diff --git a/tests/format/flow/import/__snapshots__/jsfmt.spec.js.snap b/tests/format/flow/import/__snapshots__/jsfmt.spec.js.snap
new file mode 100644
index 000000000000..18f52fe31bb5
--- /dev/null
+++ b/tests/format/flow/import/__snapshots__/jsfmt.spec.js.snap
@@ -0,0 +1,35 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`import-as-as.js format 1`] = `
+====================================options=====================================
+parsers: ["flow"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+// @flow
+import { foo as as } from "foo";
+import { as as as } from "foo";
+import { as as foo } from "foo";
+
+=====================================output=====================================
+// @flow
+import { foo as as } from "foo";
+import { as as as } from "foo";
+import { as as foo } from "foo";
+
+================================================================================
+`;
+
+exports[`type-import-as-as.js format 1`] = `
+====================================options=====================================
+parsers: ["flow"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+import {type foo as as} from "foo";
+
+=====================================output=====================================
+import { type foo as as } from "foo";
+
+================================================================================
+`;
diff --git a/tests/format/flow/import/import-as-as.js b/tests/format/flow/import/import-as-as.js
new file mode 100644
index 000000000000..5f3bb61851f8
--- /dev/null
+++ b/tests/format/flow/import/import-as-as.js
@@ -0,0 +1,4 @@
+// @flow
+import { foo as as } from "foo";
+import { as as as } from "foo";
+import { as as foo } from "foo";
diff --git a/tests/format/flow/import/jsfmt.spec.js b/tests/format/flow/import/jsfmt.spec.js
new file mode 100644
index 000000000000..b9a908981a50
--- /dev/null
+++ b/tests/format/flow/import/jsfmt.spec.js
@@ -0,0 +1 @@
+run_spec(__dirname, ["flow"]);
diff --git a/tests/format/flow/import/type-import-as-as.js b/tests/format/flow/import/type-import-as-as.js
new file mode 100644
index 000000000000..4c047ef9e33c
--- /dev/null
+++ b/tests/format/flow/import/type-import-as-as.js
@@ -0,0 +1 @@
+import {type foo as as} from "foo";
diff --git a/tests/format/flow/ternary/__snapshots__/jsfmt.spec.js.snap b/tests/format/flow/ternary/__snapshots__/jsfmt.spec.js.snap
new file mode 100644
index 000000000000..8cc73dc36614
--- /dev/null
+++ b/tests/format/flow/ternary/__snapshots__/jsfmt.spec.js.snap
@@ -0,0 +1,60 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`arrows.js [babel-flow] format 1`] = `
+====================================options=====================================
+parsers: ["flow", "babel-flow"]
+printWidth: 80
+                                                                                | printWidth
+=====================================input======================================
+// Test cases from babel
+//   ref: https://github.com/babel/babel/blob/614b48678095746b83bbe517c4d6b30ba8cd5c04/packages/babel-parser/test/fixtures/flow/arrows-in-ternaries/issue-13644/input.js
+// \`flow\` cannot parse below codes
+//   ref: https://github.com/facebook/flow/issues/8731
+
+(a ? (b = c) : d => e); // a ? (b = c) : (d => e)
+(a ? (b += c) : d => e); // a ? (b += c) : (d => e)
+
+(a ? (b = c) : d => e : f); // a ? ((b = c): d => e) : f
+(a ? (b += c) : d => e : f); // ((a ? (b += c) : (d => e)) : f)
+
+(a ? b => (c = d) : e => f); // a ? (b => (c = d)) : (e => f)
+(a ? b => (c += d) : e => f); // a ? (b => (c += d)) : (e => f)
+
+(a ? b => (c = d) : e => f : g); // a ? (b => ((c = d): e => f)) : g
+(a ? b => (c += d) : e => f : g); // ((a ? (b => (c += d)) : (e => f)) : g)
+
+=====================================output=====================================
+// Test cases from babel
+//   ref: https://github.com/babel/babel/blob/614b48678095746b83bbe517c4d6b30ba8cd5c04/packages/babel-parser/test/fixtures/flow/arrows-in-ternaries/issue-13644/input.js
+// \`flow\` cannot parse below codes
+//   ref: https://github.com/facebook/flow/issues/8731
+
+a ? (b = c) : (d) => e; // a ? (b = c) : (d => e)
+a ? (b += c) : (d) => e; // a ? (b += c) : (d => e)
+
+a ? (b = c): d => e : f; // a ? ((b = c): d => e) : f
+((a ? (b += c) : (d) => e): f); // ((a ? (b += c) : (d => e)) : f)
+
+a ? (b) => (c = d) : (e) => f; // a ? (b => (c = d)) : (e => f)
+a ? (b) => (c += d) : (e) => f; // a ? (b => (c += d)) : (e => f)
+
+a
+  ? (b) =>
+      (c = d): e =>
+        f
+  : g; // a ? (b => ((c = d): e => f)) : g
+((a ? (b) => (c += d) : (e) => f): g); // ((a ? (b => (c += d)) : (e => f)) : g)
+
+================================================================================
+`;
+
+exports[`arrows.js [flow] format 1`] = `
+"Unexpected token \`)\`, expected the token \`:\` (6:22)
+  4 | //   ref: https://github.com/facebook/flow/issues/8731
+  5 |
+> 6 | (a ? (b = c) : d => e); // a ? (b = c) : (d => e)
+    |                      ^
+  7 | (a ? (b += c) : d => e); // a ? (b += c) : (d => e)
+  8 |
+  9 | (a ? (b = c) : d => e : f); // a ? ((b = c): d => e) : f"
+`;
diff --git a/tests/format/flow/ternary/arrows.js b/tests/format/flow/ternary/arrows.js
new file mode 100644
index 000000000000..12b301f02b98
--- /dev/null
+++ b/tests/format/flow/ternary/arrows.js
@@ -0,0 +1,16 @@
+// Test cases from babel
+//   ref: https://github.com/babel/babel/blob/614b48678095746b83bbe517c4d6b30ba8cd5c04/packages/babel-parser/test/fixtures/flow/arrows-in-ternaries/issue-13644/input.js
+// `flow` cannot parse below codes
+//   ref: https://github.com/facebook/flow/issues/8731
+
+(a ? (b = c) : d => e); // a ? (b = c) : (d => e)
+(a ? (b += c) : d => e); // a ? (b += c) : (d => e)
+
+(a ? (b = c) : d => e : f); // a ? ((b = c): d => e) : f
+(a ? (b += c) : d => e : f); // ((a ? (b += c) : (d => e)) : f)
+
+(a ? b => (c = d) : e => f); // a ? (b => (c = d)) : (e => f)
+(a ? b => (c += d) : e => f); // a ? (b => (c += d)) : (e => f)
+
+(a ? b => (c = d) : e => f : g); // a ? (b => ((c = d): e => f)) : g
+(a ? b => (c += d) : e => f : g); // ((a ? (b => (c += d)) : (e => f)) : g)
diff --git a/tests/format/flow/ternary/jsfmt.spec.js b/tests/format/flow/ternary/jsfmt.spec.js
new file mode 100644
index 000000000000..824dde386563
--- /dev/null
+++ b/tests/format/flow/ternary/jsfmt.spec.js
@@ -0,0 +1,3 @@
+run_spec(__dirname, ["flow", "babel-flow"], {
+  errors: { flow: ["arrows.js"] },
+});
diff --git a/tests/format/misc/errors/babel-flow/__snapshots__/jsfmt.spec.js.snap b/tests/format/misc/errors/babel-flow/__snapshots__/jsfmt.spec.js.snap
index 770a98581a6e..f3a74f0d3dd0 100644
--- a/tests/format/misc/errors/babel-flow/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/format/misc/errors/babel-flow/__snapshots__/jsfmt.spec.js.snap
@@ -17,3 +17,17 @@ exports[`async-arrow-invalid.js [babel-flow] format 1`] = `
     | ^
   4 |"
 `;
+
+exports[`wrong-arrow-no-parens-jsx.js [babel] format 1`] = `
+"Unterminated JSX contents. (1:4)
+> 1 | <T>(a => b);
+    |    ^
+  2 |"
+`;
+
+exports[`wrong-arrow-no-parens-jsx.js [babel-flow] format 1`] = `
+"Unterminated JSX contents. (1:4)
+> 1 | <T>(a => b);
+    |    ^
+  2 |"
+`;
diff --git a/tests/format/misc/errors/babel-flow/wrong-arrow-no-parens-jsx.js b/tests/format/misc/errors/babel-flow/wrong-arrow-no-parens-jsx.js
new file mode 100644
index 000000000000..11885587667e
--- /dev/null
+++ b/tests/format/misc/errors/babel-flow/wrong-arrow-no-parens-jsx.js
@@ -0,0 +1 @@
+<T>(a => b);