unnoisy the tests

src/commands/common.zig

@@ -1,4 +1,5 @@
 const std = @import("std");
+const builtin = @import("builtin");
 const zfin = @import("../root.zig");
 const srf = @import("srf");
 const history = @import("../history.zig");
@@ -109,6 +110,10 @@ pub fn printGainLoss(
 // ── Stderr helpers ───────────────────────────────────────────
 
 pub fn stderrPrint(msg: []const u8) !void {
+    // Under `zig build test` these messages are just noise — tests
+    // that exercise error paths emit the same usage/hint strings on
+    // every run. Real CLI users always reach the real stderr.
+    if (builtin.is_test) return;
     var buf: [1024]u8 = undefined;
     var writer = std.fs.File.stderr().writer(&buf);
     const out = &writer.interface;
@@ -118,6 +123,7 @@ pub fn stderrPrint(msg: []const u8) !void {
 
 /// Print progress line to stderr: "  [N/M] SYMBOL (status)"
 pub fn stderrProgress(symbol: []const u8, status: []const u8, current: usize, total: usize, color: bool) !void {
+    if (builtin.is_test) return;
     var buf: [256]u8 = undefined;
     var writer = std.fs.File.stderr().writer(&buf);
     const out = &writer.interface;
@@ -133,6 +139,7 @@ pub fn stderrProgress(symbol: []const u8, status: []const u8, current: usize, to
 
 /// Print rate-limit wait message to stderr
 pub fn stderrRateLimitWait(wait_seconds: u64, color: bool) !void {
+    if (builtin.is_test) return;
     var buf: [256]u8 = undefined;
     var writer = std.fs.File.stderr().writer(&buf);
     const out = &writer.interface;

src/history.zig

@@ -30,6 +30,7 @@
 //! all go through here). The command module stays a thin CLI wrapper.
 
 const std = @import("std");
+const builtin = @import("builtin");
 const srf = @import("srf");
 const snapshot = @import("models/snapshot.zig");
 const Date = @import("models/date.zig").Date;
@@ -202,7 +203,12 @@ pub fn loadHistoryDir(
         // `bytes` is freed either by LoadedHistory.deinit on success or
         // by the branch below on parse failure — no defer-free here.
         const snap = parseSnapshotBytes(allocator, bytes) catch |err| {
-            std.log.warn("history: failed to parse {s}: {s}", .{ full_path, @errorName(err) });
+            // Tests intentionally feed malformed snapshots to exercise
+            // the error path — suppress the warn under `zig build test`
+            // so real parse failures stay visible in production runs.
+            if (!builtin.is_test) {
+                std.log.warn("history: failed to parse {s}: {s}", .{ full_path, @errorName(err) });
+            }
             allocator.free(bytes);
             continue;
         };

src/models/transaction_log.zig

@@ -55,6 +55,7 @@
 //! `src/commands/contributions.zig` for the classifier integration.
 
 const std = @import("std");
+const builtin = @import("builtin");
 const srf = @import("srf");
 const Date = @import("date.zig").Date;
 
@@ -239,7 +240,11 @@ pub fn parseTransactionLogFile(
 
     while (try it.next()) |fields| {
         const parsed = fields.to(TransferRecord) catch |err| {
-            logger.warn("skipping malformed transfer record: {s}", .{@errorName(err)});
+            // Tests intentionally feed malformed records to exercise the
+            // skip path; real parse failures stay visible outside tests.
+            if (!builtin.is_test) {
+                logger.warn("skipping malformed transfer record: {s}", .{@errorName(err)});
+            }
             continue;
         };
         // String fields on `parsed` point into the iterator's internal

src/service.zig

@@ -8,6 +8,7 @@
 //! based on available API keys. Callers never need to know which provider was used.
 
 const std = @import("std");
+const builtin = @import("builtin");
 const log = std.log.scoped(.service);
 
 const Date = @import("models/date.zig").Date;
@@ -171,7 +172,10 @@ pub const DataService = struct {
             .thread_safe = .{ .child_allocator = base_allocator },
             .config = config,
         };
-        self.logMissingKeys();
+        // Missing-key warnings are noise under `zig build test` where
+        // every test that spins up a DataService re-emits the whole
+        // block. Real users always see them at CLI/TUI startup.
+        if (!builtin.is_test) self.logMissingKeys();
         return self;
     }