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diff --git a/tests/uploader/test_expression_data_pages.py b/tests/uploader/test_expression_data_pages.py
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+++ b/tests/uploader/test_expression_data_pages.py
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+"""Test expression data path"""
+import pytest
+
+from tests.conftest import uploadable_file_object
+
+def test_basic_elements_present_in_index_page(client):
+    """
+    GIVEN: A flask application testing client
+    WHEN: the index page is requested with the "GET" method and no data
+    THEN: verify that the response contains error notifications
+    """
+    response = client.get("/upload")
+    assert response.status_code == 200
+    ## form present
+    assert b'<form action="/upload"' in response.data
+    assert b'method="POST"' in response.data
+    assert b'enctype="multipart/form-data"' in response.data
+    assert b'</form>' in response.data
+    ## filetype elements
+    assert b'<input type="radio" name="filetype"' in response.data
+    assert b'id="filetype_standard_error"' in response.data
+    assert b'id="filetype_average"' in response.data
+    ## file upload elements
+    assert b'<label for="file_upload"' in response.data
+    assert b'select file' in response.data
+    assert b'<input type="file" name="qc_text_file"' in response.data
+    assert b'id="file_upload"' in response.data
+    ## submit button
+    assert b'<button type="submit"' in response.data
+
+
+def test_post_notifies_errors_if_no_data_is_provided(client):
+    """
+    GIVEN: A flask application testing client
+    WHEN: the index page is requested with the "POST" method and with no
+          data provided
+    THEN: ensure the system responds woit the appropriate error messages
+    """
+    response = client.post("/upload", data={}, follow_redirects=True)
+    assert len(response.history) == 1
+    redirect = response.history[0]
+    assert redirect.status_code == 302
+    assert redirect.location == "/upload"
+
+    assert response.status_code == 200
+    assert b'Invalid file type provided.' in response.data
+    assert b'No file was uploaded.' in response.data
+
+def test_post_with_correct_data(client):
+    """
+    GIVEN: A flask application testing client
+    WHEN: the index page is requested with the "POST" method and with the
+          appropriate data provided
+    THEN: ensure the system redirects to the parse endpoint with the filename
+          and filetype
+    """
+    response = client.post(
+        "/upload", data={
+            "speciesid": 1,
+            "filetype": "average",
+            "qc_text_file": uploadable_file_object("no_data_errors.tsv")
+        })
+
+    assert response.status_code == 302
+    assert b'Redirecting...' in response.data
+    assert (
+        b'/parse/parse?speciesid=1&amp;filename=no_data_errors.tsv&amp;filetype=average'
+        in response.data)
+
+
+@pytest.mark.parametrize(
+    "request_data,error_message",
+    (({"filetype": "invalid_choice",
+       "qc_text_file": uploadable_file_object("no_data_errors.tsv")},
+      b'Invalid file type provided.'),
+     ({"filetype": "average"}, b'No file was uploaded.'),
+     ({"filetype": "standard-error"}, b'No file was uploaded.')))
+def test_post_with_missing_or_invalid_data(client, request_data,error_message):
+    """
+    GIVEN: A flask application testing client
+    WHEN: the index page is requested with the "POST" method and with data
+          either being missing or invalid
+    THEN: ensure that the system responds with the appropriate error message
+    """
+    response = client.post("/upload", data=request_data, follow_redirects=True)
+    assert len(response.history) == 1
+    redirect = response.history[0]
+    assert redirect.status_code == 302
+    assert redirect.location == "/upload"
+
+    assert response.status_code == 200
+    assert error_message in response.data