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diff --git a/devtools/client/debugger/src/utils/tests/build-query.spec.js b/devtools/client/debugger/src/utils/tests/build-query.spec.js
new file mode 100644
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+++ b/devtools/client/debugger/src/utils/tests/build-query.spec.js
@@ -0,0 +1,256 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import buildQuery from "../build-query";
+
+describe("build-query", () => {
+  it("case-sensitive, whole-word, regex search", () => {
+    const query = buildQuery(
+      "hi.*",
+      {
+        caseSensitive: true,
+        wholeWord: true,
+        regexMatch: true,
+      },
+      {}
+    );
+
+    expect(query.source).toBe("\\bhi.*\\b");
+    expect(query.flags).toBe("");
+    expect(query.ignoreCase).toBe(false);
+  });
+
+  it("case-sensitive, whole-word, regex search, global", () => {
+    const query = buildQuery(
+      "hi.*",
+      {
+        caseSensitive: true,
+        wholeWord: true,
+        regexMatch: true,
+      },
+      { isGlobal: true }
+    );
+
+    expect(query.source).toBe("\\bhi.*\\b");
+    expect(query.flags).toBe("g");
+    expect(query.ignoreCase).toBe(false);
+  });
+
+  it("case-insensitive, non-whole, string search", () => {
+    const query = buildQuery(
+      "hi",
+      {
+        caseSensitive: false,
+        wholeWord: false,
+        regexMatch: false,
+      },
+      {}
+    );
+
+    expect(query.source).toBe("hi");
+    expect(query.flags).toBe("i");
+    expect(query.ignoreCase).toBe(true);
+  });
+
+  it("case-insensitive, non-whole, string search, global", () => {
+    const query = buildQuery(
+      "hi",
+      {
+        caseSensitive: false,
+        wholeWord: false,
+        regexMatch: false,
+      },
+      { isGlobal: true }
+    );
+
+    expect(query.source).toBe("hi");
+    expect(query.flags).toBe("gi");
+    expect(query.ignoreCase).toBe(true);
+  });
+
+  it("case-sensitive string search", () => {
+    const query = buildQuery(
+      "hi",
+      {
+        caseSensitive: true,
+        wholeWord: false,
+        regexMatch: false,
+      },
+      {}
+    );
+
+    expect(query.source).toBe("hi");
+    expect(query.flags).toBe("");
+    expect(query.ignoreCase).toBe(false);
+  });
+
+  it("string search with wholeWord", () => {
+    const query = buildQuery(
+      "hi",
+      {
+        caseSensitive: false,
+        wholeWord: true,
+        regexMatch: false,
+      },
+      {}
+    );
+
+    expect(query.source).toBe("\\bhi\\b");
+    expect(query.flags).toBe("i");
+    expect(query.ignoreCase).toBe(true);
+  });
+
+  it("case-insensitive, regex search", () => {
+    const query = buildQuery(
+      "hi.*",
+      {
+        caseSensitive: false,
+        wholeWord: false,
+        regexMatch: true,
+      },
+      {}
+    );
+
+    expect(query.source).toBe("hi.*");
+    expect(query.flags).toBe("i");
+    expect(query.global).toBe(false);
+    expect(query.ignoreCase).toBe(true);
+  });
+
+  it("string search with wholeWord and case sensitivity", () => {
+    const query = buildQuery(
+      "hi",
+      {
+        caseSensitive: true,
+        wholeWord: true,
+        regexMatch: false,
+      },
+      {}
+    );
+
+    expect(query.source).toBe("\\bhi\\b");
+    expect(query.flags).toBe("");
+    expect(query.global).toBe(false);
+    expect(query.ignoreCase).toBe(false);
+  });
+
+  it("string search with wholeWord and case sensitivity, global", () => {
+    const query = buildQuery(
+      "hi",
+      {
+        caseSensitive: true,
+        wholeWord: true,
+        regexMatch: false,
+      },
+      { isGlobal: true }
+    );
+
+    expect(query.source).toBe("\\bhi\\b");
+    expect(query.flags).toBe("g");
+    expect(query.global).toBe(true);
+    expect(query.ignoreCase).toBe(false);
+  });
+
+  it("string search with regex chars escaped", () => {
+    const query = buildQuery(
+      "hi.*",
+      {
+        caseSensitive: true,
+        wholeWord: true,
+        regexMatch: false,
+      },
+      {}
+    );
+
+    expect(query.source).toBe("\\bhi\\.\\*\\b");
+    expect(query.flags).toBe("");
+    expect(query.global).toBe(false);
+    expect(query.ignoreCase).toBe(false);
+  });
+
+  it("string search with regex chars escaped, global", () => {
+    const query = buildQuery(
+      "hi.*",
+      {
+        caseSensitive: true,
+        wholeWord: true,
+        regexMatch: false,
+      },
+      { isGlobal: true }
+    );
+
+    expect(query.source).toBe("\\bhi\\.\\*\\b");
+    expect(query.flags).toBe("g");
+    expect(query.global).toBe(true);
+    expect(query.ignoreCase).toBe(false);
+  });
+
+  it("ignore spaces w/o spaces", () => {
+    const query = buildQuery(
+      "hi",
+      {
+        caseSensitive: true,
+        wholeWord: false,
+        regexMatch: false,
+      },
+      { ignoreSpaces: true }
+    );
+
+    expect(query.source).toBe("hi");
+    expect(query.flags).toBe("");
+    expect(query.global).toBe(false);
+    expect(query.ignoreCase).toBe(false);
+  });
+
+  it("ignore spaces w/o spaces, global", () => {
+    const query = buildQuery(
+      "hi",
+      {
+        caseSensitive: true,
+        wholeWord: false,
+        regexMatch: false,
+      },
+      { isGlobal: true, ignoreSpaces: true }
+    );
+
+    expect(query.source).toBe("hi");
+    expect(query.flags).toBe("g");
+    expect(query.global).toBe(true);
+    expect(query.ignoreCase).toBe(false);
+  });
+
+  it("ignore spaces w/ spaces", () => {
+    const query = buildQuery(
+      "  ",
+      {
+        caseSensitive: true,
+        wholeWord: false,
+        regexMatch: false,
+      },
+      { ignoreSpaces: true }
+    );
+
+    expect(query.source).toBe("(?!\\s*.*)");
+    expect(query.flags).toBe("");
+    expect(query.global).toBe(false);
+    expect(query.ignoreCase).toBe(false);
+  });
+
+  it("ignore spaces w/ spaces, global", () => {
+    const query = buildQuery(
+      "  ",
+      {
+        caseSensitive: true,
+        wholeWord: false,
+        regexMatch: false,
+      },
+      { isGlobal: true, ignoreSpaces: true }
+    );
+
+    expect(query.source).toBe("(?!\\s*.*)");
+    expect(query.flags).toBe("g");
+    expect(query.global).toBe(true);
+    expect(query.ignoreCase).toBe(false);
+  });
+});