1 files changed, 96 insertions, 0 deletions
diff --git a/devtools/client/debugger/src/utils/tests/wasm.spec.js b/devtools/client/debugger/src/utils/tests/wasm.spec.js
new file mode 100644
index 0000000000..e803393c12
--- /dev/null
+++ b/devtools/client/debugger/src/utils/tests/wasm.spec.js
@@ -0,0 +1,96 @@
+/* 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 {
+  isWasm,
+  lineToWasmOffset,
+  wasmOffsetToLine,
+  clearWasmStates,
+  renderWasmText,
+} from "../wasm.js";
+
+import { makeMockWasmSourceWithContent } from "../test-mockup";
+
+describe("wasm", () => {
+  // Compiled version of `(module (func (nop)))`
+  const SIMPLE_WASM = {
+    binary:
+      "\x00asm\x01\x00\x00\x00\x01\x84\x80\x80\x80\x00\x01`\x00\x00" +
+      "\x03\x82\x80\x80\x80\x00\x01\x00\x06\x81\x80\x80\x80\x00\x00" +
+      "\n\x89\x80\x80\x80\x00\x01\x83\x80\x80\x80\x00\x00\x01\v",
+  };
+
+  // malformed binary which contains an unknown operator (\x09) which
+  // should cause the wasm parser to throw.
+  const MALFORMED_SIMPLE_WASM = {
+    binary:
+      "\x00asm\x01\x00\x00\x00\x09\x84\x80\x80\x80\x00\x01`\x00\x00" +
+      "\x03\x82\x80\x80\x80\x00\x01\x00\x06\x81\x80\x80\x80\x00\x00" +
+      "\n\x89\x80\x80\x80\x00\x01\x83\x80\x80\x80\x00\x00\x01\v",
+  };
+
+  const SIMPLE_WASM_TEXT = `(module
+  (func $func0
+    nop
+  )
+)`;
+  const SIMPLE_WASM_NOP_TEXT_LINE = 2;
+  const SIMPLE_WASM_NOP_OFFSET = 46;
+
+  describe("isWasm", () => {
+    it("should give us the false when wasm text was not registered", () => {
+      const sourceId = "source.0";
+      expect(isWasm(sourceId)).toEqual(false);
+    });
+    it("should give us the true when wasm text was registered", () => {
+      const source = makeMockWasmSourceWithContent(SIMPLE_WASM);
+      renderWasmText(source.id, source.content.value);
+      expect(isWasm(source.id)).toEqual(true);
+      // clear shall remove
+      clearWasmStates();
+      expect(isWasm(source.id)).toEqual(false);
+    });
+  });
+
+  describe("renderWasmText", () => {
+    it("render simple wasm", () => {
+      const source = makeMockWasmSourceWithContent(SIMPLE_WASM);
+      const lines = renderWasmText(source.id, source.content.value);
+      expect(lines.join("\n")).toEqual(SIMPLE_WASM_TEXT);
+      clearWasmStates();
+    });
+
+    it("should return error information when the parser throws", () => {
+      const source = makeMockWasmSourceWithContent(MALFORMED_SIMPLE_WASM);
+      const lines = renderWasmText(source.id, source.content.value);
+      expect(lines.join("\n")).toEqual(
+        "Error occured during wast conversion : Unknown operator: 6"
+      );
+      clearWasmStates();
+    });
+  });
+
+  describe("lineToWasmOffset", () => {
+    // Test data sanity check: checking if 'nop' is found in the SIMPLE_WASM.
+    expect(SIMPLE_WASM.binary[SIMPLE_WASM_NOP_OFFSET]).toEqual("\x01");
+
+    it("get simple wasm nop offset", () => {
+      const source = makeMockWasmSourceWithContent(SIMPLE_WASM);
+      renderWasmText(source.id, source.content.value);
+      const offset = lineToWasmOffset(source.id, SIMPLE_WASM_NOP_TEXT_LINE);
+      expect(offset).toEqual(SIMPLE_WASM_NOP_OFFSET);
+      clearWasmStates();
+    });
+  });
+
+  describe("wasmOffsetToLine", () => {
+    it("get simple wasm nop line", () => {
+      const source = makeMockWasmSourceWithContent(SIMPLE_WASM);
+      renderWasmText(source.id, source.content.value);
+      const line = wasmOffsetToLine(source.id, SIMPLE_WASM_NOP_OFFSET);
+      expect(line).toEqual(SIMPLE_WASM_NOP_TEXT_LINE);
+      clearWasmStates();
+    });
+  });
+});