via
         # dataset_collection_description is an abstract description
         # built from the tool parsing module - see galaxy.tools.parser.output_colleciton_def
         self.sort_key = dataset_collection_description.sort_key
@@ -457,18 +517,18 @@ class DatasetCollector(object):
         self.directory = dataset_collection_description.directory
         self.assign_primary_output = dataset_collection_description.assign_primary_output
 
-    def pattern_for_dataset(self, dataset_instance=None):
+    def _pattern_for_dataset(self, dataset_instance=None):
         token_replacement = r'\d+'
         if dataset_instance:
             token_replacement = str(dataset_instance.id)
         return self.pattern.replace(DATASET_ID_TOKEN, token_replacement)
 
     def match(self, dataset_instance, filename, path=None):
-        pattern = self.pattern_for_dataset(dataset_instance)
+        pattern = self._pattern_for_dataset(dataset_instance)
         re_match = re.match(pattern, filename)
         match_object = None
         if re_match:
-            match_object = CollectedDatasetMatch(re_match, self, filename, path=path)
+            match_object = RegexCollectedDatasetMatch(re_match, self, filename, path=path)
         return match_object
 
     def sort(self, matches):
@@ -488,7 +548,80 @@ def _compose(f, g):
     return lambda x: f(g(x))
 
 
-class CollectedDatasetMatch(object):
+class JsonCollectedDatasetMatch(object):
+
+    def __init__(self, as_dict, collector, filename, path=None):
+        self.as_dict = as_dict
+        self.collector = collector
+        self.filename = filename
+        self.path = path
+
+    @property
+    def designation(self):
+        # If collecting nested collection, grap identifier_0,
+        # identifier_1, etc... and join on : to build designation.
+        element_identifiers = self.raw_element_identifiers
+        if element_identifiers:
+            return ":".join(element_identifiers)
+        elif "designation" in self.as_dict:
+            return self.as_dict.get("designation")
+        elif "name" in self.as_dict:
+            return self.as_dict.get("name")
+        else:
+            return None
+
+    @property
+    def element_identifiers(self):
+        return self.raw_element_identifiers or [self.designation]
+
+    @property
+    def raw_element_identifiers(self):
+        identifiers = []
+        i = 0
+        while True:
+            key = "identifier_%d" % i
+            if key in self.as_dict:
+                identifiers.append(self.as_dict.get(key))
+            else:
+                break
+            i += 1
+
+        return identifiers
+
+    @property
+    def name(self):
+        """ Return name or None if not defined by the discovery pattern.
+        """
+        name = None
+        if "name" in self.as_dict:
+            name = self.as_dict.get("name")
+        return name
+
+    @property
+    def dbkey(self):
+        try:
+            return self.as_dict["dbkey"]
+        except KeyError:
+            return self.collector.default_dbkey
+
+    @property
+    def ext(self):
+        try:
+            return self.as_dict["ext"]
+        except KeyError:
+            return self.collector.default_ext
+
+    @property
+    def visible(self):
+        try:
+            return self.as_dict["visible"].lower() == "visible"
+        except KeyError:
+            return self.collector.default_visible
+
+
+class RegexCollectedDatasetMatch(object):
+    # TODO: This could probably subclass JsonCollectedDatasetMatch if group dict is
+    # treated the same as the JSON dict.
 
     def __init__(self, re_match, collector, filename, path=None):
         self.re_match = re_match
diff --git a/lib/galaxy/tools/parser/output_collection_def.py b/lib/galaxy/tools/parser/output_collection_def.py
index 8c79d49e5f7..42c07faf533 100644
--- a/lib/galaxy/tools/parser/output_collection_def.py
+++ b/lib/galaxy/tools/parser/output_collection_def.py
@@ -25,31 +25,62 @@ LEGACY_DEFAULT_DBKEY = None  # don't use __input__ for legacy default collection
 
 def dataset_collector_descriptions_from_elem(elem, legacy=True):
     primary_dataset_elems = elem.findall("discover_datasets")
-    if len(primary_dataset_elems) == 0 and legacy:
-        return [DEFAULT_DATASET_COLLECTOR_DESCRIPTION]
+    num_discover_dataset_blocks = len(primary_dataset_elems)
+    if num_discover_dataset_blocks == 0 and legacy:
+        collectors = [DEFAULT_DATASET_COLLECTOR_DESCRIPTION]
     else:
-        return map(lambda elem: DatasetCollectionDescription(**elem.attrib), primary_dataset_elems)
+        collectors = map(lambda elem: dataset_collection_description(**elem.attrib), primary_dataset_elems)
+
+    if num_discover_dataset_blocks > 1:
+        for collector in collectors:
+            if collector.discover_via == "tool_provided_metadata":
+                raise Exception("Cannot specify more than one discover dataset condition if any of them specify tool_provided_metadata.")
+
+    return collectors
 
 
 def dataset_collector_descriptions_from_list(discover_datasets_dicts):
-    return map(lambda kwds: DatasetCollectionDescription(**kwds), discover_datasets_dicts)
+    return map(lambda kwds: dataset_collection_description(**kwds), discover_datasets_dicts)
+
+
+def dataset_collection_description(**kwargs):
+    if asbool(kwargs.get("from_provided_metadata", False)):
+        for key in ["pattern", "sort_by"]:
+            if kwargs.get(key):
+                raise Exception("Cannot specify attribute [%s] if from_provided_metadata is True" % key)
+        return ToolProvidedMetadataDatasetCollection(**kwargs)
+    else:
+        return FilePatternDatasetCollectionDescription(**kwargs)
 
 
 class DatasetCollectionDescription(object):
 
     def __init__(self, **kwargs):
-        pattern = kwargs.get("pattern", "__default__")
-        if pattern in NAMED_PATTERNS:
-            pattern = NAMED_PATTERNS.get(pattern)
-        self.pattern = pattern
         self.default_dbkey = kwargs.get("dbkey", INPUT_DBKEY_TOKEN)
         self.default_ext = kwargs.get("ext", None)
         if self.default_ext is None and "format" in kwargs:
             self.default_ext = kwargs.get("format")
         self.default_visible = asbool(kwargs.get("visible", None))
-        self.directory = kwargs.get("directory", None)
         self.assign_primary_output = asbool(kwargs.get('assign_primary_output', False))
-        sort_by = kwargs.get("sort_by", DEFAULT_SORT_BY)
+        self.directory = kwargs.get("directory", None)
+
+
+class ToolProvidedMetadataDatasetCollection(DatasetCollectionDescription):
+
+    discover_via = "tool_provided_metadata"
+
+
+class FilePatternDatasetCollectionDescription(DatasetCollectionDescription):
+
+    discover_via = "pattern"
+
+    def __init__( self, **kwargs ):
+        super(FilePatternDatasetCollectionDescription, self).__init__( **kwargs )
+        pattern = kwargs.get( "pattern", "__default__" )
+        if pattern in NAMED_PATTERNS:
+            pattern = NAMED_PATTERNS.get( pattern )
+        self.pattern = pattern
+        sort_by = kwargs.get( "sort_by", DEFAULT_SORT_BY )
         if sort_by.startswith("reverse_"):
             self.sort_reverse = True
             sort_by = sort_by[len("reverse_"):]
@@ -70,6 +101,6 @@ class DatasetCollectionDescription(object):
         self.sort_comp = sort_comp
 
 
-DEFAULT_DATASET_COLLECTOR_DESCRIPTION = DatasetCollectionDescription(
+DEFAULT_DATASET_COLLECTOR_DESCRIPTION = FilePatternDatasetCollectionDescription(
     default_dbkey=LEGACY_DEFAULT_DBKEY,
 )
diff --git a/lib/galaxy/tools/xsd/galaxy.xsd b/lib/galaxy/tools/xsd/galaxy.xsd
index 0abeed028e0..a6e350a2925 100644
--- a/lib/galaxy/tools/xsd/galaxy.xsd
+++ b/lib/galaxy/tools/xsd/galaxy.xsd
@@ -3873,6 +3873,11 @@ More information can be found on Planemo's documentation for
 [multiple output files](https://planemo.readthedocs.io/en/latest/writing_advanced.html#multiple-output-files).
 ]]></xs:documentation>
     </xs:annotation>
+    <xs:attribute name="from_provided_metadata" type="xs:boolean" use="optional">
+      <xs:annotation>
+        <xs:documentation xml:lang="en">Indicate that dataset filenames should simply be read from the provided metadata file (e.g. galaxy.json). If this is set - pattern and sort must not be set.</xs:documentation>
+      </xs:annotation>
+    </xs:attribute>
     <xs:attribute name="pattern" type="xs:string" use="required">
       <xs:annotation>
         <xs:documentation xml:lang="en">Regular expression used to find filenames and parse dynamic properties.</xs:documentation>
diff --git a/test/functional/tools/collection_creates_dynamic_nested_from_json.xml b/test/functional/tools/collection_creates_dynamic_nested_from_json.xml
new file mode 100644
index 00000000000..5cd6391f9b7
--- /dev/null
+++ b/test/functional/tools/collection_creates_dynamic_nested_from_json.xml
@@ -0,0 +1,78 @@
+<tool id="collection_creates_dynamic_nested_from_json" name="collection_creates_dynamic_nested_from_json" version="0.1.0" profile="17.09">
+  <command>
+    echo "A" > oe1_ie1.fq ;
+    echo "B" > oe1_ie2.fq ;
+    echo "C" > oe2_ie1.fq ;
+    echo "D" > oe2_ie2.fq ;
+    echo "E" > oe3_ie1.fq ;
+    echo "F" > oe3_ie2.fq ;
+    cp $c1 galaxy.json
+  </command>
+  <configfiles>
+      <configfile name="c1">{"list_output": {
+    "datasets": [
+      {"identifier_0": "oe1", "identifier_1": "ie1", "filename": "oe1_ie1.fq"},
+      {"identifier_0": "oe1", "identifier_1": "ie2", "filename": "oe1_ie2.fq"},
+      {"identifier_0": "oe2", "identifier_1": "ie1", "filename": "oe2_ie1.fq"},
+      {"identifier_0": "oe2", "identifier_1": "ie2", "filename": "oe2_ie2.fq"},
+      {"identifier_0": "oe3", "identifier_1": "ie1", "filename": "oe3_ie1.fq"},
+      {"identifier_0": "oe3", "identifier_1": "ie2", "filename": "oe3_ie2.fq"}
+]}}</configfile>
+  </configfiles>
+  <inputs>
+    <param name="foo" type="text" label="Dummy Parameter" />
+  </inputs>
+  <outputs>
+    <collection name="list_output" type="list:list" label="Duplicate List">
+      <!-- Use named regex group to grab pattern
+           <identifier_0>_<identifier_1>.fq. Here identifier_0 is the list
+           identifier of the outer list and identifier_1 is the list identifier
+           of the inner list (for instance oe1_ie2.fq in above example).
+      -->
+      <discover_datasets from_provided_metadata="true" ext="fastqsanger" visible="true" />
+    </collection>
+  </outputs>
+  <tests>
+    <test>
+      <param name="foo" value="bar" />
+      <output_collection name="list_output" type="list:list">
+        <element name="oe1">
+          <element name="ie1">
+            <assert_contents>
+              <has_text_matching expression="^A\n$" />
+            </assert_contents>
+          </element>
+          <element name="ie2">
+            <assert_contents>
+              <has_text_matching expression="^B\n$" />
+            </assert_contents>
+          </element>
+        </element>
+        <element name="oe2">
+          <element name="ie1">
+            <assert_contents>
+              <has_text_matching expression="^C\n$" />
+            </assert_contents>
+          </element>
+          <element name="ie2">
+            <assert_contents>
+              <has_text_matching expression="^D\n$" />
+            </assert_contents>
+          </element>
+        </element>
+        <element name="oe3">
+          <element name="ie1">
+            <assert_contents>
+              <has_text_matching expression="^E\n$" />
+            </assert_contents>
+          </element>
+          <element name="ie2">
+            <assert_contents>
+              <has_text_matching expression="^F\n$" />
+            </assert_contents>
+          </element>
+        </element>
+      </output_collection>
+    </test>
+  </tests>
+</tool>
diff --git a/test/functional/tools/samples_tool_conf.xml b/test/functional/tools/samples_tool_conf.xml
index dc612199ce8..4fa4feee5f0 100644
--- a/test/functional/tools/samples_tool_conf.xml
+++ b/test/functional/tools/samples_tool_conf.xml
@@ -21,6 +21,7 @@
   <tool file="tool_provided_metadata_4.xml" />
   <tool file="tool_provided_metadata_5.xml" />
   <tool file="tool_provided_metadata_6.xml" />
+  <tool file="tool_provided_metadata_7.xml" />
   <tool file="inputs_as_json.xml" />
   <tool file="dbkey_filter_input.xml" />
   <tool file="dbkey_filter_multi_input.xml" />
@@ -103,6 +104,7 @@
   <tool file="collection_optional_param.xml" />
   <tool file="collection_split_on_column.xml" />
   <tool file="collection_creates_dynamic_nested.xml" />
+  <tool file="collection_creates_dynamic_nested_from_json.xml" />
   <tool file="collection_creates_dynamic_list_of_pairs.xml" />
   <tool file="collection_type_source.xml" />
   <tool file="collection_creates_list_fail.xml" />
diff --git a/test/functional/tools/tool_provided_metadata_7.xml b/test/functional/tools/tool_provided_metadata_7.xml
new file mode 100644
index 00000000000..a50adbfe2c3
--- /dev/null
+++ b/test/functional/tools/tool_provided_metadata_7.xml
@@ -0,0 +1,43 @@
+<tool id="tool_provided_metadata_7" name="tool_provided_metadata_7" profile="17.09" version="1.0.0">
+  <!-- Demonstrate setting discovered dataset metadata via galaxy.json for profile >= 17.09 tools. -->
+  <command>
+    echo "1" > sample1.report.tsv;
+    echo "2" > sample2.report.tsv;
+    cp $c1 galaxy.json;
+  </command>
+  <configfiles>
+      <configfile name="c1">{"sample": {
+"datasets": [
+{"filename": "sample1.report.tsv", "designation": "sample1", "name": "cool name 1", "ext": "txt", "info": "cool 1 info", "dbkey": "hg19"},
+{"filename": "sample2.report.tsv", "designation": "sample2", "name": "cool name 2", "ext": "txt", "info": "cool 2 info", "dbkey": "hg19"}
+]
+}}
+</configfile>
+  </configfiles>
+  <inputs>
+    <param name="input" type="data" />
+  </inputs>
+  <outputs>
+    <data name="sample">
+      <discover_datasets from_provided_metadata="true" visible="true" />
+    </data>
+  </outputs>
+  <tests>
+    <test>
+      <param name="input" ftype="txt" value="simple_line.txt"/>
+      <output name="sample">
+        <discovered_dataset designation="sample1" ftype="txt">
+          <assert_contents><has_line line="1" /></assert_contents>
+          <metadata name="name" value="cool name 1" />
+          <metadata name="dbkey" value="hg19" />
+          <metadata name="info" value="cool 1 info" />
+        </discovered_dataset>
+        <discovered_dataset designation="sample2" ftype="txt">
+          <assert_contents><has_line line="2" /></assert_contents>
+          <metadata name="name" value="cool name 2" />
+          <metadata name="info" value="cool 2 info" />
+        </discovered_dataset>
+      </output>
+    </test>
+  </tests>
+</tool>