First stab at documentation for the examples dir.

tests/examples/README.md

@@ -0,0 +1,68 @@
+# CAM Pipeline Test Examples
+
+This directory contains JSON files describing test cases that can be used to test a
+CAM Pipeline instance.
+
+## Test example format
+
+Every JSON file in this directory should be in the following format:
+
+```json
+{
+  "meta": {
+    "description": "A description of the test suite goes here."
+  }
+}
+```
+
+The following top-level keys are used. In general keys not listed here will be silently ignored.
+
+| Key                | Description                                                  | Examples                                                                              |
+|--------------------|--------------------------------------------------------------|---------------------------------------------------------------------------------------|
+| `meta`             | Metadata. In general you can stick whatever you like in here | `{ "description": "Add to them." }`                                                   |
+| `meta.description` | A description of this test example.                          | Chemicals decreasing the activity of epidermal growth factor receptor (NCBIGene:1956) |
+| `query`            | MUST be a TRAPI query.                                       | `{ "message": { "query_graph": ... }}`                                                |
+| `assertions`       | A list of tests that must pass during testing.               | `[]`                                                                                  |
+
+## Supported assertions
+
+These can be included in the `assertions` list.
+
+### ExpectedResultCounts
+
+This assertion tests whether we get back a certain number of results.
+
+* `type`: MUST be `ExpectedResultCounts`.
+* `description`: OPTIONAL. A description of what is being tested here.
+* `min`: The minimum number of expected results; getting fewer results than this will fail the test.
+* `max`: The maximum number of expected results; getting more results than this will fail the test.
+
+Example:
+
+```json
+{
+  "type": "ExpectedResultCounts",
+  "min": 35
+}
+```
+
+### ExpectedNodeResults
+
+This assertion retrieves the list of all results returned for a particular node, and
+asserts whether that list equals, includes or excludes certain identifiers.
+
+* `type`: MUST be `ExpectedNodeResults`.
+* `description`: OPTIONAL. A description of what is being tested here.
+* `node`: REQUIRED. The node ID being asserted against, e.g. `n1`.
+* `resultEquals`: The list of unique identifiers that the node MUST return in the results.
+* `resultIncludes`: A list of identifiers that MUST be included in the list of unique identifiers returned for a node.
+* `resultExcludes`: A list of identifiers that MUST NOT be included in the list of unique identifiers returned for a node.
+
+```json
+{
+  "type": "ExpectedNodeResults",
+  "node": "n0",
+  "resultEquals": ["GO:0005488"],
+  "description": "Expected binding (GO:0005488) to have valproic acid (PUBCHEM.COMPOUND:3121) as an input."
+}
+```