diff --git a/pages/api/file/getawaitingsubmissionfromblob.js b/pages/api/file/getawaitingsubmissionfromblob.js
index 86f0a0f0..c1949040 100644
--- a/pages/api/file/getawaitingsubmissionfromblob.js
+++ b/pages/api/file/getawaitingsubmissionfromblob.js
@@ -14,16 +14,21 @@ ApiProxy.get(async (req, res) => {
     var containerName = req.query.container;
     var checkHash = req.query.hash;
 
+    if (
+        typeof containerName === "undefined" ||
+        containerName.length === 0 ||
+        typeof checkHash === "undefined" ||
+        checkHash.length === 0
+    ) {
+        return res.status(400).json();
+    }
+
     var checkquerypath =
         "/api/file/getawaitingsubmissionfromblob?container=" + containerName;
 
-    // console.log(
-    //     "///////////////////////\ngetawaitingsubmissionblob url :",
-    //     req.url,
-    //     "\n///////////////////////\n"
-    // );
-    //console.log(hashAPIPath(checkquerypath), checkHash);
-    //console.log(hashAPIPath(checkquerypath) == "&hash=" + checkHash);
+    if (hashAPIPath(checkquerypath) != "&hash=" + checkHash) {
+        return res.status(400).json();
+    }
 
     if (hashAPIPath(checkquerypath) == "&hash=" + checkHash) {
         const blobObj = await getAllProgressBlobs(containerName)
@@ -33,8 +38,6 @@ ApiProxy.get(async (req, res) => {
             .then((data) => {
                 return res.status(200).json(data);
             });
-    } else {
-        return res.status(400).json();
     }
 });
 
diff --git a/pages/api/file/getprogressobjblob.js b/pages/api/file/getprogressobjblob.js
index aac8bfd5..8f5ef041 100644
--- a/pages/api/file/getprogressobjblob.js
+++ b/pages/api/file/getprogressobjblob.js
@@ -15,23 +15,31 @@ ApiProxy.get(async (req, res) => {
     var casefolderID = req.query.casefolderID;
 
     var checkHash = req.query.hash;
+
+    if (
+        typeof containerName === "undefined" ||
+        containerName.length === 0 ||
+        typeof casefolderID === "undefined" ||
+        casefolderID.length === 0 ||
+        typeof checkHash === "undefined" ||
+        checkHash.length === 0
+    ) {
+        return res.status(400).json();
+    }
+
     var checkquerypath =
         "/api/file/getprogressobjblob?container=" +
         containerName +
         "&casefolderID=" +
         casefolderID;
 
-    // console.log("-----", casefolderID);
-    // console.log("-----", req.query);
-    // console.log("-----", checkquerypath);
-    // console.log("-----", hashAPIPath(checkquerypath));
-    // console.log("-----", checkHash);
-    // console.log(hashAPIPath(checkquerypath) == "&hash=" + checkHash);
+    if (hashAPIPath(checkquerypath) != "&hash=" + checkHash) {
+        return res.status(400).json();
+    }
 
     if (hashAPIPath(checkquerypath) == "&hash=" + checkHash) {
         const blobObj = await getProgressBlobs(containerName, casefolderID)
             .then((data) => {
-                //console.log("Progress blob path:", data.path);
                 return downloadProgressFile(
                     containerName,
                     data.path,
@@ -41,8 +49,6 @@ ApiProxy.get(async (req, res) => {
             .then((data) => {
                 return res.status(200).json(data);
             });
-    } else {
-        return res.status(400).json();
     }
 });
 
diff --git a/pages/api/file/getrepsblob.js b/pages/api/file/getrepsblob.js
index 51bf1df3..2a9116e7 100644
--- a/pages/api/file/getrepsblob.js
+++ b/pages/api/file/getrepsblob.js
@@ -47,14 +47,23 @@ ApiProxy.get(async (req, res) => {
     var casefolderID = req.query.casefolderID;
 
     var checkHash = req.query.hash;
+
+    if (
+        typeof containerName === "undefined" ||
+        containerName.length === 0 ||
+        typeof casefolderID === "undefined" ||
+        casefolderID.length === 0 ||
+        typeof checkHash === "undefined" ||
+        checkHash.length === 0
+    ) {
+        return res.status(400).json();
+    }
+
     var checkquerypath = "/api/file/getrepsblob?container=" + containerName;
 
-    //console.log("-----", casefolderID);
-    //console.log("-----", req.query);
-    //console.log("-----", checkquerypath);
-    //console.log("-----", hashAPIPath(checkquerypath));
-    //console.log("-----", checkHash);
-    //console.log(hashAPIPath(checkquerypath) == "&hash=" + checkHash);
+    if (hashAPIPath(checkquerypath) != "&hash=" + checkHash) {
+        return res.status(400).json();
+    }
 
     if (hashAPIPath(checkquerypath) == "&hash=" + checkHash) {
         const blobObj = await getRepsBlobs(containerName, casefolderID)
@@ -72,8 +81,6 @@ ApiProxy.get(async (req, res) => {
             .catch((error) => {
                 consoleLogger(error);
             });
-    } else {
-        return res.status(400).json();
     }
 });
 
diff --git a/tests/phase10/service-behaviour.test.cjs b/tests/phase10/service-behaviour.test.cjs
new file mode 100644
index 00000000..c034b001
--- /dev/null
+++ b/tests/phase10/service-behaviour.test.cjs
@@ -0,0 +1,236 @@
+const fs = require("fs");
+const path = require("path");
+const vm = require("vm");
+const assert = require("assert");
+
+const rootDir = path.resolve(__dirname, "..", "..");
+
+const loadModule = (relativePath, injected = {}) => {
+    const filePath = path.join(rootDir, relativePath);
+    let source = fs.readFileSync(filePath, "utf8");
+
+    source = source.replace(/import[\s\S]*?from\s+"[^"]+";\n?/g, "");
+    source = source.replace(
+        /export default async function\s+(\w+)\s*\(/,
+        "async function $1("
+    );
+    source = source.replace(/export const\s+/g, "const ");
+    source = source.replace(
+        /export default\s+(\w+);/g,
+        "module.exports.default = $1;"
+    );
+
+    source +=
+        '\nif (typeof ApiProxy !== "undefined" && !module.exports.default) module.exports.default = ApiProxy;\n';
+
+    const context = {
+        module: { exports: {} },
+        exports: {},
+        require,
+        process,
+        console: {
+            log: () => {},
+            info: () => {},
+            warn: () => {},
+            error: () => {}
+        },
+        ...injected
+    };
+
+    vm.runInNewContext(source, context, { filename: filePath });
+    return context.module.exports;
+};
+
+const createNextConnectMock = () => {
+    const router = {
+        handler: null,
+        use: () => {},
+        get(fn) {
+            this.handler = fn;
+        }
+    };
+
+    return () => router;
+};
+
+const createRes = () => {
+    const state = {
+        statusCode: null,
+        jsonBody: undefined
+    };
+
+    return {
+        state,
+        setHeader: () => {},
+        status(code) {
+            state.statusCode = code;
+            return this;
+        },
+        json(payload) {
+            state.jsonBody = payload;
+            return payload;
+        }
+    };
+};
+
+const tests = [];
+const test = (name, fn) => tests.push({ name, fn });
+
+test("getawaitingsubmissionfromblob rejects missing hash with 400", async () => {
+    const calls = [];
+    const nextConnect = createNextConnectMock();
+
+    const mod = loadModule("pages/api/file/getawaitingsubmissionfromblob.js", {
+        hashAPIPath: () => "&hash=expected",
+        getAllProgressBlobs: async (...args) => {
+            calls.push(args);
+            return [];
+        },
+        downloadAllProgressFiles: async () => [],
+        _: { isEmpty: (value) => !value },
+        nextConnect,
+        middleware: () => {}
+    });
+
+    const req = { query: { container: "c1" } };
+    const res = createRes();
+
+    await mod.default.handler(req, res);
+
+    assert.strictEqual(res.state.statusCode, 400);
+    assert.strictEqual(calls.length, 0);
+});
+
+test("getprogressobjblob rejects missing casefolderID with 400", async () => {
+    const calls = [];
+    const nextConnect = createNextConnectMock();
+
+    const mod = loadModule("pages/api/file/getprogressobjblob.js", {
+        hashAPIPath: () => "&hash=expected",
+        getProgressBlobs: async (...args) => {
+            calls.push(args);
+            return { path: "x" };
+        },
+        downloadProgressFile: async () => ({}),
+        _: { isEmpty: (value) => !value },
+        nextConnect,
+        middleware: () => {}
+    });
+
+    const req = {
+        query: { container: "c1", hash: "expected" }
+    };
+    const res = createRes();
+
+    await mod.default.handler(req, res);
+
+    assert.strictEqual(res.state.statusCode, 400);
+    assert.strictEqual(calls.length, 0);
+});
+
+test("getbloblist rejects invalid hash with 400", async () => {
+    const calls = [];
+    const nextConnect = createNextConnectMock();
+
+    const mod = loadModule("pages/api/file/getbloblist.js", {
+        hashAPIPath: () => "&hash=expected",
+        getBlobs: async (...args) => {
+            calls.push(args);
+            return [];
+        },
+        getRepsFilesBlobs: async () => [],
+        nextConnect,
+        middleware: () => {}
+    });
+
+    const req = {
+        query: {
+            container: "c1",
+            casefolderID: "case-1",
+            hash: "wrong"
+        }
+    };
+    const res = createRes();
+
+    await mod.default.handler(req, res);
+
+    assert.strictEqual(res.state.statusCode, 400);
+    assert.strictEqual(calls.length, 0);
+});
+
+test("getrepsblob rejects missing hash with 400", async () => {
+    const calls = [];
+    const nextConnect = createNextConnectMock();
+
+    const mod = loadModule("pages/api/file/getrepsblob.js", {
+        hashAPIPath: () => "&hash=expected",
+        getRepsBlobs: async (...args) => {
+            calls.push(args);
+            return [];
+        },
+        downloadAllRepsFiles: async () => [],
+        consoleLogger: () => {},
+        _: { isEmpty: (value) => !value },
+        nextConnect,
+        middleware: () => {}
+    });
+
+    const req = {
+        query: {
+            container: "c1",
+            casefolderID: "case-1"
+        }
+    };
+    const res = createRes();
+
+    await mod.default.handler(req, res);
+
+    assert.strictEqual(res.state.statusCode, 400);
+    assert.strictEqual(calls.length, 0);
+});
+
+test("getbloblist happy path with valid hash returns 200", async () => {
+    const nextConnect = createNextConnectMock();
+
+    const mod = loadModule("pages/api/file/getbloblist.js", {
+        hashAPIPath: () => "&hash=expected",
+        getBlobs: async () => ["file-1"],
+        getRepsFilesBlobs: async () => ["file-rep"],
+        nextConnect,
+        middleware: () => {}
+    });
+
+    const req = {
+        query: {
+            container: "c1",
+            casefolderID: "case-1",
+            hash: "expected"
+        }
+    };
+    const res = createRes();
+
+    await mod.default.handler(req, res);
+
+    assert.strictEqual(res.state.statusCode, 200);
+    assert.deepStrictEqual(JSON.parse(JSON.stringify(res.state.jsonBody)), {
+        value: [["file-1"]]
+    });
+});
+
+const run = async () => {
+    let passed = 0;
+
+    for (const currentTest of tests) {
+        await currentTest.fn();
+        passed += 1;
+    }
+
+    console.log(
+        `Phase 10 behavioural tests passed (${passed}/${tests.length}).`
+    );
+};
+
+run().catch((error) => {
+    console.error(error);
+    process.exit(1);
+});